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3. Unsupervised image velocimetry for automated computation of river flow velocities.

Author

Perks, Matthew, Hortobágyi, Borbála, Everard, Nick, Manson, Susan, Rowland, Juliet, Large, Andrew, and Russell, Andrew

Abstract

Accurate, long-term, measurements of river flow are imperative for understanding and predicting a broad range of fluvial processes. Modern technological advances are enabling the development of new solutions that are tailored to manage water resources and hazards in a variety of flow regimes. This study appraises the potential of freely available image velocimetry software (KLT-IV) to provide automatic determination of river surface velocity in an unsupervised workflow. In this research, over 11,000 videos are analysed, and these are compared with 1-D velocities derived from 303 flow gauging measurements obtained using standard operating procedures. This analysis was undertaken at a complex monitoring site with a partial view of the channel with river flows spanning nearly two orders of magnitude. Following image velocimetry analysis, two differing approaches are adopted to produce outputs that are representative of the depth-averaged and cross-section averaged flow velocities. These approaches include the utilisation of theoretical flow field distributions to extrapolate beyond the field of view, and an index-velocity approach to relate the image-based velocities to a section averaged (1-D) velocity. Analysis of the section-averaged velocities obtained using KLT-IV, compared to traditional flow gauging, yields highly significant linear relationships (r2 = 0.95–0.97). Similarly, the index-velocity approach enables KLT-IV surface velocities to be precisely related to the section-averaged velocity measurements (r2 = 0.98). These data are subsequently used to estimate river flow discharge. When compared to reference flow gauging data, r2 values of 0.98 to 0.99 are obtained (for a linear model with intercept of 0 and slope of 1). KLT-IV offers an attractive approach for conducting unsupervised flow velocity measurements in an operational environment where autonomy is of paramount importance. [ABSTRACT FROM AUTHOR]

Published
2025
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6. How quickly does wood fragment in rivers? Methodological challenges, preliminary findings, and perspectives.

Author

Hortobágyi, Borbála, Milan, David, Bourgeau, Fanny, and Piégay, Hervé

Subjects
WOOD, RIVER ecology, FLUVIAL geomorphology, WATERSHEDS, POINT cloud
Abstract

Large wood plays a significant role in fluvial ecosystems, influencing river geomorphology and ecology. However, it poses both benefits to river systems and risks, making it essential to understand its dynamics for effective management. A better understanding the wood breakdown process is required to evaluate the flood risk of wood in rivers. This paper aims to evaluate early‐stage fragmentation of wood in rivers after being recruited through bank erosion, taking into account its mobility and residence time. Two methods for characterising and monitoring wood fragmentation are suggested and compared: 1) photo‐interpretation based on ground and drone photo and 2) terrestrial LiDAR. We used Quantitative Structure Modelling (QSM) of point clouds to accurately simulate the full branching structure of trees. Close relationships exist between photo‐interpreted and LiDAR‐derived complexity metrics, but a scaled parameter (i.e., diameter) is needed to correlate branching complexity with volume. The debranching process occurs quickly, with a median reduction in branching complexity of over 80% within the initial 2 years. Further research with a larger sample size is necessary to investigate the impact of context – including transportation, submersion, accumulation, and isolation of wood pieces – on the fragmentation process. Field observations indicate that immobile wood pieces can experience a rapid reduction in their branching complexity, similar to the ones that are transported. Partial fine branching structure can be maintained on transported pieces. Both photo‐interpretation and terrestrial LiDAR offer complimentary approaches to monitoring wood fragmentation. Photo‐interpretation is easily implementable and may be used as a proxy for mechanical fragmentation, while terrestrial LiDAR may be used to monitor 3D wood fragmentation, volume and length evolution, following QSM modelling. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Inter‐basin comparison of wood flux using random forest modelling and repeated wood extractions in unmonitored catchments.

Author

Hortobágyi, Borbála, Vaudor, Lise, Ghaffarian, Hossein, and Piégay, Hervé

Subjects
WOOD, RANDOM forest algorithms, ECOLOGICAL risk assessment, WATERSHED management, EQUILIBRIUM testing, WATERSHEDS
Abstract

Predicting wood flux (i.e., wood piece number per time interval) or discharge (metre cubes of wood per second) in rivers is crucial for adequate integrated river management that balances risk assessment and ecological improvement. To enhance our understanding of the transport mechanisms of wood and assess their effects in various geographical contexts, it is necessary to conduct inter‐basin comparative studies and preliminary modelling. The wood flux of two river basins was analysed using video monitoring and random forest predictions based on hydrological drivers. The wood flux dynamics of the Ain and Allier rivers were both compared and contrasted. Although there was shared wood transport hysteresis, hourly wood flux, relative critical flow discharges of wood transport and certain hydrological factors exhibited differences between the two river basins. As a next step, the two random forest models, which were trained previously, were applied to predict wood flux and then wood discharge in a third river (the Rhône), in order to estimate a wood volume export, which can be compared with the wood volumes extracted over a series of a few monthly periods in the Génissiat reservoir. By using the random forest modelling, it is possible to estimate the volume of wood on the Rhône river. Despite the absence of any training data, there is a noticeable correlation, however, the estimated volumes were significantly overestimated. To resolve this issue, a correction factor was applied, accounting for disparities in wood recruitment dynamics between the Rhône basin and the training river basins. It was found that high flow events are underestimated, emphasizing the importance of incorporating local annotations and additional parameters in training the random forest model. Accurately predicting wood flux is important for integrated watershed management, but field observations are still lacking for validation and process‐based understanding. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Spatio-temporal dynamics of driftwood in the alluvial plain of the Allier Valley (France)

Author

Hortobágyi, Borbála, Petit, Stéphane, Melun, Gabriel, Le Roux, Guillaume, Thauvin, Frédéric, Piégay, Hervé, Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SHS]Humanities and Social Sciences
Published
2022

14. Linking wood flux video monitoring and semi-controlled experiment of downstream wood diffusion to better understand wood transport

Author

Hortobágyi, Borbála, Petit, Stéphane, Melun, Gabriel, Le Roux, Guillaume, Thauvin, Frédéric, Piégay, Hervé, Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SHS]Humanities and Social Sciences
Published
2022

15. Identification of floodwater source areas in Nepal using SCIMAP‐Flood

Author

Pearson, C. J., Reaney, S, Perks, M. T., Hortobágyi, Borbála, Rosser, N. J., Large, A, Large, A. R. G., Durham University, Newcastle University [Newcastle], Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
spatial targeting, Environmental Engineering, decision support, flood mitigation, Geography, Planning and Development, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, catchment-scale, [SHS.GEO]Humanities and Social Sciences/Geography, Safety, Risk, Reliability and Quality, [SDE.ES]Environmental Sciences/Environmental and Society, Water Science and Technology, critical source areas, SCIMAP-Flood
Abstract

Practical approaches for managing flooding from fluvial sources are moving away from mitigation solely at the point of impact and towards integrated catchment management. This considers the source areas, flow pathways of floodwaters and the locations and exposure to the risk of communities. For a field site in southern Nepal, we analyse catchment response to a range of simulated rainfall events, which when evaluated collectively can help guide potential flood management solutions. This is achieved through the adoption of SCIMAP-Flood, a decision support framework that works at the catchment-scale to identify critical source areas for floodwaters. The SCIMAP-Flood Fitted inverse modelling approach has been applied to the East Rapti catchment, Nepal. For multiple flood impact locations throughout the catchment, SCIMAP-Flood effectively identifies locations where flood management measures would have the most positive effects on risk reduction. The results show that the spatial targeting of mitigation measures in areas of irrigated and rainfed agriculture and the prevention of deforestation or removal of shrubland would be the most effective approaches. If these actions were in the upper catchment above Hetauda or upstream of Manahari they would have the most effective reduction in the flood peak.

Published
2022
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16. Towards harmonisation of image velocimetry techniques for river surface velocity observations

Author

Perks, Matthew T., primary, Dal Sasso, Silvano Fortunato, additional, Hauet, Alexandre, additional, Jamieson, Elizabeth, additional, Le Coz, Jérôme, additional, Pearce, Sophie, additional, Peña-Haro, Salvador, additional, Pizarro, Alonso, additional, Strelnikova, Dariia, additional, Tauro, Flavia, additional, Bomhof, James, additional, Grimaldi, Salvatore, additional, Goulet, Alain, additional, Hortobágyi, Borbála, additional, Jodeau, Magali, additional, Käfer, Sabine, additional, Ljubičić, Robert, additional, Maddock, Ian, additional, Mayr, Peter, additional, Paulus, Gernot, additional, Pénard, Lionel, additional, Sinclair, Leigh, additional, and Manfreda, Salvatore, additional

Published
2020
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17. Towards harmonisation of image velocimetry techniques for river surface velocity observations

Author

Perks, Matthew T., Dal Sasso, Silvano Fortunato, Hauet, Alexandre, Jamieson, Elizabeth, Le Coz, Jérôme, Pearce, Sophie, Peña-Haro, Salvador, Pizarro, Alonso, Strelnikova, Dariia, Tauro, Flavia, Bomhof, James, Grimaldi, Salvatore, Goulet, Alain, Hortobágyi, Borbála, Jodeau, Magali, Käfer, Sabine, Ljubičić, Robert, Maddock, Ian, Mayr, Peter, Paulus, Gernot, Pénard, Lionel, Sinclair, Leigh, Manfreda, Salvatore, Perks, Matthew T., Dal Sasso, Silvano Fortunato, Hauet, Alexandre, Jamieson, Elizabeth, Le Coz, Jérôme, Pearce, Sophie, Peña-Haro, Salvador, Pizarro, Alonso, Strelnikova, Dariia, Tauro, Flavia, Bomhof, James, Grimaldi, Salvatore, Goulet, Alain, Hortobágyi, Borbála, Jodeau, Magali, Käfer, Sabine, Ljubičić, Robert, Maddock, Ian, Mayr, Peter, Paulus, Gernot, Pénard, Lionel, Sinclair, Leigh, and Manfreda, Salvatore

Abstract

Since the turn of the 21st century, image-based velocimetry techniques have become an increasingly popular approach for determining open-channel flow in a range of hydrological settings across Europe and beyond. Simultaneously, a range of large-scale image velocimetry algorithms have been developed that are equipped with differing image pre-processing and analytical capabilities. Yet in operational hydrometry, these techniques are utilised by few competent authorities. Therefore, imagery collected for image velocimetry analysis (along with reference data) is required both to enable inter-comparisons between these differing approaches and to test their overall efficacy. Through benchmarking exercises, it will be possible to assess which approaches are best suited for a range of fluvial settings, and to focus future software developments. Here we collate and describe datasets acquired from seven countries across Europe and North America, consisting of videos that have been subjected to a range of pre-processing and image velocimetry analyses (Perks et al., 2020, https://doi.org/10.4121/uuid:014d56f7-06dd-49ad-a48c-2282ab10428e). Reference data are available for 12 of the 13 case studies presented, enabling these data to be used for reference and accuracy assessment.

Published
2020

18. Towards harmonization of image velocimetry techniques for river surface velocity observations

Author

Perks, Matthew T., primary, Dal Sasso, Silvano Fortunato, additional, Hauet, Alexandre, additional, Le Coz, Jérôme, additional, Pearce, Sophie, additional, Peña-Haro, Salvador, additional, Tauro, Flavia, additional, Grimaldi, Salvatore, additional, Hortobágyi, Borbála, additional, Jodeau, Magali, additional, Maddock, Ian, additional, Pénard, Lionel, additional, and Manfreda, Salvatore, additional

Published
2019
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19. Multi-scale interactions between riparian vegetation and hydrogeomorphic processes (the lower Allier River)

Author

Hortobágyi, Borbála, GEOLAB S.A., Université Clermont Auvergne [2017-2020], Jean-Luc Peiry, and Dov Corenblit

Subjects
Fluvial biogeomorphology, Rivière Allier, Ecosystem engineer, Biogéomorphologie fluviale, Allier River, Multi-échelles, [SHS.GEO]Humanities and Social Sciences/Geography, Rétroaction, Multi-scale, Ingénieur d’écosystème, Feedback
Abstract

N ecosystems, such as rivers, salt marshes, mangroves, coastal dunes which are exposed to frequent and regular hydrogeomorphic fluxes (i.e. physical disturbances), feedbacks between geomorphology (water, sediment and landforms) and plants (e.g. Populus nigra L., Salix alba L., Salix purpurea L. in rivers) can occur. Vegetation esta¬blishment is controlled by hydrogeomorphic processes which in turn are modulated by vegetation. Such feedbacks control riparian ecosystem dynamics. In this thesis, we addressed two main questions in an effort to better understand feedbacks between riparian vegetation and hydrogeomorphic processes: (i) How does riparian vegetation respond to hydrogeomorphic constraints? (ii) How, and to what extent, do established engineer plants affect fluvial geomorphology? We studied these questions through a nested multi-scale approach from landscape pattern to plant trait scales on the dynamic wandering Allier River (France). We tested the applicability of the method of photogrammetry to quantify the response and the effect of riparian vegetation and biogeomorphic feedbacks at different spatio-temporal scales (i.e. corridor, alluvial bar and individual). At the corridor scale, we searched for the topographic signature of riparian vegetation in the landscape, using photogrammetric and LiDAR data. At the intermediate alluvial bar scale, we investigated the aptitude of three dominant pioneer riparian Salicaceae species (P. nigra, S. purpurea and S. alba) to establish and to act as ecosystem engineers by trap¬ping fine sediment. At the finest, plant trait scale, we quantified the relation between response trait attributes of young P. nigra plants and their exposure to three different levels of mechanical stress (a highly exposed bar-head, a less exposed bar-tail, a chute channel). We identified some difficulties or failures to properly apply photogrammetry in biogeomorphic feedback studies. However, photogrammetry appeared as a useful tool to quantify a set of relevant parameters to respond to fundamental research questions concerning biogeomorphic feedbacks at the three nested spatial scales. At the broadest, the topographic signature of vegetation was not easy to capture because of the complex shifting mosaic of landforms of the Allier River. However, by focusing on more connec¬ted, restricted areas (i.e. alluvial bars), the signature of vegetation could be captured. It seems to increase with increasing vegetation height corresponding to the evolutionary phases of the fluvial biogeomorphic succession (FBS) model. At the intermediate, alluvial bar scale, biogeomorphic feedbacks could be well identified. The capacity of riparian plants to establish and act as ecosystem engineers depended both on species and their physiognomy, their age and their location on alluvial bars. At the finest, individual plant scale, we captured the contrasting morphological and biomechanical response of P. nigra to variable mechanical stress exposure from a trait perspective. In all hierarchical levels, scale-related biogeomorphic feedbacks were detected and described in a conceptual model. The three scales were considered as cycles composed of four different phases, which can have a variable temporality. The broadest spatio-temporal scale represents the evolution over several decades of the landscape mosaic resulting from the balance between constructive (vegetation establishment, growth and succession) and destruc¬tive (floods) forces. [...]; Dans les écosystèmes, tels que les rivières, les marais salés, les mangroves, les dunes côtières, qui sont exposés à des flux hydrogéomorphologiques fréquents et réguliers (c’est-à-dire à des perturbations physiques), des rétroactions se mettent en place entre la géomorphologie (eau, sédiments et formes fluviales) et les plantes (par exemple Populus nigra L., Salix alba L., Salix purpurea L. dans les rivières). L’établissement de la végétation est contrôlé par des processus hydrogéomorphologiques qui, en retour, sont modulés par la végétation. De telles rétroactions contrôlent la dynamique des écosystèmes riverains. Dans cette thèse, nous avons abordé deux questions principales afin de mieux comprendre les rétroactions entre la végétation riveraine et les processus hydrogéomorphologiques : (i) comment la végétation riveraine répond-elle aux contraintes hydrogéomorphologiques ? (ii) comment et dans quelle mesure les plantes ingénieures, une fois établies, affectent-elles la géomorphologie fluviale ? Nous avons étudié ces questions sur la rivière Allier (France) à travers une approche emboîtée multi-échelles allant de l’échelle du patron paysager au trait de plante. Nous avons testé l’applicabilité de la méthode de photogrammétrie pour quantifier la réponse et l’effet de la végétation riveraine et des rétroactions biogéomorphologiques à différentes échelles spatio-temporelles (corridor, banc alluvial et individu). À l’échelle du corridor, nous avons recherché la signature topographique de la végétation riveraine dans le paysage, en utilisant des données photogrammétriques et LiDAR. À l’échelle intermédiaire du banc alluvial, nous avons étudié l’aptitude des trois espèces pionnières dominantes riveraines de Salicaceae (P. nigra, S. purpurea, S. alba) à s’établir et à agir comme ingénieurs d’écosystème en piégeant les sédiments fins. À l’échelle la plus fine du trait de plante, nous avons quantifié la relation existante entre les attributs de trait de réponse des jeunes plantes de P. nigra et leur exposition à trois niveaux différents de stress mécanique (tête de banc fortement exposée, queue de banc moins exposée, chute alluviale). Nous avons identifié les difficultés et les erreurs à ne pas commettre pour appliquer correctement la photogrammétrie dans les études des rétroactions biogéomorphologiques. En tout état de cause, la photogrammétrie s’est avérée être un outil performant pour quantifier un ensemble de paramètres pertinents pour répondre à des questions de recherche fondamentale aux trois échelles spatiales considérées. À l’échelle la plus large, la signature topographique de la végétation est particulièrement difficile à identifier en raison de la dynamique complexe des formes fluviales de la rivière Allier. Cependant, en concentrant les observations sur des zones de taille réduite et fortement connectées (bancs alluviaux bordant le chenal), la signature de la végétation a pu être identifiée par cette méthode. Elle semble augmenter avec la croissance de la hauteur végétale (progression temporelle de la succession biogéomorphologique), ce qui est en accord avec le modèle de succession biogéomorphologique fluviale (SBF). À l’échelle intermédiaire du banc alluvial, les rétroactions biogéomorphologiques pouvaient être bien identifiées. La capacité des plantes riveraines à s’établir et à agir comme ingénieurs d’écosystème dépend à la fois des espèces et de leur physionomie, de leur âge et de leur position respective sur les bancs alluviaux. À l’échelle la plus fine de l’individu, nous avons capturé la réponse morphologique et biomécanique contrastée de P. nigra à l’exposition aux différents niveaux de contrainte mécanique d’un point de vue de trait. Dans tous les niveaux hiérarchiques, des rétroactions biogéomorphologiques liées aux échelles ont été détectées et synthétisées dans un modèle conceptuel. [...]

Published
2018

20. Interactions multi-échelles entre la végétation riveraine et les processus hydrogéomorphologiques (bas-Allier)

Author

Hortobágyi, Borbála, GEOLAB S.A., Université Clermont Auvergne [2017-2020], Jean-Luc Peiry, and Dov Corenblit

Subjects
Fluvial biogeomorphology, Rivière Allier, Ecosystem engineer, Biogéomorphologie fluviale, Allier River, Multi-échelles, [SHS.GEO]Humanities and Social Sciences/Geography, Rétroaction, Multi-scale, Ingénieur d’écosystème, Feedback
Abstract

N ecosystems, such as rivers, salt marshes, mangroves, coastal dunes which are exposed to frequent and regular hydrogeomorphic fluxes (i.e. physical disturbances), feedbacks between geomorphology (water, sediment and landforms) and plants (e.g. Populus nigra L., Salix alba L., Salix purpurea L. in rivers) can occur. Vegetation esta¬blishment is controlled by hydrogeomorphic processes which in turn are modulated by vegetation. Such feedbacks control riparian ecosystem dynamics. In this thesis, we addressed two main questions in an effort to better understand feedbacks between riparian vegetation and hydrogeomorphic processes: (i) How does riparian vegetation respond to hydrogeomorphic constraints? (ii) How, and to what extent, do established engineer plants affect fluvial geomorphology? We studied these questions through a nested multi-scale approach from landscape pattern to plant trait scales on the dynamic wandering Allier River (France). We tested the applicability of the method of photogrammetry to quantify the response and the effect of riparian vegetation and biogeomorphic feedbacks at different spatio-temporal scales (i.e. corridor, alluvial bar and individual). At the corridor scale, we searched for the topographic signature of riparian vegetation in the landscape, using photogrammetric and LiDAR data. At the intermediate alluvial bar scale, we investigated the aptitude of three dominant pioneer riparian Salicaceae species (P. nigra, S. purpurea and S. alba) to establish and to act as ecosystem engineers by trap¬ping fine sediment. At the finest, plant trait scale, we quantified the relation between response trait attributes of young P. nigra plants and their exposure to three different levels of mechanical stress (a highly exposed bar-head, a less exposed bar-tail, a chute channel). We identified some difficulties or failures to properly apply photogrammetry in biogeomorphic feedback studies. However, photogrammetry appeared as a useful tool to quantify a set of relevant parameters to respond to fundamental research questions concerning biogeomorphic feedbacks at the three nested spatial scales. At the broadest, the topographic signature of vegetation was not easy to capture because of the complex shifting mosaic of landforms of the Allier River. However, by focusing on more connec¬ted, restricted areas (i.e. alluvial bars), the signature of vegetation could be captured. It seems to increase with increasing vegetation height corresponding to the evolutionary phases of the fluvial biogeomorphic succession (FBS) model. At the intermediate, alluvial bar scale, biogeomorphic feedbacks could be well identified. The capacity of riparian plants to establish and act as ecosystem engineers depended both on species and their physiognomy, their age and their location on alluvial bars. At the finest, individual plant scale, we captured the contrasting morphological and biomechanical response of P. nigra to variable mechanical stress exposure from a trait perspective. In all hierarchical levels, scale-related biogeomorphic feedbacks were detected and described in a conceptual model. The three scales were considered as cycles composed of four different phases, which can have a variable temporality. The broadest spatio-temporal scale represents the evolution over several decades of the landscape mosaic resulting from the balance between constructive (vegetation establishment, growth and succession) and destruc¬tive (floods) forces. [...]; Dans les écosystèmes, tels que les rivières, les marais salés, les mangroves, les dunes côtières, qui sont exposés à des flux hydrogéomorphologiques fréquents et réguliers (c’est-à-dire à des perturbations physiques), des rétroactions se mettent en place entre la géomorphologie (eau, sédiments et formes fluviales) et les plantes (par exemple Populus nigra L., Salix alba L., Salix purpurea L. dans les rivières). L’établissement de la végétation est contrôlé par des processus hydrogéomorphologiques qui, en retour, sont modulés par la végétation. De telles rétroactions contrôlent la dynamique des écosystèmes riverains. Dans cette thèse, nous avons abordé deux questions principales afin de mieux comprendre les rétroactions entre la végétation riveraine et les processus hydrogéomorphologiques : (i) comment la végétation riveraine répond-elle aux contraintes hydrogéomorphologiques ? (ii) comment et dans quelle mesure les plantes ingénieures, une fois établies, affectent-elles la géomorphologie fluviale ? Nous avons étudié ces questions sur la rivière Allier (France) à travers une approche emboîtée multi-échelles allant de l’échelle du patron paysager au trait de plante. Nous avons testé l’applicabilité de la méthode de photogrammétrie pour quantifier la réponse et l’effet de la végétation riveraine et des rétroactions biogéomorphologiques à différentes échelles spatio-temporelles (corridor, banc alluvial et individu). À l’échelle du corridor, nous avons recherché la signature topographique de la végétation riveraine dans le paysage, en utilisant des données photogrammétriques et LiDAR. À l’échelle intermédiaire du banc alluvial, nous avons étudié l’aptitude des trois espèces pionnières dominantes riveraines de Salicaceae (P. nigra, S. purpurea, S. alba) à s’établir et à agir comme ingénieurs d’écosystème en piégeant les sédiments fins. À l’échelle la plus fine du trait de plante, nous avons quantifié la relation existante entre les attributs de trait de réponse des jeunes plantes de P. nigra et leur exposition à trois niveaux différents de stress mécanique (tête de banc fortement exposée, queue de banc moins exposée, chute alluviale). Nous avons identifié les difficultés et les erreurs à ne pas commettre pour appliquer correctement la photogrammétrie dans les études des rétroactions biogéomorphologiques. En tout état de cause, la photogrammétrie s’est avérée être un outil performant pour quantifier un ensemble de paramètres pertinents pour répondre à des questions de recherche fondamentale aux trois échelles spatiales considérées. À l’échelle la plus large, la signature topographique de la végétation est particulièrement difficile à identifier en raison de la dynamique complexe des formes fluviales de la rivière Allier. Cependant, en concentrant les observations sur des zones de taille réduite et fortement connectées (bancs alluviaux bordant le chenal), la signature de la végétation a pu être identifiée par cette méthode. Elle semble augmenter avec la croissance de la hauteur végétale (progression temporelle de la succession biogéomorphologique), ce qui est en accord avec le modèle de succession biogéomorphologique fluviale (SBF). À l’échelle intermédiaire du banc alluvial, les rétroactions biogéomorphologiques pouvaient être bien identifiées. La capacité des plantes riveraines à s’établir et à agir comme ingénieurs d’écosystème dépend à la fois des espèces et de leur physionomie, de leur âge et de leur position respective sur les bancs alluviaux. À l’échelle la plus fine de l’individu, nous avons capturé la réponse morphologique et biomécanique contrastée de P. nigra à l’exposition aux différents niveaux de contrainte mécanique d’un point de vue de trait. Dans tous les niveaux hiérarchiques, des rétroactions biogéomorphologiques liées aux échelles ont été détectées et synthétisées dans un modèle conceptuel. [...]

Published
2018

21. Establishment area and biogeomorphic feedback window of three pioneer riparian Salicaceae species within a dynamic riparian corridor (Allier River, France)

Author

Hortobágyi, Borbála, Corenblit, Dov Jean-François, Steiger, Johannes, Peiry, Jean-Luc, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and Steiger, Johannes

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SHS.GEO] Humanities and Social Sciences/Geography, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

22. Use of photogrammetry for the study of riparian vegetation dynamics

Author

Hortobágyi, Borbála, Vautier, Franck, Burkart, Andreas, Wrobel, Thomas Jan, Peiry, Jean-Luc, Steiger, Johannes, Corenblit, Dov Jean-François, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Institute für Bio- und Geowissenschaften, Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Institute of Plant Biochemistry, Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf], Hortobágyi, Borbála, Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
[SDE] Environmental Sciences, [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology, vegetation height model, aerial photographs, [SHS.GEO] Humanities and Social Sciences/Geography, UAV, [SDE]Environmental Sciences, riparian vegetation, [SHS] Humanities and Social Sciences, [SHS.GEO]Humanities and Social Sciences/Geography, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, photogrammetry, [SHS]Humanities and Social Sciences
Abstract

This study presents the results of methodological tests in aerial photogrammetry with the objective of a diachronic survey of riparian vegetation in three dimensions, i.e. its spatial distribution and height. The study is undertaken at two complementary scales. The first one corresponds to a 10 km reach of the Allier river floodplain. At this scale, aerial photographs were taken from a small airplane. The second level of analysis corresponds to a wooded point bar located within the 10 km reach. At this scale, the photographs were taken from an unmanned aerial vehicle (UAV). Canopy height models (CHM) are produced at two scales of analysis. The accuracy of the CHMs is then analysed by comparison with vegetation height measurements collected during a filed campaign. The results show significant agreement for the models derived from two approaches, with an error of one meter at the floodplain scale and few centimetres at the bar scale. This variation in error is mainly due to different photographic resolutions. The two approaches appeared to be complementary. The first one is adequate for mapping vegetation structure at the floodplain scale, the second for mapping vegetation in smaller areas but at a higher resolution., Cette étude présente les résultats de tests méthodologiques réalisés en photogrammétrie aérienne avec pour objectif le suivi diachronique de la végétation riveraine dans ses trois dimensions, c’est-à-dire sa distribution spatiale et sa hauteur. L’étude est menée à deux échelles d’analyse. La première échelle est celle d’un tronçon longitudinal de 10 km de la plaine alluviale de la rivière Allier. À cette échelle de travail, un avion a été utilisé pour les prises de vue aérienne. La deuxième échelle d’analyse est celle d’un banc boisé, localisé dans la zone de 10 km. À cette échelle, la couverture photographique a été faite à l’aide d’un drone. Pour les deux objets d’étude des modèles de hauteur du couvert végétal (MHC) sont produits. La précision des MHC est ensuite vérifiée à partir de la mesure de la hauteur d’arbres sur le terrain. Les résultats révèlent une très bonne précision des modèles pour les deux approches, de l’ordre du mètre à l’échelle du tronçon de 10 km et de quelques centimètres à l’échelle du banc. Cette inégalité s’explique surtout par des résolutions photographiques différentes pour les deux missions. Il ressort de ce travail que les deux approches sont complémentaires. La première permet de cartographier la structure de la végétation à l’échelle de la plaine alluviale, la deuxième permet une cartographie de la végétation à plus haute résolution mais seulement à une échelle plus réduite.

Published
2015

24. From plant traits to the fluvial landscape: different tools and methods for a multi-scale study of interactions between riparian vegetation and hydrogeomorphic processes

Author

Hortobágyi, Borbála, Corenblit, Dov Jean-François, Peiry, Jean-Luc, Steiger, Johannes, Vautier, Franck, Hortobágyi, Borbála, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
[SDE] Environmental Sciences, spatial analysis, [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology, [SHS.GEO] Humanities and Social Sciences/Geography, [SHS.GEO]Humanities and Social Sciences/Geography, hydrogeomorphic processes, riparian vegetation dynamics, plant traits, [SDE]Environmental Sciences, mulit-scale study, [SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

25. Stereophotogrammetry in studies of riparian vegetation dynamics

Author

Hortobágyi, Borbála, Vautier, Franck, Corenblit, Dov Jean-François, Steiger, Johannes, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), and Hortobágyi, Borbála

Subjects
[SDE] Environmental Sciences, vegetation height model, aerial photographs, [SHS.GEO] Humanities and Social Sciences/Geography, [SDE]Environmental Sciences, riparian vegetation, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, [SHS.GEO]Humanities and Social Sciences/Geography, photogrammetry, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
Abstract

International audience; Riparian vegetation responds to hydrogeomorphic disturbances and also controls sediment deposition and erosion.Spatio-temporal riparian vegetation dynamics within fluvial corridors have been quantified in many studies usingaerial photographs and GIS. However, this approach does not allow the consideration of woody vegetationgrowth rates (i.e. vertical dimension) which are fundamental when studying feedbacks between the processes offluvial landform construction and vegetation establishment and succession. We built 3D photogrammetric modelsof vegetation height based on aerial argentic and digital photographs from sites of the Allier and Garonne Rivers(France). The models were realized at two different spatial scales and with two different methods. The "large"scale corresponds to the reach of the river corridor on the Allier river (photograph taken in 2009) and the "small"scale to river bars of the Allier (photographs taken in 2002, 2009) and Garonne Rivers (photographs taken in 2000,2002, 2006 and 2010). At the corridor scale, we generated vegetation height models using an automatic procedure.This method is fast but can only be used with digital photographs. At the bar scale, we constructed the modelsmanually using a 3D visualization on the screen. This technique showed good results for digital and also argenticphotographs but is very time-consuming. A diachronic study was performed in order to investigate vegetation successionby distinguishing three different classes according to the vegetation height: herbs (4 m). Both methods, i.e. automatic and manual, were employed to study the evolution of the three vegetationclasses and the recruitment of new vegetation patches. A comparison was conducted between the vegetationheight given by models (automatic and manual) and the vegetation height measured in the field. The manually producedmodels (small scale) were of a precision of 0.5-1 m, allowing the quantification of woody vegetation growthrates. Thus, our results show that the manual method we developed is accurate to quantify vegetation growth ratesat small scales, whereas the less accurate automatic method is appropriate to study vegetation succession at thecorridor scale. Both methods are complementary and will contribute to a further exploration of the mutual relationshipsbetween hydrogeomorphic processes, topography and vegetation dynamics within alluvial systems, addingthe quantification of the vertical dimension of riparian vegetation to their spatio-temporal characteristics.

Published
2014

26. Avantages et limites des méthodes photogrammétriques pour l’étude de la végétation riveraine

Author

Hortobágyi, Borbála, Corenblit, Dov Jean-François, Steiger, Johannes, PEIRY, Jean-Luc, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Steiger, Johannes, Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
[SHS.GEO] Humanities and Social Sciences/Geography, [SHS.GEO]Humanities and Social Sciences/Geography, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

27. Populus nigra L. establishment and fluvial landform construction: biogeomorphic dynamics within a channelized river

Author

Corenblit, Dov Jean-François, Steiger, Johannes, Charrier, Gaspard, Darrozes, José, Garófano-Gómez, Virginia, Garreau, Alexandre, González, Eduardo, Gurnell, Angela M., Hortobágyi, Borbála, Julien, Frédéric, Lambs, Luc, Larrue, Sébastien, Otto, Thierry, Roussel, Erwan, Vautier, Franck, Voldoire, Olivier, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Department of Biological Sciences [Denver], University of Denver, School of Geography, Queen Mary University of London, Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales [Toulouse] (CNES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Maison des Sciences de l'Homme - Clermont Ferrand (MSH Clermont), Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)

Subjects
ecosystem engineer, vegetation establishment, [SDV]Life Sciences [q-bio], [SDE]Environmental Sciences, black poplar, biogeomorphology, fluvial landform
Abstract

International audience; Populations of the riparian pioneer species Populus nigra L. which establish on alluvial bars within river channelsmodulate sediment dynamics and fluvial landforms. Dense cohorts of P. nigra have colonized gravel point bars along the channelizedRiver Garonne, France, during the last 20 years and have enhanced the vertical, lateral and longitudinal development of thebars. For this period, the geomorphic characteristics of two wooded point bars on this laterally stable river are closely linked tothe spatial distribution and intensity of establishment and resistance of different cohorts of P. nigra. Furthermore, P. nigra colonizationdynamics were controlled by engineer effects of this same species. This relationship is illustrated by a significant correlation betweenkey geomorphic and biological variables measured in situ and characterized with a set of four aerial photographs taken between2000 and 2010. The development of wooded point bars, which are discrete biogeomorphic units, over the studied period, appearto result from a specific biogeomorphic positive feedback of matter aggregation and vegetation establishment related to sedimenttrapping and stabilization by pioneer engineer plants.We propose a conceptual model of biogeomorphic unit construction for channelized,lateral stable rivers.We consider the resultant biogeomorphic units as functional from an ecological point of view because P.nigra enhances at the cohort scale (i) its own inherent capacity to resist hydrogeomorphic disturbances, and (ii) its resilience capacityas a result of successful colonization, especially downstream of mature poplar stands.

Published
2016
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28. Succession processes of a dynamic riparian ecosystem: The lower Allier River (France)

Author

Metz, Meike, Egger, Gregory, Díaz-Redondo, María, Garófano-Gómez, Virginia, Hortobágyi, Borbála, Steiger, Johannes, Corenblit, Dov, Karlsruhe Institute of Technology (KIT), School of Engineering. University of Lisbon, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), and Garófano Gómez, Virginia

Subjects
[SDE] Environmental Sciences, [SDV] Life Sciences [q-bio], [SDV.EE]Life Sciences [q-bio]/Ecology, environment, [SDV.EE] Life Sciences [q-bio]/Ecology, environment, Geography & travel, [SDV]Life Sciences [q-bio], fungi, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS, ddc:910
Abstract

Riparian ecosystems are highly dynamic and are subject to hydrogeomorphological processes. In Europe, the lower Allier River (France) is one of the last remaining meandering rivers with laterally dynamic sections. For this study, we developed an original method to analyse the vegetation assemblages and succession processes. The analysis includes both spatial and temporal evolution in order to evaluate the shifting paradigm of habitat mosaic at the study site over a 60-year period. On the long-term, floods with low recurrence intervals tend to be important for small scale habitat changes, whereas major flood events lead to major habitat changes. Flood events did not change the overall habitat composition of the active tract but their spatial distribution. The lack of major hydrogeomorphological disturbance observed during the last two decades, however, led to a higher stability of floodplain ecotopes.

Published
2016

29. Monitoring and reconstructing past biogeomorphic succession within fluvial corridors using stereophotogrammetry

Author

Vautier, Franck, Corenblit, Dov Jean-François, Hortobágyi, Borbála, Fafournoux, Laure, Steiger, Johannes, Maison des Sciences de l'Homme - Clermont Ferrand (MSH Clermont), Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Laboratoire de Géographie Physique et Environnementale (GEOLAB), Centre National de la Recherche Scientifique (CNRS)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne (UCA), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
[SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016
Full Text
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32. Response of black poplar (Populus nigra L.) to hydrogeomorphological constraints: a semi-controlled ex situ experiment

Author

Garófano-Gómez, Virginia, Corenblit, Dov, Steiger, Johannes, Moulia, Bruno, Ploquin, Stéphane, Chaleil, Patrice, Forestier, Olivier, Evette, André, Gonzalez, Eduardo, Hortobágyi, Borbála, Lambs, Luc, Université d'Auvergne - Clermont-Ferrand I (UdA), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier (PIAF), Institut National de la Recherche Agronomique (INRA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Direction Régionale de l'Alimentation, de l'Agriculture et de la Forêt (DRAAF), Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), University of Denver, Zône Atelier Bassin du Rhône (ZABR). FRA., Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)

Subjects
populus nigra L, hydro-geomorphologie, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, peuplier noir, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2015

33. Une analyse écologique orientée vers des processus d’un système riverain dynamique: la rivière Allier aval (France)

Author

Metz, Meike, Egger, Gregory, Díaz, María, Schmidtlein, Sebastian, Dister, Emil, Garófano-Gómez, Virginia, Steiger, Johannes, Hortobágyi, Borbála, Corenblit, Dov Jean-François, Karlsruhe Institute of Technology (KIT), WWF-Institute of Floodplain Ecology, University of Lisbon, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), ZABR & GRAIE, Garófano Gómez, Virginia, Universidade de Lisboa = University of Lisbon (ULISBOA), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
river Allier, vegetation succession, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, [SDV.EE] Life Sciences [q-bio]/Ecology, environment, [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology, spatio-temporal processes, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, floodplain vegetation
Abstract

Riparian ecosystems are highly dynamic ecosystems subjected to hydrogeomorphological processes. Their geomorphological, sedimentological and hydrological heterogeneity makes them one of the richest ecosystems in terms of species diversity. In addition, riparian zones also provide numerous ecosystem functions and services to society. In the European context, the lower river Allier (France) is one of the last remaining rivers with laterally dynamic sections. Its historical evaluation has shown repeated river bed displacements during the last century. Spatio-temporal processes on a highly mobile river section of the lower river Allier have been studied analysing the mosaic of vegetation types and successional phases as well as physical habitat parameters. Understanding riparian ecosystem functioning and evolution in natural or nearly natural systems is essential for river restoration practices in highly degraded rivers. This understanding may lead to the establishment of better sustainable river rehabilitation targets that consider societal needs and natural processes., Les écosystèmes riverains sont des écosystèmes dynamiques soumis aux processus hydrogéomorphologiques avec une forte hétérogénéité géomorphologique, sédimentologique et hydrologique et de nombreux services écosystémiques rendus à la société. Ils font partie des écosystèmes les plus riches en termes de diversité des espèces. Dans le contexte européen, la rivière Allier aval est une des dernières rivières avec des sections à forte mobilité latérale. L'analyse historique a démontré cette forte mobilité latérale des chenaux durant le siècle dernier. Des processus spatio-temporels d'une section de rivière très mobile ont été étudiés à travers l'analyse de la mosaïque des types de végétation, les phases de succession, ainsi que les paramètres physiques des habitats. Comprendre le fonctionnement et l'évolution des écosystèmes riverains dans des systèmes naturels ou proche de l'état naturel est essentiel pour la restauration des cours d'eau très dégradées, afin de permettre la mise en place de stratégies de réhabilitions durables qui considèrent les besoins de la société et les processus naturels.

Published
2015

34. Towards harmonization of image velocimetry techniques for river surface velocity observations.

Author

Perks, Matthew T., Dal Sasso, Silvano Fortunato, Hauet, Alexandre, Le Coz, Jérôme, Pearce, Sophie, Peña-Haro, Salvador, Tauro, Flavia, Grimaldi, Salvatore, Hortobágyi, Borbála, Jodeau, Magali, Maddock, Ian, Pénard, Lionel, and Manfreda, Salvatore

Subjects
OPEN-channel flow, HYDRAULIC measurements, IMAGE analysis, COMPUTER software development, VELOCITY, PARTICLE image velocimetry
Abstract

Since the turn of the 21st Century, image based velocimetry techniques have become an increasingly popular approach for determining open-channel flow in a range of hydrological settings across Europe, and beyond. Simultaneously, a range of large-scale image velocimetry algorithms have been developed, equipped with differing image pre-processing, and analytical capabilities. Yet in operational hydrometry, these techniques are utilised by few competent authorities. Therefore, imagery collected for image velocimetry analysis, along with validation data is required both to enable inter-comparisons between these differing approaches and to test their overall efficacy. Through benchmarking exercises, it will be possible to assess which approaches are best suited for a range of fluvial settings, and to focus future software developments. Here we collate, and describe datasets acquired from six countries across Europe and Asia, consisting of videos that have been subjected to a range of pre-processing, and image velocimetry analysis. [ABSTRACT FROM AUTHOR]

Published
2019
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35. Application de la photogrammétrie stéréoscopique pour l’étude de la végétation alluviale : exemple de l’Allier (France)

Author

Hortobágyi, Borbála, Vautier, Franck, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Hortobágyi, Borbála, Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)

Subjects
[SDE] Environmental Sciences, vegetation height model, aerial photographs, [SHS.GEO] Humanities and Social Sciences/Geography, [SDE]Environmental Sciences, riparian vegetation, [INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation, [SHS.GEO]Humanities and Social Sciences/Geography, photogrammetry, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

36. Contribution de l’analyse multi-temporelle pour la gestion et restauration des cours d’eau : végétation riveraine et résilience (projet GALE&T)

Author

Steiger, Johannes, Corenblit, Dov Jean-François, Arrignon, Florent, Beauger, Aude, Dejaifve, P-A, Delmotte, Sebastien, Hortobágyi, Borbála, Lambs, Luc, Planty-Tabacchi, Anne-Marie, Sans, F., Simon, P., Tabacchi, Eric, Valette, Philippe, Vautier, Franck, Voldoire, Olivier, Yeny, E., Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), MAD-Environnement, Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Géographie de l'environnement (GEODE), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Goeldner-Gianella, L., Barreteau, O., Euzen, A., Pinon-Leconte, M., Gautier, Q., Arnould, P., Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse - Jean Jaurès (UT2J)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
végétation riveraine, [SDE]Environmental Sciences, gestion, ComputingMilieux_MISCELLANEOUS, cours d'eau, [SHS]Humanities and Social Sciences
Abstract

International audience

Published
2015

38. Riparian plant response and effect traits on alluvial bars.

Author

Corenblit, Dov, Hortobágyi, Borbála, Steiger, Johannes, Ding, ZhuQing, Lambs, Luc, and Peiry, Jean-Luc

Subjects
*PLANT capacity, *RIPARIAN plants, *FLUVIAL geomorphology, *BLACK poplar, *PLANT species, *LANDFORMS
Abstract

Within riparian corridors, vegetation establishment is controlled by hydrogeomorphology which in turn is modulated by plant species acting as ecosystem engineers. The potential of different plant species to affect geomorphology according to their exposure to different level of mechanical stress was poorly considered. The comprehension of the variation of morphological and biomechanical response trait attributes of plants is crucial to better understand how pioneer riparian plants succeed in establishing on alluvial bars and affect fluvial geomorphology. We investigated the response of vegetation to hydrogeomorphic constraints and its engineering effect at two spatial scales within the dynamic Allier River, France. At the broader reach scale, we studied on sixteen alluvial bars the aptitude of three dominant pioneer riparian Salicaceae species (Populus nigra L., Salix purpurea L. and Salix alba L.) to establish and to act as ecosystem engineers by trapping fine sediment. At the finer bar scale, we quantified the relation between response trait attributes of young (1-2yrs) P. nigra plants and their exposure to three different levels of mechanical stress. Our results show (i) that the capacity of riparian plants to establish and act as ecosystem engineers depends of species ecology, the age of individuals and on their locations and (ii) that P. nigra plants develop different response traits depending on their exposure to mechanical stress. From a functional trait perspective, our results suggest that interspecific functional trait diversity and intraspecific plasticity of riparian engineer species plays an important role in vegetation resilience and resistance. Trait diversity and plasticity also control the overall capacity of plants to enhance fluvial landform construction at the scale of the alluvial bar. Keywords: riparian Salicaceae species; fluvial landforms; ecosystem engineer; response and effect plant traits; multi-scale study [ABSTRACT FROM AUTHOR]

Published
2019

39. Evaluation of image-based velocity measurements for computing river discharge in real-time.

Author

Hortobágyi, Borbála, Perks, Matthew T., Everard, Nick, Manson, Susan, Rowland, Juliet, Large, Andrew R. G., and Russell, Andrew J.

Subjects
*STREAM measurements, *VELOCITY measurements, *PARTICLE image velocimetry, *FLOW measurement, *OPTICAL flow, *MEASUREMENT of runoff, *DISPLACEMENT (Mechanics)
Abstract

Quantifying key hydrological parameters, such as the river discharge, during high flow eventsfrequently faces technical difficulties and is potentially dangerous to operatives. Theapplication of novel hydrological monitoring techniques may reduce these risks, and offersthe potential to rapidly advance our understanding of operating processes, which may reducerisk to society. We therefore propose a low-cost non-contact alternative method to determineriver discharge in real-time. Our approach is an image-based technique, where video footageis subjected to optical flow tracking algorithms, enabling the displacement rates ofnaturally-occurring features on the water surface to be computed. This is achieved throughthe application of the Kanade-Lucas-Tomasi (KLT) particle image velocimetry (PIV)approach. We installed our real-time camera system at the Environment Agency’s Austin’sBridge Gauging Station on the hydrologically responsive River Dart (SW UK). Our objectivewas to compare discharge measurement results obtained with our KLT-PIV method to thosefrom an established and well-proven flow measurement station. We compared ourmeasurements with 73 ADCP transects at discharges ranging from 3-101 m3 s-1 and theofficial rating curve of the Environment Agency. We obtained promising results, our KLT-PIVsurface velocity measurements were predominantly within 10% compared to theEnvironment Agency’s discharge computation. This indicates that the KLT-PIV techniqueoffers potential for the safe and cost-effective real-time assessment of river flows, even inpotentially damaging high magnitude flood events. Therefore, it offers the opportunityfor greatly improved flow monitoring in countries with established networks, andfor the rapid development of monitoring where networks are less well developed. [ABSTRACT FROM AUTHOR]

Published
2019

41. Towards harmonization of image velocimetry techniques for river surface velocity observations

Author

M. T. Perks, S. F. Dal Sasso, A. Hauet, E. Jamieson, J. Le Coz, S. Pearce, S. Peña-Haro, A. Pizarro, D. Strelnikova, F. Tauro, J. Bomhof, S. Grimaldi, A. Goulet, B. Hortobágyi, M. Jodeau, S. Käfer, R. Ljubičić, I. Maddock, P. Mayr, G. Paulus, L. Pénard, L. Sinclair, S. Manfreda, Newcastle University [Newcastle], Università della Basilicata (Matera), EDF (EDF), Environment and Climate Change Canada, Riverly (Riverly), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Worcester State University [Worcester], Photrack AG: Flow Measurements, Carinthia University of Applied Sciences, Università degli studi della Tuscia [Viterbo], Mechanical and Aerospace Engineering Department [NYU Tandon School of Engineering], NYU Tandon School of Engineering, UMR LHSV (UMR LHSV), Avant création Cerema, Verbund Hydro Power GmbH, University of Belgrade [Belgrade], flussbau iC, Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy, COST Action (European Cooperation in Science and Technology) : CA16219, Ministero degli Affari Esteri project 2015 Italy-USA : PGR00175, POR-FESR 2014-2020 (European Regional Development Fund Horizon 2020) : 737616, 'Departments of Excellence-2018' Program (Dipartimenti di Eccellenza) of the Italian Ministry of Education, University and Research, DIBAF-Department of University of Tuscia, Project 'Landscape 4.0 -food, wellbeing and environment', Perks, Matthew T., Dal Sasso, Silvano Fortunato, Hauet, Alexandre, Jamieson, Elizabeth, Le Coz, Jérôme, Pearce, Sophie, Peña-Haro, Salvador, Pizarro, Alonso, Strelnikova, Dariia, Tauro, Flavia, Bomhof, Jame, Grimaldi, Salvatore, Goulet, Alain, Hortobágyi, Borbála, Jodeau, Magali, Käfer, Sabine, Ljubičić, Robert, Maddock, Ian, Mayr, Peter, Paulus, Gernot, Pénard, Lionel, Sinclair, Leigh, and Manfreda, Salvatore

Subjects
Hydrometry, 010504 meteorology & atmospheric sciences, Computer science, FLOW, 0207 environmental engineering, 02 engineering and technology, computer.software_genre, Q1, 01 natural sciences, Image (mathematics), Software, LASER SPECKLE PHOTOGRAPHY, 020701 environmental engineering, lcsh:Environmental sciences, 0105 earth and related environmental sciences, lcsh:GE1-350, GB, business.industry, [SDE.IE]Environmental Sciences/Environmental Engineering, lcsh:QE1-996.5, LSPIV, Benchmarking, Velocimetry, Surface velocity, lcsh:Geology, Range (mathematics), STREAM, General Earth and Planetary Sciences, CAMERAS, Data mining, Focus (optics), business, computer
Abstract

Since the turn of the 21st century, image-based velocimetry techniques have become an increasingly popular approach for determining open-channel flow in a range of hydrological settings across Europe and beyond. Simultaneously, a range of large-scale image velocimetry algorithms have been developed that are equipped with differing image pre-processing and analytical capabilities. Yet in operational hydrometry, these techniques are utilised by few competent authorities. Therefore, imagery collected for image velocimetry analysis (along with reference data) is required both to enable inter-comparisons between these differing approaches and to test their overall efficacy. Through benchmarking exercises, it will be possible to assess which approaches are best suited for a range of fluvial settings, and to focus future software developments. Here we collate and describe datasets acquired from seven countries across Europe and North America, consisting of videos that have been subjected to a range of pre-processing and image velocimetry analyses (Perks et al., 2020, https://doi.org/10.4121/uuid:014d56f7-06dd-49ad-a48c-2282ab10428e). Reference data are available for 12 of the 13 case studies presented, enabling these data to be used for reference and accuracy assessment.

Published
2020
Full Text
View/download PDF

42. 3D diachronic survey of riparian vegetation dynamics by photogrammetric methods: application of UAV and small airplane photographs

Author

Borbála Hortobágyi, Andreas Burkart, Dov Jean-François Corenblit, Jean-Luc PEIRY, Johannes Steiger, Franck Vautier, Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institute für Bio- und Geowissenschaften, Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and Hortobágyi, Borbála

Subjects
[SDE] Environmental Sciences, [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology, riparian vegetation dynamics, 3D diachronic survey, aerial photographs, [SHS.GEO] Humanities and Social Sciences/Geography, UAV, [SDE]Environmental Sciences, [SHS.GEO]Humanities and Social Sciences/Geography, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, photogrammery, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

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