22 results on '"Sous, D."'
Search Results
2. Momentum Balance Across a Barrier Reef
- Author
-
Sous, D., primary, Dodet, G., additional, Bouchette, F., additional, and Tissier, M., additional
- Published
- 2020
- Full Text
- View/download PDF
3. Adaptive Discontinuous Galerkin Method for Richards Equation
- Author
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Clément, J.-B., primary, Golay, F., additional, Ersoy, M., additional, and Sous, D., additional
- Published
- 2020
- Full Text
- View/download PDF
4. Density stratification and turbulent mixing in a salt-wedge estuary: The Adour river
- Author
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Defontaine, S., Sous, D., Maron, S., Morichon, D., and TELEMAC-MASCARET Core Group
- Subjects
Computer Science::Programming Languages ,Hydrodynamik (532.5) - Abstract
Hydrodynamics Abstract
- Published
- 2019
5. Mesures in-situ d'impacts de vagues sur une digue composite
- Author
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Poncet, P.A., Abadie, S., Larroque, B., Liquet, B., and Sous, D.
- Subjects
aération ,impact ,vague ,digue ,mesure - Abstract
Afin d’étudier les pressions d’impact in-situ, la digue de l’Artha à Saint-Jean de Luz a été équipée de deux capteurs de pression haute-fréquence disposés l’un au dessus de l’autre sur la partie la plus raide du musoir ouest. Ces deux capteurs ont ainsi enregistré le signal de pression à 10 kHz par tranches de 10 minutes toutes les heures de janvier à avril 2016. Par ailleurs le champs de vagues au large est mesuré par une bouée directionnelle, le niveau d’eau est obtenu au marégraphe de Socoa et le vent est mesuré au sémaphore de Socoa. Les mesures de pression sont en accord avec des études similaires précédentes([1], [2]), mettant en évidence des pics de pressions significativement plus faibles que ceux obtenus en canal [3] ou par simulation numérique. La structure de la digue est à l’origine de phénomènes qui sont en général susceptibles de minimiser les impacts par rapport au cas idéalisé. Un des objectifs de cette étude est aussi d’identifier les conditions qui génèrent les impacts les plus destructeurs. Une première analyse statistique de l’influence des facteurs environnementaux a été réalisé. Une étude du signal de pression brut montre que la digue est soumise à différents types d’impact. La grande majorité des impacts sont relativement lents et leurs intensités en partie contrôlée par la hauteur de vague. Mais des impacts intenses et rapides ont aussi été mesurés dans des conditions de houle et de vent relativement calme. L’intensité de ces impacts ne peut être expliquée uniquement par la pression hydrostatique. Des effets potentiel de compression de poche d’air sont étudiés. La prochaine campagne de mesure qui emploiera plus d’une vingtaine de capteurs permettra peut être de détecter plus d’impacts de ce type et de mieux comprendre leur dynamique.
- Published
- 2018
- Full Text
- View/download PDF
6. DISCONTINUOUS GALERKIN METHOD FOR STEADY-STATE RICHARDS EQUATION
- Author
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Clément, J.-B., primary, Ersoy, M., additional, Golay, F., additional, and Sous, D., additional
- Published
- 2019
- Full Text
- View/download PDF
7. Wave Runup Over Steep Rocky Cliffs
- Author
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Dodet, G., primary, Leckler, F., additional, Sous, D., additional, Ardhuin, F., additional, Filipot, J.F., additional, and Suanez, S., additional
- Published
- 2018
- Full Text
- View/download PDF
8. Cahier thématique : La mer et le littoral de Provence-Alpes-Côte d’Azur face au changement climatique
- Author
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Babène, A, Bidet, Y, Boudouresque, F, Claeys, Cécilia, David, R, Dhenain, S, Doze, E, Feral, P, Francour, Patrice, Gattuso, Jean-Pierre, Gianni, F, Giuliano, J, Hatt, E, Hilmi, Nathalie, Hizmaj, E, Irisson, Jean-Olivier, Lagneau, C, Lambert, L, Lemee, Rodolphe, Lepetit, A, Mangialajo, Luisa, Marchesseaux, G, Marçot, N, Michalak, S, Mousseau, Laure, Rey, V, Ruitton, S, Rossello, P, Sabatier, F, Safa, A, Sous, D, Stépanian, A, Taupier-Letage, Isabelle, Thibault-Botha, D, Thibaut, M, Thibaut, Thierry, Touboul, J, LABORATOIRE DE CANCEROLOGIE INSERM EMI 0359, Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire Population-Environnement-Développement (LPED), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU), Centre Mémoire de Ressources et de Recherche [Nice] (CMRR Nice), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre Hospitalier Universitaire de Nice (CHU Nice)-Université Côte d'Azur (UCA), Cognition Behaviour Technology (CobTek), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre Hospitalier Universitaire de Nice (CHU Nice)-Institut Claude Pompidou [Nice] (ICP - Nice)-Université Côte d'Azur (UCA), Ecosystèmes Côtiers Marins et Réponses aux Stress (ECOMERS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Institut du Développement Durable et des Relations Internationales (IDDRI), Institut d'Études Politiques [IEP] - Paris, Centre Scientifique de Monaco (CSM), Environment Laboratories (IAEA), International Atomic Energy Agency [Vienna] (IAEA), Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS), Centre recherche en CardioVasculaire et Nutrition = Center for CardioVascular and Nutrition research (C2VN), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre d'Investigation Clinique [Hôpital de la Conception - APHM] (CIC), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Institut Paoli-Calmettes, Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Hôpital de la Conception [CHU - APHM] (LA CONCEPTION), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), GREC-PACA, and Les cahiers du GREC-PACA, Association pour l’innovation et la recherche au service du climat (AIR)
- Subjects
[SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology - Abstract
International audience
- Published
- 2017
9. Cahier thématique : La mer et le littoral de Provence-Alpes-Côte d’Azur face au changement climatique
- Author
-
Babène, A., Bidet, Y., Boudouresque, F., Cécilia Claeys, Romain DAVID, Dhenain, S., Doze, E., Feral, P., Patrice Francour, Jean-Pierre Gattuso, Gianni, F., Giuliano, J., Hatt, E., Nathalie Hilmi, Hizmaj, E., Jean-Olivier Irisson, Lagneau, C., Lambert, L., Rodolphe Lemee, Lepetit, A., Luisa Mangialajo, Marchesseaux, G., Marçot, N., Michalak, S., Laure Mousseau, Rey, V., Ruitton, S., Rossello, P., Sabatier, F., Safa, A., Sous, D., Stépanian, A., Isabelle Taupier-Letage, Thibault-Botha, D., Thibaut, M., Thierry Thibaut, Touboul, J., LABORATOIRE DE CANCEROLOGIE INSERM EMI 0359, Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire Population-Environnement-Développement (LPED), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU), Centre Mémoire de Ressources et de Recherche [Nice] (CMRR Nice), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre Hospitalier Universitaire de Nice (CHU Nice)-Université Côte d'Azur (UCA), Cognition Behaviour Technology (CobTek), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre Hospitalier Universitaire de Nice (CHU Nice)-Institut Claude Pompidou [Nice] (ICP - Nice)-Université Côte d'Azur (UCA), Ecosystèmes Côtiers Marins et Réponses aux Stress (ECOMERS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Institut du Développement Durable et des Relations Internationales (IDDRI), Institut d'Études Politiques [IEP] - Paris, Centre Scientifique de Monaco (CSM), Environment Laboratories (IAEA), International Atomic Energy Agency [Vienna] (IAEA), Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS), Centre recherche en CardioVasculaire et Nutrition = Center for CardioVascular and Nutrition research (C2VN), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre d'Investigation Clinique [Hôpital de la Conception - APHM] (CIC), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Institut Paoli-Calmettes, Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Hôpital de la Conception [CHU - APHM] (LA CONCEPTION), Institut méditerranéen d'océanologie (MIO), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology - Abstract
International audience
- Published
- 2017
10. Effect of a submerged plate on the near-bed dynamics underincoming waves in deep water conditions
- Author
-
Rey, V., primary, Touboul, J., additional, and Sous, D., additional
- Published
- 2015
- Full Text
- View/download PDF
11. Block-based adaptive mesh refinement scheme using numerical density of entropy production for three-dimensional two-fluid flows
- Author
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Golay, F., primary, Ersoy, M., additional, Yushchenko, L., additional, and Sous, D., additional
- Published
- 2015
- Full Text
- View/download PDF
12. Recurrent Onychomadesis of the Toenails in Children and Adults: A Case Series
- Author
-
Lu Chen, Dana Sous, Elizabeth Nieman, Bianca Maria Piraccini, Michela Starace, Carrie C. Coughlin, Milan J. Anadkat, Sous D., Starace M.V.R., Chen L., Nieman E.L., Anadkat M.J., Piraccini B.M., and Coughlin C.C.
- Subjects
medicine.medical_specialty ,Series (stratigraphy) ,Clinical Investigations − Brief Report ,integumentary system ,business.industry ,Nail ,Dermatology ,Onychomadesis ,Pediatrics ,Onychomadesi ,Medicine ,Nail dystrophy ,skin and connective tissue diseases ,business - Abstract
Introduction: Onychomadesis occurs when the nail plate separates from the nail matrix and nail bed, eventually leading to shedding of the nail. This condition has been attributed to viral infections, autoimmune disorders, drug side effects, and physical trauma. A subset of patients has a recurrent form of onychomadesis without a clear trigger; this phenomenon is not well characterized in the literature. Case Presentation: We present a case series of pediatric and adult patients with recurrent toenail onychomadesis in order to better characterize the disorder and explore possible etiologies, risk factors, and treatments. Discussion/Conclusion: For the cases herein, we propose microtrauma associated with footwear as the underlying etiology given the periodicity of nail shedding, exclusion of other etiological factors, and presence of predisposing risk factors in certain patients. Many patients saw improvement with application of urea 40% cream, suggesting this can be a valuable part of a treatment strategy, in addition to minimizing injury to involved digits.
- Published
- 2021
13. Quantifying the topographical structure of rocky and coral seabeds.
- Author
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Sous D, Meulé S, Dealbera S, Michaud H, Gassier G, Pezerat M, and Bouchette F
- Subjects
- Animals, Geologic Sediments, Ecosystem, Anthozoa anatomy & histology
- Abstract
Describing the structural complexity of seabeds is of primary importance for a number of geomorphological, hydrodynamical and ecological issues. Aiming to bring a decisive insight on the long-term development of a unified view, the present study reports on a comparative multi-site analysis of high resolution topography surveys in rough nearshore environments. The nine study sites have been selected to cover a wide variety of topographical features, including rocky and coral seabeds. The topography data has been processed to separate roughness and bathymetry-related terrain features, allowing to perform a comprehensive spectral and statistical analysis of each site. A series of roughness metrics have been tested to identify the most relevant estimators of the bottom roughness at each site. The spectral analysis highlights the systematic presence of a self-affine range of variable extension and spectral slope. The standard deviation of the seabed elevation varies from 0.04 to 0.77 m. The statistical and multi-scale analysis performed on the whole set of roughness metrics allows to identify connection between metrics and therefore to propose a reduced set of relevant roughness estimators. A more general emphasis is placed on the need to properly define a unified framework when reconstructing roughness statistics and bathymetry from fine seabed topographical data., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2024 Sous et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
- Published
- 2024
- Full Text
- View/download PDF
14. Power of Representation in Educational Materials: Teaching Cutaneous Lupus Across Skin Tones in an Interactive Module.
- Author
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Tinianow A, Sous D, Abreu D, Scharff TB, Thomashow M, Bayliss S, Goglin S, Monroe JR, Mwanthi M, Jones HA, and Zickuhr L
- Abstract
Objective: Clinicians report low confidence assessing cutaneous lupus erythematosus (CLE) lesions, especially for patients who identify as Black, Indigenous, and People of Color (BIPOC) who are historically excluded from educational materials. To address this, we created an online, interactive module teaching an approach to assessing CLE across skin tones and measured its impact on medical knowledge and confidence., Methods: Our team created a module with case-based methods to introduce an approach to CLE, common mimicking rashes, and tips for photographing cutaneous lesions in BIPOC. Graduate medical trainees from five academic institutions completed the module. Using surveys and pre-post testing, we assessed changes in medical knowledge and clinical confidence along with learner satisfaction, comparing responses using Wilcoxon-signed rank tests and chi square analysis. We assessed the module's representation of light, medium, and dark skin tones with chi square analysis., Results: The module represented light, medium, and dark skin tones (χ
2 = 4.788, P = 0.091) among 102 images (77.5%, n = 79) were novel images from authors' personal libraries. Ninety-four participants completed the postmodule test and evaluation survey. Analyses revealed significant improvement in medical knowledge identifying serologic studies associated with subacute CLE (χ2 = 14.035, P < 0.001) and describing how to photograph rashes (χ2 = 38.211, P < 0.001). Participants reported improved confidence across all learning objectives after module completion (P < 0.001)., Conclusion: This module is the first to introduce an approach to assessing CLE across skin tones, effectively increasing medical knowledge and confidence among graduate medical trainees., (© 2023 American College of Rheumatology.)- Published
- 2023
- Full Text
- View/download PDF
15. SMOTE-CD: SMOTE for compositional data.
- Author
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Nguyen T, Mengersen K, Sous D, and Liquet B
- Subjects
- Entropy, Minority Groups, Neural Networks, Computer, Acclimatization, Benchmarking
- Abstract
Compositional data are a special kind of data, represented as a proportion carrying relative information. Although this type of data is widely spread, no solution exists to deal with the cases where the classes are not well balanced. After describing compositional data imbalance, this paper proposes an adaptation of the original Synthetic Minority Oversampling TEchnique (SMOTE) to deal with compositional data imbalance. The new approach, called SMOTE for Compositional Data (SMOTE-CD), generates synthetic examples by computing a linear combination of selected existing data points, using compositional data operations. The performance of the SMOTE-CD is tested with three different regressors (Gradient Boosting tree, Neural Networks, Dirichlet regressor) applied to two real datasets and to synthetic generated data, and the performance is evaluated using accuracy, cross-entropy, F1-score, R2 score and RMSE. The results show improvements across all metrics, but the impact of oversampling on performance varies depending on the model and the data. In some cases, oversampling may lead to a decrease in performance for the majority class. However, for the real data, the best performance across all models is achieved when oversampling is used. Notably, the F1-score is consistently increased with oversampling. Unlike the original technique, the performance is not improved when combining oversampling of the minority classes and undersampling of the majority class. The Python package smote-cd implements the method and is available online., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2023 Nguyen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
- Published
- 2023
- Full Text
- View/download PDF
16. Effects of Biofilms and Particle Physical Properties on the Rising and Settling Velocities of Microplastic Fibers and Sheets.
- Author
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Jalón-Rojas I, Romero-Ramírez A, Fauquembergue K, Rossignol L, Cachot J, Sous D, and Morin B
- Subjects
- Biofilms, Environmental Monitoring, Microplastics, Plastics, Biofouling, Water Pollutants, Chemical analysis
- Abstract
Vertical dynamics of microplastics (MPs) in the water column are complex and not fully understood due to the diversity of environmental MPs and the impact of weathering and biofouling on their dynamical properties. In this study, we investigate the effects of the particle properties and biofilm on the vertical (settling or rising) velocity of microplastic sheets and fibers under laboratory conditions. The experiments focus on three types of MPs (polyester PES fibers, polyethylene terephthalate PET sheets, and polypropylene PP sheets) of nine sizes and two degrees of biological colonization. Even though pristine PES fibers and PET sheets had a similar density, the sinking velocity of fibers was much smaller and independent of their length. The settling or rising velocity of sheets increased with the particle size up to a threshold and then decreased in the wake of horizontal oscillations in large particles. Biofilms had unexpected effects on vertical velocities. Irregular biofilm distributions can trigger motion instabilities that decrease settling velocities of sheets despite the increase in density. Biofilms can also modify the orientation of fibers, which may increase their settling velocity. Finally, we selected the most performant theoretical formulation for each type of particle and proposed modifications to consider the effect of biofilm distribution.
- Published
- 2022
- Full Text
- View/download PDF
17. Recurrent Onychomadesis of the Toenails in Children and Adults: A Case Series.
- Author
-
Sous D, Starace MVR, Chen L, Nieman EL, Anadkat MJ, Piraccini BM, and Coughlin CC
- Abstract
Introduction: Onychomadesis occurs when the nail plate separates from the nail matrix and nail bed, eventually leading to shedding of the nail. This condition has been attributed to viral infections, autoimmune disorders, drug side effects, and physical trauma. A subset of patients has a recurrent form of onychomadesis without a clear trigger; this phenomenon is not well characterized in the literature., Case Presentation: We present a case series of pediatric and adult patients with recurrent toenail onychomadesis in order to better characterize the disorder and explore possible etiologies, risk factors, and treatments., Discussion/conclusion: For the cases herein, we propose microtrauma associated with footwear as the underlying etiology given the periodicity of nail shedding, exclusion of other etiological factors, and presence of predisposing risk factors in certain patients. Many patients saw improvement with application of urea 40% cream, suggesting this can be a valuable part of a treatment strategy, in addition to minimizing injury to involved digits., Competing Interests: The authors declare no conflicts of interest., (Copyright © 2021 by S. Karger AG, Basel.)
- Published
- 2022
- Full Text
- View/download PDF
18. Patient Satisfaction With Cosmetic Procedures Performed by Dermatology Residents.
- Author
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Michalski BM, Sous D, Carr DR, and Hurst EA
- Subjects
- Humans, Cosmetic Techniques standards, Dermatology education, Internship and Residency, Patient Satisfaction
- Published
- 2021
- Full Text
- View/download PDF
19. Cutaneous reactions to pediatric cancer treatment: Part I. Conventional chemotherapy.
- Author
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Sous D, Armstrong AE, Huang JT, Shah S, Carlberg VM, and Coughlin CC
- Subjects
- Child, Humans, Quality of Life, Antineoplastic Agents adverse effects, Drug Eruptions diagnosis, Drug Eruptions etiology, Neoplasms drug therapy, Skin Diseases chemically induced, Skin Diseases diagnosis
- Abstract
Chemotherapies often cause side effects of the skin, nails, and mucosal surfaces. These mucocutaneous toxicities contribute to morbidity and affect quality of life. Identification and management of these drug-induced eruptions is vital to allow for continuation of essential therapies. This review demonstrates the wide range of chemotherapy-induced cutaneous toxicities in children and includes clues for diagnosis as well as tips for counseling and management., (© 2020 Wiley Periodicals LLC.)
- Published
- 2021
- Full Text
- View/download PDF
20. Detecting Technical Anomalies in High-Frequency Water-Quality Data Using Artificial Neural Networks.
- Author
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Rodriguez-Perez J, Leigh C, Liquet B, Kermorvant C, Peterson E, Sous D, and Mengersen K
- Subjects
- Bayes Theorem, Water Quality, Neural Networks, Computer, Water
- Abstract
Anomaly detection (AD) in high-volume environmental data requires one to tackle a series of challenges associated with the typical low frequency of anomalous events, the broad-range of possible anomaly types, and local nonstationary environmental conditions, suggesting the need for flexible statistical methods that are able to cope with unbalanced high-volume data problems. Here, we aimed to detect anomalies caused by technical errors in water-quality (turbidity and conductivity) data collected by automated in situ sensors deployed in contrasting riverine and estuarine environments. We first applied a range of artificial neural networks that differed in both learning method and hyperparameter values, then calibrated models using a Bayesian multiobjective optimization procedure, and selected and evaluated the "best" model for each water-quality variable, environment, and anomaly type. We found that semi-supervised classification was better able to detect sudden spikes, sudden shifts, and small sudden spikes, whereas supervised classification had higher accuracy for predicting long-term anomalies associated with drifts and periods of otherwise unexplained high variability.
- Published
- 2020
- Full Text
- View/download PDF
21. Microplastics in a salt-wedge estuary: Vertical structure and tidal dynamics.
- Author
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Defontaine S, Sous D, Tesan J, Monperrus M, Lenoble V, and Lanceleur L
- Subjects
- Environmental Monitoring, France, Microplastics, Plastics, Estuaries, Water Pollutants, Chemical analysis
- Abstract
The abundance and distribution of microplastics in estuaries have been barely documented, and generally without accounting for the vertical structure in the water column. This study presents the very first data on the occurrence and distribution of microplastics in the Adour Estuary, SW France. The experimental data set was complemented by numerical simulations to gain understanding of the behaviour of suspended microplastics. Microplastics were found throughout the water column with a mean abundance of 1.13 part/m
3 . Films and fragments were the most abundant types of particles collected. Numerical simulations demonstrated that vertical distribution of microplastics in the water column is highly dependent on particle characteristics and on the local hydrodynamics. The main trend is that neutrally-buoyant microplastics are easily flushed out while heavier microplastics are prone to entrapment in the estuary, in particular under low discharge conditions. The present study suggest that estuaries could be a sink of microplastics., (Copyright © 2020 Elsevier Ltd. All rights reserved.)- Published
- 2020
- Full Text
- View/download PDF
22. Behaviour of plastic litter in nearshore waters: First insights from wind and wave laboratory experiments.
- Author
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Forsberg PL, Sous D, Stocchino A, and Chemin R
- Subjects
- Hydrodynamics, Laboratories, Environmental Monitoring, Plastics, Water Pollutants analysis, Wind
- Abstract
Plastic litter in nearshore waters is an environmental pollutant with increasing impact on coastal environments. At present, knowledge on basic plastic particle dynamics and the interaction with complex hydrodynamics is lacking. The present laboratory study, performed under controlled wave and wind conditions, demonstrates the dispersion of plastics in shallow waters. The study presents a simple case looking solely at cross-shore particle transport. The results show that both wind and waves as well as plastic properties (shape and density) govern the behaviour of plastic litter in the nearshore zone. Heavy particles behave like natural sand with accumulation in the wave breaking zone. Light particles have varying accumulation along the coastal profile depending on the wind, waves and particle shapes. More extensive characterization remains to be done in future studies., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
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