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Migrating from Greek mythology to scripture and ecclesiastical writing, sirens are best known for the perils they put on the road of Odysseus, and conversely, on that of the crucified Christ and on that of the pilgrim, two significations that Odysseus, the eternal voyageur tied to the mast, came to symbolize in the Middle Ages. Long acknowledged in past scholarship, the siren motif was perceived of as a multi-layered image, whose negative Homeric connotations suited an even vaster range of destructive meanings, moral, social and political. More than sheer misogyny, the hybrid sirens represent violation of social order, mainly that of the manly world. It is therefore no coincidence to find them dwelling in the biblical debauched town of Babylon, and in the land of Edom, destined to be destroyed, alongside hybrid centaurs, both in the Septuagint and in the Vulgate. These beasts gained much popularity throughout the Middle Ages, and embody the ultimate significance of evil in the medieval bestiary, as well as in a wide-ranging exegetical literature. This development may stand for the immense dispersion of the siren motif in Romanesque sculpture. Meant at an edifying purpose, sirens associated with urban destruction, lust, and avarice, signify the menace of sin they seduce humanity to fall into. The virtuous Christian, recognizing the long-enduring classical motif in its new Christian context should take the paradigm of Odysseus in his Christological typology, and restrain from evil. Though constituting a rather popular motif of Romanesque sculpture in general, sirens seem to inhabit many of the churches of the Auvergne and the Velay regions of France, along pilgrimage shrines, located lengthwise the Via Podiensis and crosswise routes, thus forming a marked feature of the local imagery. More than sheer enthusiasm for the antique, as past scholarship would have it, sirens seem to have chanted a very specific local chant in Auvergne-Velay. Constituting a major motif, which testifies to a profound understanding of their contextual implications, they represent a multifaceted image, denoting didactic, apotropaic, liturgical, social, and political messages. The context of pilgrimage and pilgrimage roads seems to have constituted a perfect setting for this multitude of sirens. The Via Podiensis was known as particularly uninviting. The mountainous topography, infested with thieves and brigands, provided lucrative opportunities of ambushing pilgrims on their way. It is the purpose of this paper to uncover the versatile imports of the siren antique motif in Romanesque Auvergne-Velay, by pointing out their meticulous perplexing delineation in the context of actual hardships pilgrims and congregants endured within pilgrimage shrines and roads. The first part of this paper will survey the range of allegorical significances of sirens from Homer to Jerome and to medieval exegeses, followed by a description of sirens in Auvergne-Velay. Then, I would like to suggest a new reading of the particular rendering of sirens in the small church of Pont-du-Château and in the pilgrimage church of Notre-Dame of Orcival, which may bear a local historical significance, resulting from the conflicting situations of pilgrims, on their way to worship the celestial realm.

[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAUThe contract of Simon Gérard was funded by the Institut National des Sciences de l’Univers (INSU/CNRS).; International audience; A comprehensive hydrometeorological dataset is presented spanning the period 1 January 2011-31 December 2014 to improve the understanding of the hydrological processes leading to flash floods and the relation between rainfall, runoff, erosion and sediment transport in a mesoscale catchment (Auzon, 116 km 2) of the Mediterranean region. Badlands are present in the Auzon catchment and well connected to high-gradient channels of bedrock rivers which promotes the transfer of suspended solids downstream. The number of observed variables, the various sensors involved (both in situ and remote) and the space-time resolution (∼ km 2 , ∼ min) of this comprehensive dataset make it a unique contribution to research communities focused on hydrom-eteorology, surface hydrology and erosion. Given that rainfall is highly variable in space and time in this region, the observation system enables assessment of the hydrological response to rainfall fields. Indeed, (i) rainfall data are provided by rain gauges (both a research network of 21 rain gauges with a 5 min time step and an operational network of 10 rain gauges with a 5 min or 1 h time step), S-band Doppler dual-polarization radars (1 km 2 , 5 min resolution), disdrometers (16 sensors working at 30 s or 1 min time step) and Micro Rain Radars (5 sensors, 100 m height resolution). Additionally, during the special observation period (SOP-1) of the HyMeX (Hydrolog-ical Cycle in the Mediterranean Experiment) project, two X-band radars provided precipitation measurements at Published by Copernicus Publications. 222 G. Nord et al.: High-resolution hydrometeorological data in a mesoscale Mediterranean catchment very fine spatial and temporal scales (1 ha, 5 min). (ii) Other meteorological data are taken from the operational surface weather observation stations of Météo-France (including 2 m air temperature, atmospheric pressure, 2 m relative humidity, 10 m wind speed and direction, global radiation) at the hourly time resolution (six stations in the region of interest). (iii) The monitoring of surface hydrology and suspended sediment is multi-scale and based on nested catchments. Three hydrometric stations estimate water discharge at a 2-10 min time resolution. Two of these stations also measure additional physico-chemical variables (turbidity, temperature, conductivity) and water samples are collected automatically during floods, allowing further geochemical characterization of water and suspended solids. Two experimental plots monitor overland flow and erosion at 1 min time resolution on a hillslope with vineyard. A network of 11 sensors installed in the intermittent hydrographic network continuously measures water level and water temperature in headwater subcatchments (from 0.17 to 116 km 2) at a time resolution of 2-5 min. A network of soil moisture sensors enables the continuous measurement of soil vol-umetric water content at 20 min time resolution at 9 sites. Additionally, concomitant observations (soil moisture measurements and stream gauging) were performed during floods between 2012 and 2014. Finally, this dataset is considered appropriate for understanding the rainfall variability in time and space at fine scales, improving areal rainfall estimations and progressing in distributed hydrological and erosion modelling.