The Floodscale experiment in the small catchment of Valescure, France: An overview of the isotopic and geochemical data base

Abstract

A 3‐year survey has been performed in the Cévennes mountain area, in the South of France, in order to separate surface, shallow sub‐surface and groundwater contributions to the flash flood processes. Electrical conductivity, temperature, pH, major and trace elements, total organic carbon and stable isotopes of water were monitored during low flows and floods, in the small (3.9 km2) granitic catchment of Valescure (Gard, France). The data collected during the campaign are widely presented, in relation to the different hydrological compartments (rainfall, shallow soil water, groundwater, streamwater). This constitutes at present the most complete hydrogeochemical database in the Cévennes area, available within the Hymex data base https://mistrals.sedoo.fr/HyMeX/(Valescure chemistry and water isotopes), DOI of the referenced dataset:https://doi.org/10.6096/MISTRALS-HyMeX.1406. Open Practices This article has earned an Open Data badge for making publicly available the digitally‐shareable data necessary to reproduce the reported results. The data is available at DOI 10.6096/MISTRALS-HyMeX.140657. Learn more about the Open Practices badges from the Center for Open Science: https://osf.io/tvyxz/wiki.

Characterization of subsurface fluxes at the plot scale during flash floods in the Valescure catchment, France

“…Note that before the salt injection, EC ranged between 0.06 and 0.09 mS/cm in the piezometers. This is coherent with the fact that the water used for the artificial rainfall came from the streamwater, of which sampling during the Floodscale project led to similar values (Bouvier et al, 2018).…”

Le programme HYMEX – Connaissances et prévision des pluies intenses et crues rapides en région méditerranéenne

“…Payrastre et al, 2012 ;Brunet et Bouvier, 2017). Les flux de sub-surface ont été quantifiés, notamment grâce aux essais sur versants sous pluie artificielle ou naturelle et aux analyses géochimiques réalisées (Bouvier et al, 2018). Différents outils de modélisation ont été produits ou améliorés, entre autres pour les bassins versants français : modèle M7 dans la plateforme ATHYS, modèle CVN dans la plateforme LIQUID ® , modèle SIMPLEFLOOD dans la plateforme JAMS, modèle MARINE, modèle ISBA-TOP dans la plateforme SURFEX, générateur stochastique de champs de pluie SAMPO 9 .…”