@article{fdi:010068284,
  title = {{I}nvestigating the role of geology in the hydrological response of {M}editerranean catchments prone to flash-floods : regional modelling study and process understanding},
  author = {{V}annier, {O}. and {A}nquetin, {S}andrine and {B}raud, {I}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this study, a regional distributed hydrological model is used to perform long-term and flash-flood event simulations, over the {C}evennes-{V}ivarais region (south of {F}rance). {T}he objective is to improve our understanding on the role played by geology on the hydrological processes of catchments during two past flash-flood events. {T}his modelling work is based on {V}annier et al. ("{R}egional estimation of catchment-scale soil properties by means of streamflow recession analysis for use in distributed hydrological models", {H}ydrological {P}rocesses, 2014), where streamflow recessions are analysed to estimate the thickness and hydraulic conductivity of weathered rock layers, depending on the geological nature of catchments. {W}eathered rock layers are thus implemented into the hydrological model {CVN}-p, and the contribution of these layers is assessed during flash-flood events simulations as well as during inter event periods. {T}he model is used without any calibration, to test hypotheses on the active hydrological processes. {T}he results point out two different hydrological behaviours, depending on the geology: on crystalline rocks (granite and gneiss), the addition of a weathered rock layer considerably improves the simulated discharges, during flash-flood events as well as during recession periods, and makes the model able to remarkably reproduce the observed streamflow dynamics. {F}or other geologies (schists especially), the benefits are real, but not sufficient to properly simulate the observed streamflow dynamics. {T}hese results probably underline the existence of poorly known processes (flow paths, non-linear spilling process) associated with the planar structure of schisty rocks. {O}n a methodological point of view, this study proposes a simple way to account for the additional storage associated with each geological entity, through the addition of a weathered porous rock layer situated below the traditionally considered upper soil horizons, and shows its applicability and benefits for the simulation of flash flood events at the regional scale.},
  keywords = {{H}ydrological modelling ; {P}rocess understanding ; {F}lash-floods ; {G}eology ; {R}egional modelling ; {FRANCE} ; {LANGUEDOC} ; {ARDECHE} ; {CEVENNES} ; {VIVARAIS} ; {ZONE} {MEDITERRANEENNE}},
  booktitle = {{F}lash floods, hydro-geomorphic response and risk management},
  journal = {{J}ournal of {H}ydrology},
  volume = {541},
  numero = {{P}art {A} {N}o {S}p{\'e}cial},
  pages = {158--172},
  ISSN = {0022-1694},
  year = {2016},
  DOI = {10.1016/j.jhydrol.2016.04.001},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068284},
}