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Les observatoires du ruissellement : comprendre les processus pour améliorer les modélisations

Abstract : Runoff events are usually very concentrated in both space and time, and are therefore challenging to monitor. They result from the interactions of rainfall characteristics with both soil surface and intrinsic characteristics and catchment morphology. To improve our understanding of this complex process, five observatories were installed to monitor the runoff response of eleven catchments to natural rainfall events. Measurements were performed with a high frequency (≤ 15 min-time step) and over long time periods (1.5 to 11 years). 1640 rainfall-runoff events were extracted from rainfall and discharge time series. Statistical analyses were performed in order to determine significant triggering factors. The rainfall-runoff response of each catchment is highly variable, but some common features were identified across contrasted catchments. Under highly variable soil types, the catchment runoff exhibited contrasted patterns. Soil surface state, and land use were demonstrated to highly affect runoff. The scattering in the rainfall-runoff relationship demonstrated the key role of the initial soil moisture and rainfall characteristics. Lessons learnt from previous studies in these various environments, as well as their consequences on runoff understanding and modelling are discussed.
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Submitted on : Monday, March 8, 2021 - 7:43:22 AM
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GrangeonEtAl2020_LHB.pdf
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Thomas Grangeon, Olivier Cerdan, Valentin Landemaine, Rosalie Vandromme, Jean-François Desprats, et al.. Les observatoires du ruissellement : comprendre les processus pour améliorer les modélisations. La Houille Blanche - Revue internationale de l'eau, EDP Sciences, 2020, pp.7-16. ⟨10.1051/lhb/2020056⟩. ⟨cea-03161717⟩

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