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Modélisations numérique et expérimentale du ruissellement. Effet de la rugosité sur les distances de transfert

Abstract : Soil surface morphology affects overland flow and vice versa. The goal of this study was to gain new insights into control mechanisms and their interactions. Attention is focused on sheetflow in inter-rill areas. A numerical model, based on a conditioned walker technique, is used. Effects of water surface storage on overland flow generation are analysed. Generation of overland flow is described as a development of connections between depressions. Being similar to a percolation process, a formal description of system size on the dynamics of overland flow is performed. Numerically generated surfaces enable one to examine external dynamics (using a runoff coefficient) and internal dynamics (using a transfer distance). The water transfer distance is a relevant measurement to understand system behaviour. This cannot be achieved if only the runoff coefficient is measured. Effects of the different kinds of roughness depend mainly on their amplitudes. Short-range correlation does not affect connection development. Driving particle redistribution, overland flow causes non-obvious modifications of surface geometry. Processes able to modify local morphology have the strongest consequences on overland flow generation. However, usual methods do not characterise such modifications. Applied to water and particle transfers, the redistribution of dissolved matter is also studied.
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Contributor : Frédéric Darboux <>
Submitted on : Thursday, January 13, 2011 - 5:39:25 PM
Last modification on : Thursday, January 14, 2021 - 11:47:25 AM
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  • HAL Id : tel-00555562, version 1


Frédéric Darboux. Modélisations numérique et expérimentale du ruissellement. Effet de la rugosité sur les distances de transfert. Hydrologie. Université Rennes 1, 1999. Français. ⟨tel-00555562⟩



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