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Connectivité hydro-sédimentaire dans un petit bassin versant agricole du nord-ouest de la France : de l’expertise de terrain à la modélisation par Système Multi-Agent

Abstract : The hydro-sedimentary fluxes that take place on the hillslopes significantly impact the different components of hydrosystems (soil erosion, water pollution, flooding, etc.). In low-energy hydrosystems, such as in northwestern France, to understand these dynamics, we first need to look at the respective roles of each landscape entities (agricultural plot, hedge, ditch, etc.) and the interactions they generate with hydro-sedimentary fluxes. In this paper we propose two complementary approaches (computational modeling and geomorphology) to better understand the relationships between the landscape structure and the hydro-sedimentary fluxes. In a first approach, a model is developed and based upon the Multi-Agents System (SMA) in order to measure the impact of the landscape structure on the structural connectivity between production areas and rivers. The first results show the relevance of such a tool for a better understanding of hydro-sedimentary processes/landscape interactions and opens perspectives for the evaluation of functional connectivity. The latter is here described by a quantification of the hydro-sedimentary fluxes during different episodes of runoff. This work took place on a small Norman farming catchment (17.6 km²). The results of this geomorphological approach reveal the influence of some hydrological thresholds, the availability of sedimentary stocks and the effects of scales, the understanding of which is a key requirement in order to better understand functional connectivity.
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https://hal.archives-ouvertes.fr/hal-01686210
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Submitted on : Wednesday, January 17, 2018 - 10:34:56 AM
Last modification on : Sunday, March 29, 2020 - 1:41:57 AM

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  • HAL Id : hal-01686210, version 1

Citation

Romain Reulier, Daniel Delahaye, Vincent Viel, Robert Davidson. Connectivité hydro-sédimentaire dans un petit bassin versant agricole du nord-ouest de la France : de l’expertise de terrain à la modélisation par Système Multi-Agent. Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2018, 23 (4/2017), pp.327-340. ⟨hal-01686210⟩

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