Uncertainties of cultivated landscape drainage network mapping and its consequences on hydrological fluxes estimationsReport as inadecuate




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1 LISAH - Laboratoire d-étude des interactions entre sols, agrosystèmes et hydrosystèmes 2 UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale

Abstract : In this study, we use a network generation method to simulate equi-probable artificial drainage networks on a small Mediterranean cultivated catchment. The method consists in a stochastic algorithm assimilating sampled observations on the network that generates a ditch network based on the map of field boundaries. A set of one hundred simulations is used to represent the uncertainty on the ditch network. With regards to geometrical lengths indices, and topographical metrics slope indices, simulations similarities compared to the real network are computed. Secondly, uncertainty on the network is propagated through the hydrological model MHYDAS. The induced hydrological responses in hydrographs present a variability that can be linked to previous networks metrics. At this stage of the network generation process, this uncertainty propagation study allows to drive the choice of criteria for future network generation process improvement.

Mots-clés : TELEDETECTION RESEAU HYDROGRAPHIQUE RUISSELLEMENT CARTOGRAPHIE PAYSAGE CULTIVE INCERTITUDE ARTIFICIAL DRAINAGE NETWORK DIRECTED TREE UNCERTAINTIES MAPPING ERROR PROPAGATION HYDROLOGICAL RESPONSE





Author: F. Levavasseur - Jean-Stéphane Bailly - P. Lagacherie - M. Rabotin - F. Colin -

Source: https://hal.archives-ouvertes.fr/



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