Uncertainties of cultivated landscape drainage network mapping and its consequences on hydrological fluxes estimations

Florent Levavasseur (1) , Jean-Stéphane Bailly (2) , Philippe Lagacherie (1) , Michael Rabotin (1) , François Colin (1)

1 UMR LISAH - Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème
2 UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale

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

Domaines: Sciences de l'environnement

Florent Levavasseur, Jean-Stéphane Bailly, Philippe Lagacherie, Michael Rabotin, François Colin. Uncertainties of cultivated landscape drainage network mapping and its consequences on hydrological fluxes estimations. Accuracy2010, Jul 2010, Leicester, United Kingdom. p. 153 - p. 157. ⟨hal-00576900⟩