Gumière S. J. auteur aut IRD Raclot Damien auteur aut IRD Cheviron B. auteur aut IRD Davy G. auteur aut IRD Louchart X. auteur aut IRD Fabre J. C. auteur aut IRD Moussa R. auteur aut IRD Le Bissonnais Y. auteur aut IRD text journalArticle eng text/pdf born digital access In this paper, we present MHYDAS-Erosion, a dynamic and distributed single-storm water erosion model developed as a module of the existing hydrological MHYDAS model. As with many catchment erosion models, MHYDAS-Erosion is able to simulate sediment transport, erosion and deposition by rill and interrill processes. Its originality stems from its capacity to integrate the impact of land management practices (LMP) as key elements controlling the sedimentological connectivity in agricultural catchments. To this end, the water-sediment pathways are first determined by a specific process-oriented procedure defined and controlled by the user, which makes the integration of LMP easier. The LMP dynamic behaviours are then integrated into the model as a time-dependent function of hydrological variables and LMP characteristics. The first version of the model was implemented for vegetative filters and tested using water and sediment discharge measurements at three nested scales of a densely instrumented catchment (Roujan, OMERE Observatory, southern France). The results of discharge and soil loss for simulated rainfall events have been found to acceptably compare with available data. The average R-2 values for water and sediment discharge are 0.82 and 0.83, respectively. The sensitivity of the model to changes in the proportion of LMP was assessed for a single rain event by considering three scenarios of the Roujan catchment management with vegetative filters: 0% (Scenario 1), 18% (Scenario 2, real case) and 100% (Scenario 3). Compared to Scenario 2 (real case), soil losses decreased for Scenario 3 by 65% on the agricultural plot scale, 62% on the sub-catchment scale and 45% at the outlet of the catchment and increased for Scenario 1 by 0% on the plot scale, 26% on the sub-catchment scale and 18% at the outlet of the catchment. specialized erosion modelling sedimentological connectivity modelling land management practice 062 068 25 11 1717-1728 2011 0885-6087 https://www.documentation.ird.fr/hor/fdi:010053609 10.1002/hyp.7931 0885-6087 [F B010053609] https://www.documentation.ird.fr/hor/fdi:010053609 https://www.documentation.ird.fr/intranet/publi/2011/06/010053609.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-07-01 2017-08-23 fdi:010053609 fre