Rossi L. M. W. auteur aut IRD Rapidel B. auteur aut IRD Roupsard O. auteur aut IRD Villatoro-sanchez M. auteur aut IRD Mao Z. auteur aut IRD Nespoulous J. auteur aut IRD Perez Jérôme auteur aut IRD Prieto I. auteur aut IRD Roumet C. auteur aut IRD Metselaar K. auteur aut IRD Schoorl J. M. auteur aut IRD Claessens L. auteur aut IRD Stokes A. auteur aut IRD text journalArticle eng text/pdf born digital access The influence of vegetation on slope stability is well understood at the slope level but scaling up to the catchment level is still a challenge, partially because of a lack of suitable data to validate models. We tested the physical landslide model, LAPSUS_LS, which models slope stability at the catchment scale. LAPSUS_LS combines a hydrological model with a Limit Equilibrium Method model, and calculates the factor of safety of individual cells based on their hydrological and geomorphological characteristics. We tested two types of vegetation on slope stability: (i) coffee monoculture (Coffea arabica) and (ii) a mixed plantation of coffee and deep rooting Erythrina (Erythrina poeppigiana) trees. Using soil and root data from Costa Rica, we performed simulations to test the response of LAPSUS_ LS to root reinforcement, soil bulk density, transmissivity, internal friction angle and depth of shear plane. Furthermore, we modified the model to include biomass surcharge effect in the calculations. Results show that LAPSUS_ LS was most sensitive to changes in additional cohesion from roots. When the depth of the shear plane was fixed at 1.0 m, slopes were not unstable. However, when the shear plane was fixed to 1.5 m, the mixed plantation of coffee and trees stabilized slopes, but the coffee monoculture was highly unstable, because root reinforcement was low at a depth of 1.5 m. Soil transmissivity had a limited impact on the results compared to bulk density and internal friction angle. Biomass surcharge did not have any significant effect on the simulations. In conclusion, LAPSUS_ LS responded well to the soil and vegetation input data, and is a suitable candidate for modeling the stability of vegetated slopes at the catchment level. specialized Modeling Cohesion Roots Soil Transmissivity Bulk density Slope stability COSTA RICA 082 062 064 020 Hubble T. ed. edt IRD Clarke S. ed. edt IRD Stokes A. ed. edt IRD Phillips C. ed. edt IRD 109 Part B - No Spécial 249-255 2017 0925-8574 SBEE 2016 : International Conference, 4., Sydney (AUS), 2016/07 https://www.documentation.ird.fr/hor/fdi:010071985 10.1016/j.ecoleng.2017.08.010 0925-8574 [F B010071985] https://www.documentation.ird.fr/hor/fdi:010071985 https://www.documentation.ird.fr/intranet/publi/2018/01/010071985.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-02-05 2023-07-11 fdi:010071985 fre