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Sensitivity of the landslide model LAPSUS_LS to vegetation and soil parameters

Lorenzo MW Rossi; Bruno Rapidel; Olivier Roupsard; Mario Villatoro-Sanchez; Zhun Mao; Jerome Nespolous; Jerome Perez; Ivan Prieto; Catherine Roumet; Klaas Metselaar; Jerome Schoorl; Lieven Claessens; Alexia Stokes


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    <dct:title>Sensitivity of the landslide model LAPSUS_LS to vegetation and soil parameters</dct:title>
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    <dcat:keyword>Modeling</dcat:keyword>
    <dcat:keyword>Cohesion</dcat:keyword>
    <dcat:keyword>Roots</dcat:keyword>
    <dcat:keyword>Soil</dcat:keyword>
    <dcat:keyword>Transmissivity</dcat:keyword>
    <dcat:keyword>Bulk density</dcat:keyword>
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    <dct:description>&lt;p&gt;The influence of vegetation on slope stability is well understood at the slope level but scaling up to the catchment&lt;br&gt; level is still a challenge, partially because of a lack of suitable data to validate models. We tested the physical&lt;br&gt; landslide model, LAPSUS_LS, which models slope stability at the catchment scale. LAPSUS_LS combines a hydrological&lt;br&gt; model with a Limit Equilibrium Method model, and calculates the factor of safety of individual cells&lt;br&gt; based on their hydrological and geomorphological characteristics. We tested two types of vegetation on slope&lt;br&gt; stability: (i) coffee monoculture (Coffea arabica) and (ii) a mixed plantation of coffee and deep rooting Erythrina&lt;br&gt; (Erythrina poeppigiana) trees. Using soil and root data from Costa Rica, we performed simulations to test the&lt;br&gt; response of LAPSUS_LS to root reinforcement, soil bulk density, transmissivity, internal friction angle and depth&lt;br&gt; of shear plane. Furthermore, we modified the model to include biomass surcharge effect in the calculations.&lt;br&gt; Results show that LAPSUS_LS was most sensitive to changes in additional cohesion from roots. When the depth of&lt;br&gt; the shear plane was fixed at 1.0 m, slopes were not unstable. However, when the shear plane was fixed to 1.5 m,&lt;br&gt; the mixed plantation of coffee and trees stabilized slopes, but the coffee monoculture was highly unstable,&lt;br&gt; because root reinforcement was low at a depth of 1.5 m. Soil transmissivity had a limited impact on the results&lt;br&gt; compared to bulk density and internal friction angle. Biomass surcharge did not have any significant effect on&lt;br&gt; the simulations. In conclusion, LAPSUS_LS responded well to the soil and vegetation input data, and is a suitable&lt;br&gt; candidate for modeling the stability of vegetated slopes at the catchment level.&lt;/p&gt;</dct:description>
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