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Analysis of the impact of erosion on agricultural landscape evolution: landsoil model development and sensitivity analysis

Abstract : Modelling is an appropriate methodology for understanding space-time evolution in soil and landscape processes. Such modelling presumes the ability to produce quantitative models of soil redistribution in the landscape to test the effects of different scenarios of land management and climate evolution. The LandSoil model (Landscape design for Soil conservation under soil use and climate change) is designed for the analysis of agricultural landscape evolution at a fine spatial resolution scale [1-10 meters] and a mid-term temporal scale [10-100 years]. Based on the Stream model, LandSoil is suitable for simulations from parcel to catchment scale. It is spatially distributed, event-based, and considers water and tillage erosion processes. Specificity of the model is the use of a dynamic representation of the agricultural landscape through parameters such as a monthly representation of soil surface properties, hydrologic pathways and accounting a climate component based directly on rainfall events. We present the characteristics of the model, sensitivity analysis to the main erosion processes parameters and its application to a scenario study on a Mediterranean site. Sensitivity analysis shows the importance both of soil surface properties and flow connectivity on catchment soil redistribution, allowing make decisions and planning soil and water conservation strategies. Catchment scale simulations on a degraded scenario, maximising the hydraulic conductivity whit the removal of all the grass bands between fields, indicate a global increase of the soil erosion rate (+29%), with spatial variability depending on the specific soil use type and a significant loss of trapping efficiency at field borders (-81%).
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https://hal.inrae.fr/hal-02745516
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Submitted on : Wednesday, June 3, 2020 - 8:48:57 AM
Last modification on : Wednesday, November 11, 2020 - 7:42:03 PM

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  • HAL Id : hal-02745516, version 1
  • PRODINRA : 268498

Citation

Rossano Ciampalini, Stéphane Follain, Yves Le Bissonnais. Analysis of the impact of erosion on agricultural landscape evolution: landsoil model development and sensitivity analysis. 4. International Congress EUROSOIL 2012, Jul 2012, Bari, Italy. 2696 p. ⟨hal-02745516⟩

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