Abstract
The LImburg Soil Erosion Model (LISEM) is a physically-based hydrological and soil erosion model, which can be used for research, planning and conservation purposes in drainage basins. Processes incorporated in the grid-based LISEM model are rainfall, interception, surface storage in micro-depressions, infiltration, vertical movement of water in the soil, overland flow, channel flow, detachment by rainfall and throughfall, detachment by overland flow, and transport capacity of the flow. Also, the influence of tractor wheelings, small paved roads (smaller than the pixel size), stones and surface sealing on the hydrological and soil erosion processes is taken into account. Vertical movement of water in the soil is simulated using the Richards equation. Optionally, the user can choose a one or two layer Green and Ampt or the Holtan infiltration model as an alternative to Richards. LISEM is completely incorporated in a raster Geographical hnformation System. From the first validation results it is clear that, although the model has several advantages over other models and the qualitative erosion and runoff patterns appear plausible, the quantitative prediction of erosion and discharge is still far from perfect.
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