Earth surface processes and landforms vol:33 issue:11 pages:1639-1660
Soil erosion models are essential tools for the successful implementation of effective and
adapted soil conservation measures on agricultural land. Therefore, models are needed that
predict sediment delivery and quality, give a good spatial representation of erosion and
deposition and allow us to account for various soil conservation measures.
Here, we evaluate how well a modified version of the spatially distributed multi-class
sediment transport model (MCST) simulates the effectiveness of control measures for different
event sizes. We use 8 year runoff and sediment delivery data from two small agricultural
watersheds (0·7 and 3·7 ha) under optimized soil conservation. The modified MCST model
successfully simulates surface runoff and sediment delivery from both watersheds; one of
which was dominated by sheet and the other was partly affected by rill erosion. Moreover,
first results of modelling enrichment of clay in sediment delivery are promising, showing the
potential of MCST to model sediment enrichment and nutrient transport.
In general, our results and those of an earlier modelling exercise in the Belgian Loess Belt
indicate the potential of the MCST model to evaluate soil erosion and deposition under different
agricultural land uses. As the model explicitly takes into account the dominant effects
of soil-conservation agriculture, it should be successfully applicable for soil-conservation
planning/evaluation in other environments.