Effect of hydrodynamic behaviour of clayey soils on the risks of runoff and soil erosion: case of soils of the Mediterranean mountains of Beni-Chougrane-Algeria

摘要

Alternating drought - hydration of soils results in a particular hydrodynamic behaviour of clayey soils and therefore the risk of mass movement and erosion. This study allowed understanding this dynamics by monitoring the structural evolution and infiltration on the one hand and by studying the effect of this particular behavior on the risk of runoff and erosion using rainfall simulation. The results have shown the influence of antecedent moisture conditions, intensity of rainfall and soil surface characteristics on the hydrodynamic behaviour. Clay soils are characterized by a very low infiltration when the soil is moist and a high infiltration when the soil is dry (preferential flow by shrinkage cracks).