Influencia de la litología en los procesos de erosión en badlands. Los casos de Anna (Valencia) y Petrer (Alicante)

Abstract

By means of experiments with simulated rainfall the hydrological and erosional behaviour of degraded surfaces (badlands) developed on two different parent materials (marls and clays) is studied. On the Keuper clays, the ponding (4'07") and runoff (6' 36") initiation is delayed, the infiltration rates (38.63 mm h^-1) are high, and the runoff coefficient (11.2 % after 30 minutes and 19.4 % after 60 minutes) and the erosion rates (13 g m² h^-1) are low. On the contrary, over Cretaceous marls, the ponding (1’ 37") and the surface runoff (2' 52") initiation is very rapid, the infiltration rates are low (11.2 mm h^-1), and the runoff coefficient (64.7 % after 30 minutes and 72.2 % after 60 minutes) and the erosion rates (2,198 g m² h^-1) are very high. The activity of the surface runoff on the badlands over marls results in very low possibilities of soil and vegetation cover regeneration.