Computer models that simulate and quantify geomorphologic processes at different spatial and temporal scales had been developing over recent decades. The use of these models provides information that by the instrumental manner would be too expensive to obtain. For this study the international used model Soil and Water Assessment Tool (SWAT) was used. Characteristics of the model allow the evaluation of different processes, such as the production and export of sediments in river catchment. The simulated scenarios are constructed through a Geographic Information System. The model discriminate s homogeneous units with unique characteristics of substrate, land cover and slope. From these units the model calculates the sediment mobility. In this study the sediment yield produced by a catchment composed mainly by Eocene marls located in the Central Spanish Pyrenees was assessed. Because the nature erodible of the marls the catchment is highly degraded with significant sediment yield and export to the Barasona reservoir.

8 Pags. 2 Tabls. Publicación presentada originalmente en la XII Reunión Nacional de Geomorfología en Santander, 2012.

Este trabajo ha sido financiado por el proyecto EROMED (CGL2O1 1-25486).

Peer reviewed