Application of the EROSION 3D model to the CATSOP watershed, The Netherlands

This paper describes the application of the EROSION 3D soil erosion model t o the CATSOP catchment in the Netherlands using data of 10 storms from the period of 1987 to 1993. Based on observed runoff data the model was calibra ted by adjusting initial soil moisture. The computations result in a raster map showing the spatial pattern of predicted erosion and deposition within the catchment. The map corresponds qualitively well with reality. For a qu antitative evaluation, the model results were compared with observed sedime nt data measured at the channel when it leaves the catchment. The compariso n shows that simulated soil loss was generally too high. This discrepancy m ight be caused by weak input data and the presence of processes-such as ero sion and deposition within the channel-which are not covered by the model. (C) 1999 Elsevier Science B.V. All rights reserved.