In this project we tested and compared two landscape evolution models with simple model structure: LAPSUS and Watem LT.
Model calibrations and validations are performed within the Nodebais catchment (103 ha) and the Hamme-Mille catchment (64 ha), where intensive soil augerings have provided detailed data to evaluate long-term spatial patterns of erosion and deposition along two transects. The 2D model calibration and validation are performed within Nodebais, while for the 3D model calibration Nodebais was used and for the 3D model validation Hamme-Mille. Simulations are performed forward in time on a two-dimensional transect for four resolutions, and backward in time for the whole catchments three-dimensionally at 20 m resolution.
In 2D, all models perform very well on all resolutions, resulting in Model Efficiency Factors (MEF) of 0.92 to 0.99 for calibration and 0.77 to 0.96 for validation. Especially LAPSUS reproduces good patterns of erosion and deposition. For both models parameter values on different resolutions are similar, which is an indication of small scale dependency of the models.
WaTEM LT performs equally well in 3D, resulting in a class-based MEF of 0.88 and 0.68 for calibration and validation, respectively. LAPSUS performs well for the calibration (MEF of 0.87), but was unable to execute a successful validation caused by technical anomalies related to backward modelling. The transport limited approach produced unrealistic results after application in 3D.
- Peeters, I., Temme, A., Buis, E., G. Govers and Veldkamp, A., in preparation. Comparison of two landscape evolution models in the Belgium Loess belt.
- Peeters, I., Rommens, T., Verstraeten, G., Govers, G., Van Rompaey, A., Poesen, J. van Van Oost, K. 2006. Reconstructing ancient topography through erosion modelling. Geomorphology, 78(3-4): 250-264.
» more LAPSUS Publications.
- +31 (0) 3174 84445;
- Room B124, Gaia
Ir. Eke Buis
- +31 (0) 3174 84871;
- Room B124, Gaia
Ir. Iris Peeters KU Leuven
Prof. Dr. G. Govers KU Leuven