Reconstructing ancient topography through erosion modelling |
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Authors: | Iris Peeters Tom Rommens Gert Verstraeten Gerard Govers Anton Van Rompaey Jean Poesen Kristof Van Oost |
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Institution: | aKatholieke Universiteit Leuven, Physical and Regional Geography Research Group, Geo-Institute, Celestijnenlaan 200E, B-3001 Heverlee, Belgium;bUniversity of Exeter, Hydrology and Earth Surface Processes Research Group, Amory Building Rennes Drive, Exeter EX4 4RJ, United Kingdom |
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Abstract: | One of the main aims of geomorphology is to understand how geomorphic processes change topography over long time scales. Over the last decades several landscape evolution models have been developed in order to study this question. However, evaluation of such models has often been very limited due to the lack of necessary field data. In this study we present a topography based hillslope erosion and deposition model that is based on the WATEM/SEDEM model structure and works on a millennial time scale. Soil erosion, transport and deposition are calculated using slope and unit contributing area. The topography is iteratively rejuvenated by taking into account modelled erosion and deposition rates, thereby simulating topographic development backwards in time. A first attempt has been made to spatially evaluate the model, using detailed estimates for historical soil erosion and sediment deposition volumes, obtained from an augering campaign in a small catchment in the Belgian Loess Belt. The results show that the model can simulate realistic soil redistribution patterns. However, further research is necessary in order to deal with artificial flaws that cause routing problems and significantly influence results. Common problems and issues related to this type of backward modelling are also discussed. |
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Keywords: | Erosion modelling Landscape evolution Model calibration Late Holocene DEM |
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