In this paper, 2 topographic indices, closely related to mathematical expressions suggested by different AA. are used to characterize the influence of watershed topography on gully erosion. The AS1 index is defined as the product of watershed area
Belgium ; Digital elevation model ; Holocene ; Loess ; Model ; Palaeogeography ; Palaeogeomorphology ; Soil erosion ; Topography ; Watershed
The AA. 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. The model is spatially evaluated, using detailed estimates for historical soil
. The large regional, local and even temporal variability in the trend between A and SSY implies that prediction of SSY based on A alone is troublesome and preferably spatially distributed information on land use, climate, lithology, topography and dominant
Densité de population ; Distribution spatiale ; Erodabilité ; Erosion des sols ; Occupation du sol ; Plaine ; Plateau ; Propriétés du sol ; Ravinement ; Rugosité ; Seuil ; Tanzanie ; Topographie ; Unité paysagique
Erodibility ; Gully erosion ; Land utilisation ; Landscape unit ; Plain ; Plateau ; Population density ; Roughness ; Soil erosion ; Soil properties ; Spatial distribution ; Tanzania ; Threshold ; Topography
Etude de quelques bassins-versants, à partir de photos aériennes, afin d'analyser l'importance relative de l'érosion par des ravines temporaires, localisées dans des emplacements prédéterminés par la topographie. Les résultats montrent que l'érosion
in SSY is made using a quantitative and a semiqualitative approach for 22 catchments characterised by topography, vegetation cover, lithology, shape and the presence of gullies in the broad vicinity of the reservoir. This information is used to develop
and geology, topography and land use was investigated. Based on a review of historical archives and on soil augerings, the origin of the CDs was reconstructed. In addition, the infilling of one CD was studied in detail to determine the mean erosion rate since