(Erosion Prediction in Ungauged Basins: Integrating Methods and Techniques (Proceedings of Symposium HS01 held during IUGG2003 at Sapporo, July 2003), IAHS Publication No. 279, 2003, pp. 79–83).
A model was developed for estimating soil erosion by flowing water in ungauged watersheds from four parameters: slope; annual rainfall; clay content; and vegetation cover. The mathematical model is: soil erosion (t ha−1) = 41.73 + 0.181 x slope (%) + 0.046 x rainfall (cm) – 0.387 x clay (%) – 8.125 x vegetation cover factor. The vegetation cover was ranked on a scale of 1 to 5, 1 being bare soil surface, and 5 the extremely dense forests with trees, bushes and grasses. The mode was applied to the data obtained from gauged watersheds during subsequent years for validity and was found quite effective in estimating soil erosion by water. However, further investigations are required to refine the model. Furthermore, because the gauged watersheds comprise only a minute fraction of the total ungauged area of the region, estimating soil erosion estimation necessitates spatial extrapolation on a spatial and temporal basis.
Mathematical model, Partial regression, Prediction, Soil erosion, Vegetation cover
