Abstract
In this paper, an algorithm for long-term prediction of dynamic behavior of water and sediment in the basin scale using their physical process models was developed. In the algorithm, a basin is divided into the mountain watershed part and stream channel part and individual flow models are applied. Surface land slides and rainfall-runoff process from the mountain watershed are calculated by the kinematic wave model for subsurface-surface flow and slope stability analysis on a grid-based DEM (Digital Elevation Model). Sediment yield volume resulting from the surface land slides is calculated by slope stability analysis. Sedimentransport and bed variation in the stream channel can be predicted by debris flow, bed-load, suspended-load and wash-load formulae. The new method was verified by applying to Yahagi-dam basin, Japan.
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