Prévision du transport solide sur un bassin versant. Application à l'envasement d'une retenue

Sediment transport prediction from a watershed. Application to reservoir silting

Ecole Nationale d'Ingénieurs de Tunis

Abstract

This paper presents a numerical model enabling the estimation of the quantities of sediments transported from a watershed. The latter is subdivided into sub-watersheds composed of two sides drained by one single channel. For each sub-watershed the liquid mass is routed first on the two sides then along the channel, afterwards suitable sediment transport formulas are introduced to rout the sediments. An assemblage program manages the flow through all the watershed. The model takes into account its topography, the sediment size of its soils, the ground cover density and the hydrological data. The model gives good results compared to silting surveys made on a reservoir of the north of Tunisia.