ИСТИНА

A mathematical model has been developed for simulating deformations of river channels composed of heterogeneous alluvium. A combination of shallow-water equations and a three-layer model is used to describe the fluid flow and nonuniform sediment transport in bed (layer II) and suspended (layer III) loads. Changes in the fractional composition of unerodible bottom sediments (layer I) are also considered. The algorithm provides mass conservation for each fraction. The comparison of calculation results and experimental data (hydraulic washing of a desilting basin from sediments and armoring processes in heterogeneous soils) confirms the operability of the model. The model is applied to calculate the silting and hydraulic washes of the reservoir of a hydroelectric power station on a mountain river.