Study on prediction of riverbed erosion and deposition at tail of Ganjiang River

Abstract

The trend of a river erosion and deposition is the first construction condition for a bridge construction. In order to evaluate the construction conditions of a bridge located at the end of Ganjiang River, based on the two-dimensional flow and sediment mathematical model, the amount and distribution of sediment erosion and deposition in the river reach under various typical and series of annual flow and sediment processes were calculated and analysed in this paper. The results show that the river reach where the project is located is dominated by micro siltation under various water and sediment processes, but the unfavourable conditions caused by local scour of piers should be considered in the construction of the project.

Combined method for calculating the total erosion of channels composed of easily erodible grounds

“…The nature of channel deformations changes as a result of anthropogenic action, after the regulation of the flow by water support structures -dams. In the in the upstream of the hydrounite, the processes of siltation of the reservoir begin due to a decrease in flow rates and, accordingly, the transporting capacity [14,15]. In the downstream of the hydrocomplex, the predominant type of channel processes is the general erosion [16,17,18].…”

“…All existing calculation methods can be separated: 1) hydrodynamic (theoretical) methods that are based on solving a system of equations of a suspended channel flow in a deformable channel [2,10,13,14,15].…”