Numerical Analysis of the Influence of Saltwater Intrusion on Qingcaosha Reservoir

A 2D hydrodynamics and salinity numerical model for the Changjiang River Estuary was set up by using Delft3D-Flow. The calculation results agree well with the real measured data, which indicates the model can be used to analyze the salinity in the Changjiang River Estuary. The calculated results of saltwater intrusion in the dry season of dry year shows that the main influence style of the salinity on the water intake of the Qingcaosha reservoir is the saltwater spilling over it from the North Branch during the neap tide and the saltwater intrusion from the open sea through the South Branch during the spring tide. The saltwater spilling over from the North Branch forms a saline water mass near the Xinjian sluice during the late period of a spring tide, which takes 5 days to reach the water intake of the Qingcaosha Reservoir.