Quasi-3D numerical simulation of salinity transport for reservoir initial impoundment

In the special geological and water environment of estuarine reservoirs, salt water in the deposits will intrude into the overlying freshwater and affect the water quality and normal operation of the reservoir. It is, therefore, important to identify the spatial extent of salt. Based on site survey, drilling and laboratory data, a quasi-3D model was established, simulating the migration of salt in the initial impoundment of the reservoir. As a result, if the impoundment happened in the normal water year, when the water level rose to 0.5m, salinity ranged from 0.3g/L to 2.8g/L on the surface; at the level of 1.5m, salinity ranged from 0.3g/L to 1.3g/L; and at the level of 4.5m, salinity varied between 0.3g/L and 1.55g/L. This will lead to a better understanding of the implications of groundwater hydrology and improve protection of surface water quality during the extraction of water resources.