Author:
Zhang Hui,Meng Hui,Zhang Xueqing
Abstract
Wanning Xiaohai is the largest lagoon in Hainan Province. In recent years, the body of water in Xiaohai has been polluted due to the untreated discharge of domestic sewage and aquaculture tailwater directly into Xiaohai. In order to improve the water quality of Xiaohai and relieve the pressure on the water environment, it was decided to restore the tidal inlet of Xiaohai. In this study, the water quality module of the finite volume ocean model was applied to simulate the change of pollution concentration using the Eulerian advection diffusion equation to analyze the half life time and tidal prism before and after the restoration project of the Wanning Xiaohai tidal inlet. The research results showed that after the restoration of the tidal inlet, the half life time of Xiaohai water body changed from 64 d to 58 d, shortened by 6 d, and the tidal prism increased from 8.8×106 m3 to 9.6×106 m3, which can well enhance the exchange between Xiaohai and external water bodies, improve the water quality of Xiaohai and relieve the pressure of water environment.