上海市污水排放口污染物运动轨迹模拟

Numerical simulation on pollutant tracking released from the sewerage outfalls in Shanghai

利用Delft3D数学模型,对上海市现有及拟建排放口排放的污染物运动轨迹进行了模拟。从模拟结果看,诸排放口释放的示踪浮子虽沿岸向下游漂移,但没直接流向岸边,不会直接污染岸滩;浮子最终流向杭州湾方向,上海的污水排放应综合杭州湾的水环境容量考虑;丰水期自竹园、白龙港和新和排放口释放的示踪浮子能较快输移至计算边界,但石洞口排放口于丰水期、4处排放口于枯水期释放示踪浮子要在长江口内盘桓5到10日以上才能输移至计算边界外,建议综合长江口环境容量和排放口的稀释、扩散和降解作用等因素,适当处理污水后外排,并根据排放口的位置及季节调整相应的污水处理等级,以保护长江口及杭州湾的水环境。

The authors undertook 2D numerical simulations of the pollutant drogues tracking released form the existing and proposed sewerage outfalls in Shanghai by using Delft 3D model.The results showed the drogues released from 4 outfalls would not move to the shore though they would drift downstream near the shoreline and the drift materials would not pollute the shore.The drogues eventually left the model boundary towards the Hongzhou Bay.The drogues released from 3 outfalls moved out of the computational domain in 2 or 3 days in wet season,while the drogue released from the 4shidongkou outfall in wet season and from all 4 outfalls in dry season took 5-10days or more to leave the computational domain.It was suggested that in the sewerage building planning of Shanghai the selfpurification capacity of the Hangzhou Bay and the Yangtze Estuary should be considered.The sewage should be treated properly before discharging.The treatment degree should be regulated according to the outfall positions and seasons in order to protect the water environment in Yangtze Estuary and Hangzhou Bay.