秦皇岛海域洪季水动力及污染物扩散数值模拟

Numerical Simulation of Hydrodynamics and Pollutant Transport in Qinhuangdao Coastal Water in the Flood Season

基于实测资料验证的秦皇岛近岸海域二维水动力和污染物扩散模型,研究了秦皇岛近岸海域洪季大潮水文条件下的水动力和污染物扩散分布特征,并在此基础上分析了风对秦皇岛近岸海域水动力和污染物扩散的影响.研究发现,秦皇岛近岸海域落潮流为东北(NE)向,涨潮流为西南(SW)向.在渤海夏季风作用下,秦皇岛近岸海域整体水位略有降低;落憩时刻,石河口以北海域流速降低,石河口以南海域流速增加;涨憩时刻,石河口以北海域流速略有增加,戴河口至滦河口间海域流速降低.化学需氧量(COD)扩散方向与涨落潮方向一致,涨落憩时刻,COD浓度均在滦河口以南海域降低,洋河口以北海域增加.

A 2D hydrodynamics and pollutant transport model was firstly established, and the model was verified well by the field measured hydrodynamics and water quality data in 2011. Based on this model, the features of hydrodynamics and pollutant transport during a spring tide in the flood season in Qinhuangdao coastal water were studied. Furthermore, the influence of wind on hydrodynamics and pollutant transport in Qinhuangdao coastal water was analyzed. Numerical results show that the main direction of the ebb current is northeast, while the direction of the flood current is southwest. The water level of Qinhuangdao coastal water will slightly decrease under the influence of summer wind in Bohai sea. Meanwhile, the current velocity will decrease in the northern coastal water of Shihe River estuary and increase in the southern coastal water of Shihe River estuary at the slack of ebb, while the current velocity will slightly increase in the northern coastal water of Shihe River estuary and decrease in the coastal water between Daihe River estuary and Luanhe River estuary at the slack of flood. The direction of COD transport is in accord with the direction of tidal current. The COD concentration will decrease in the southern coastal water of Luanhe River estuary and increase in the northern coastal water of Yanghe River estuary at the slacks of ebb and flood.