岸线变化对天津近岸海域污染物输移扩散影响研究

Study on impact of shoreline changes on pollutant transport and dispersion in Tianjin coastal waters

应用MIKE21数学模型对天津近岸海域潮流场进行数值模拟,同时考虑天津近岸海域5个典型河口污染物输入的影响,计算了大小潮作用下COD输移扩散范围,并研究了岸线变化对COD输移扩散范围的影响。结果表明,岸线的变化对北塘口及天津港附近COD的输移扩散有较大影响。岸线变化后,大小潮高低潮时刻对应的0.001 mg/L浓度等值线范围均比岸线变化前小。

The MIKE21 numerical model was applied to simulate the tidal current field in Tianjin coastal waters.On this basis,considering the pollutants input of five typical estuaries in Tianjin coastal waters,the COD transport and diffusion range under the action of spring tide and neap tide was calculated.Then the effects of shoreline changes on COD transport and diffusion were analyzed.The results show that shoreline changes have greater impact on COD transport and diffusion range near Beitang estuary and Tianjin port.After the change of the shoreline,the 0.001 mg/L concentration isoline range at the high and low tide of spring tide and neap tide is smaller than before.