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为研究污染物离岸排放的输移扩散规律及影响因素,本文基于MIKE21软件构建了渤海和黄海北部海域的数学模型,采用水动力模块对海域潮流进行数值模拟,通过对排污口海域网格逐层加密,模拟了芝罘岛海域的潮流场,并与实测潮流资料进行对比,验证了模型的合理性。在此基础上耦合输移扩散模块,模拟了污染物COD在不同环境条件下的输移扩散现象,并研究对比了风场和源项对离岸排放污染物的输移扩散产生的影响。结果表明,风场改变了污染物离岸输移扩散的速度和方向;在排污区域附近,线源比点源更有利于污染物的离岸输移扩散。
In order to study the rules of transport and diffusion of offshore pollutant emissions and its influencing factors, this paper constructs the mathematical model of Bohai Sea and northern Yellow Sea based on MIKE21 software, and uses the hydrodynamic module to simulate the tidal current in the sea. Layer encryption to simulate the tidal current field of Zhifu Island sea area, and compared with the measured tidal current data to verify the rationality of the model. On the basis of this, coupling diffusion module is simulated and the transport and diffusion of pollutant COD under different environmental conditions are simulated. The effects of wind field and source term on the transport and dispersion of offshore pollutants are studied. The results show that the wind field changes the speed and direction of the pollutant’s offshore migration and diffusion. In the vicinity of the sewage area, the source of the source is more favorable than the point source for the offshore migration of pollutants.