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通过采用平面二维水动力水质模型,以CODMn作为污染指标用来模拟灌河口近岸海域COD浓度的变化情况及污染物的迁移扩散规律,并利用实测资料对模拟结果进行验证。研究结果表明,水动力模拟的结果能满足污染物扩散的水动力条件,水质模块计算的结果也能真实的反映灌河口COD的浓度变化状况。在一个潮周期内,污染物的扩散受潮流的影响较大,落潮阶段污染物的扩散作用较涨潮阶段明显,落潮阶段COD浓度范围大,浓度梯度小,涨潮阶段与之相反。COD浓度的高值区在落潮阶段位于燕尾港附近,涨潮时则迁移至河道内,且落憩时浓度高值区的范围较涨憩时大,浓度值也较高。
By using the planar two-dimensional hydrodynamic water quality model, CODMn was used as a pollution indicator to simulate the changes of COD concentration in coastal waters and the rules of migration and diffusion of pollutants. The simulation results were verified by the measured data. The results show that the hydrodynamic simulation results can meet the hydrodynamic conditions of pollutant diffusion, and the results calculated by the water quality module can also truly reflect the COD concentration changes in the irrigation estuary. In a tidal cycle, the diffusion of pollutants is greatly affected by tidal current. The diffusion of pollutants during the tide stage is more significant than that during the tidal periods. The range of COD concentrations is large during the tide stage, and the concentration gradient is small. The high COD concentration zone was located near Dovetail Harbor during the tide ebb and the river channel during high tide, and the range of high concentration zone was larger and the concentration was higher at the time of rest.