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应用Mike 21软件建立了北戴河海域水动力与污染物输运数学模型,模型范围包括人造河、洋河和戴河3条入海河流。然后采用实测潮流和化学需氧量(COD)浓度对数学模型进行了验证。最后通过对河流不同的源强削减方案进行模拟和比较分析。研究结果表明:2013年8月戴河口、洋河口和人造河口海域的COD环境容量分别为375.076 t、346.803 t和309.833 t,其中洋河源强削减最大,人造河次之,戴河最小;各河口单独削减相同比例的COD源强在近岸海域产生的超标面积不等,水体交换能力较弱的戴河削减效果较洋河和人造河更显著;随着源强削减比例增加,超标面积减小,但减幅变低。
The mathematical model of hydrodynamic and pollutant transport in Beidaihe watershed was established by using Mike 21 software. The model range includes 3 rivers of artificial river, Yanghe river and Daihe river. The mathematical model was then validated using measured tide currents and chemical oxygen demand (COD) concentrations. Finally, different schemes of source intensity reduction are simulated and comparatively analyzed. The results show that the COD environmental capacity of Daihekou, Yanghekou and Man-made estuaries was 375.076 t, 346.803 t and 309.833 t respectively in August 2013, of which the Yanghe strong source reduced most, the man-made river was the second, and the Daihe River was the smallest. The reduction of COD intensity by the same proportion alone in the offshore area produced more than standard areas, and the weakened water exchange capacity of Daihe River was more significant than that of Yanghe River and Man-made River. As the proportion of source intensity reduction decreased, But the decrease is lower.