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运用ECOMSED建立了长江口的水动力模型。潮位和流速的验证结果表明模型能够较好地反应长江口的水动力特性,可以应用于长江口的实际计算。对2010年7月长江发生的大洪水对长江口的水动力特性的影响进行了模拟。模型计算结果表明,由于三峡工程的蓄水作用,使得长江口附近的流速发生明显的减小,对污水的稀释扩散和水环境也会产生一定的影响。上海三个排污口分别排出稀释度为1000的污水时,由于三峡工程的蓄水,上游来水量相应减少,不利于上海排出污水的稀释扩散。
Using ECOMSED to establish the Yangtze River Estuary hydrodynamic model. The result of tide level and velocity shows that the model can well reflect the hydrodynamic characteristics of the Yangtze Estuary and can be applied to the actual calculation of the Yangtze Estuary. The impact of the flood in the Yangtze River in July 2010 on the hydrodynamic characteristics of the Yangtze Estuary was simulated. The model calculation results show that due to the impoundment of the Three Gorges Project, the flow velocity near the mouth of the Yangtze River has obviously decreased, which will also exert some influence on the dilution and diffusion of wastewater and the water environment. When the three sewage outlets in Shanghai discharge effluents with a dilution of 1000 respectively, due to the impoundment of the Three Gorges Project, the amount of incoming water in the upstream decreases correspondingly, which is not conducive to the dilution and diffusion of the discharged sewage in Shanghai.