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基于三维浅水方程和溶解物质输运方程研究河口水库流动和水体交换。用实测水文资料对数值模型进行验证。利用该模型计算分析了不同风况以及水库引排水条件下水库水体流动特征,结果表明风对水库水闸附近的流场影响较小,但对整个库区流场会有一定影响。针对长江口青草沙水库上游水闸引水、下游水闸关闭或开启的两种运行模式,通过溶解物质浓度模拟并依据所定义的水体交换率,给出了换水率随时间的变化过程。可为制定合理的水库引排水方案,确保水库水质提供科学依据。
Study of estuary reservoir flow and water exchange based on three - dimensional shallow water equation and dissolved matter transport equation. The actual hydrological data is used to verify the numerical model. The model was used to calculate and analyze the flow characteristics of reservoir water under different wind conditions and reservoirs drainage. The results show that the wind has little influence on the flow field near the sluice, but it will have an impact on the flow field of the reservoir. In view of the two modes of water diversion at the upstream of Qingcaosha Reservoir in the Yangtze Estuary and the closure or opening of the downstream sluice, the changing process of water exchange rate with time was given by simulating the concentration of dissolved substances and according to the defined exchange rate of water bodies. It can provide a scientific basis for formulating a reasonable reservoir drainage scheme and ensuring the reservoir water quality.