关键词: 闸孔宽度, 水动力水质模型, 河宽比, 水体置换, 上海市青浦区

Abstract: The difference between the sluice size and the channel width will hinder the flow of water to a certain extent, and result in the prolongation of the replacement period of water, which can easily induce water eutrophication. Therefore, it is of great significance to determine the effect of sluice construction scale on the hydrodynamic and water environment of river channels. Taking the sluice dam in Yuejin polder area of Qingpu District, Shanghai as the research object, a one-dimensional hydrodynamic water quality model was used to simulate and predict the hydrodynamic variation characteristics of the maximum flow and the total inflow water volume of each section and the concentration of COD, NH3-N and TP under different sluice width conditions. The matching relationship between the sluice width and the river section was discussed, and the influence of the sluice width on water quantity and water quality was analyzed. The simulation results showed that the increase of sluice width will directly cause the linear increase of the maximum flow rate, and the total inflow water volume and the improvement of water quality will be restricted to a greater extent by the ratio of the sluice width to the channel width. Under the current drainage and sluice pump regulation, the critical ratio of the sluice width to the channel width in the leaping area is about 2/5.

Key words: sluice width, hydrodynamic and water environment model, ratio of the sluice width to the channel width, water displacement, Qingpu District of Shanghai City