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本文通过河工模型试验，对上海合流污水二期工程污水稀释扩散规律进行了研究。研究分两个阶段进行，即扩散器长２００ｍ、设６根上升管和扩散器长２０７ｍ、设１０根上升管。确定了不同径流量和潮型条件下混合区范围的大小及其变化规律，分别对洪季大潮、洪季小潮、枯季大潮、枯季小潮进行了研究。从试验结果看，扩散器长度和上升管根数对混合区范围的大小有重要影响，而且在白龙港水域排放１７０万ｍ３／ｄ的污水还是可行的。
In this paper, through the river model test, the law of dilution and diffusion of sewage in the second phase project of Shanghai Condensate Sewage Project was studied. The research was carried out in two stages, namely, the diffuser length was 200m, six risers and diffusers were set as 207m and 10 risers. The size of the mixed zone and its variation under different runoff and tidal conditions were determined. The tidal range of flood season, small tide in the flood season, large tide in the dry season and small tide in the dry season were studied respectively. From the experimental results, the length of the diffuser and the number of rising pipes have an important influence on the size of the mixing zone. It is still feasible to discharge 1.7 million m3 / d of sewage in the waters of Bailonggang.