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建立一个σ坐标系下三维非线性斜压陆架模式，研究夏季径流量、台湾暖流、黄海冷水团、风场对长江冲淡水扩展的影响。数值试验基本再现了夏季长江冲淡水低盐水舌伸向东北的现象和渤、黄、东海的环流结构。长江径流量只影响近口门附近冲淡木朝东南方向扩展势力和整个冲淡水扩展范围的大小。台湾暖流深受底形的影响，流动路径稳定，且不受自身强度的影响，又主流远离长江口，对长江冲淡水扩展的影响不大。黄海冷水团产生的余流在长江口海区阻碍着冲淡水沿岸向南扩展，在远离长江口海区诱导冲淡水向东南运动。总的黄海冷水团的作用是使长江冲淡水低盐水舌伸向东北．黄海冷水团越强，这种作用就越明显。夏季风场在冲淡水转向东北的过程中作用显著。
A three-dimensional non-linear baroclinic model in the σ-coordinate system was established to study the effect of summer runoff, Taiwan’s warm current, the Yellow Sea cold water mass, and the wind field on the Yangtze River’s red water expansion. Numerical experiments basically reflect the phenomena that the saltwater extends to the northeast in the Yangtze River and the circulation structures in Bohai Sea, Yellow Sea and East China Sea. The runoff from the Yangtze River only affects the expansion of the diluted wood in the southeast near the gate and the extension of the whole range of diluted water. The warm current of Taiwan is deeply influenced by the bottom shape, the flow path is stable, and it is not affected by its own strength. It is also far away from the mouth of the Yangtze River and has little effect on the expansion of the Yangtze River’s fresh water. Remaining flows from the Yellow Sea cold water mass impede the southward expansion of diluate along the Yangtze River estuary and induce the movement of red water to the southeast away from the Yangtze Estuary. The role of the total Yellow Sea cold water is to make the Yangtze River dilute salt water to the northeast. The stronger the Yellow Sea cold water mass, the more obvious this effect is. The summer monsoon plays a significant role in red water diverting to the northeast.