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本文运用垂向二维数值模型对部分混合型河口的深度、宽度、拦门沙地形变化以及悬沙浓度对最大浑浊带区域的环流结构、盐度和悬沙分布的影响进行了探讨．结果表明：河口拦门沙对盐水上溯有阻碍作用，它使滞流点和最大悬沙浓度中心的位置向海推移，最大悬沙浓度有所降低；河口宽度与坡度的变化会改变环流结构和盐度、悬沙分布；考虑悬沙浓度对水体密度的影响后，滞流点更接近上边界，最大悬沙浓度中心更接近下边界，悬沙浓度有所降低．
In this paper, the vertical two-dimensional numerical model is used to study the influence of the depth and width of some mixed estuaries, the change of barren sand topography and the suspended sediment concentration on the circulation structure, salinity and suspended sediment distribution in the maximum turbidity zone. The results show that the estuarine barren water has a hindrance to the upstream of salt water, which causes the stagnation point and the maximum suspended sediment concentration center to move towards the sea, and the maximum suspended sediment concentration decreases. The change of width and slope of the estuary will change the circulation structure and Salinity and suspended sediment distribution. After considering the effect of suspended sediment concentration on water density, the stagnant point is closer to the upper boundary, the maximum suspended sediment concentration center is closer to the lower boundary, and the suspended sediment concentration is reduced.