【摘要】 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．更多还原

【Abstract】 The effects of depth,width,variation of mouth bar topography and suspended sediment concentration on circulation structure,distributions of salinity and suspended sediment in the area of turbidity maximum in a partially mixed estuary are studied by using atwo-dimensional vertical numerical model.It indicates that the mouth bar obstructs thesaltwater intrusion,makes the position of null point and the center of concentration of turbidity maximum further seaward and reduces the concentration of turbidity maximum.Variations of estuary width and slope would change the circulation structure and distributions of salinity and suspended sediment.With respect to the effect of suspended sedimentconcentration on water density,the null point would be closer to the upstream boundary,the center of concentration of turbidity maximum would be closer to the downstream andthe suspended sediment concentration would reduce slightly.更多还原