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分析了杭州湾北岸一个潮间带小海湾─—炮台湾及其前沿海域的流场、含沙量分布及水下地形的变化，指出小海湾内水流主要受湾外浅水水流控制，在独特的边界地形影响下，湾内在不同时段内出现历时较短的水平环流，流场变化较快，小水深时（＜20cm）水体含沙量较高，含沙至随水深和水流的变化而急剧变化。对湾外浅水水域水流的挟沙力进行了计算，并讨论了炮台湾围堤后水流挟沙力的变化，给出围堤后水下岸坡剖面变动的预测，经与实测比较，结果是令人满意的。
The changes of the flow field, sediment concentration distribution and underwater topography in an intertidal bay - the gunnage and its frontal waters at the northern bank of Hangzhou Bay are analyzed. It is pointed out that the flow in the small bay is mainly controlled by the shallow water flow outside the bay. Under the influence of the boundary topography, the horizontal circulation in the bay lasted for a short time and the flow field changed rapidly. When the water depth was small (<20cm), the sediment concentration was high, and the sediment content changed drastically with the depth and water flow . The sediment carrying capacity of the shallow currents in the outer bay is calculated and the variation of sediment carrying capacity of the bank after the embankment is discussed. The prediction of the variation of the subsea bank slope after the embankment is given. The result is Satisfactory.