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本文结合大窑湾港区建设的实际工程，计算了大窑湾潮流场及悬浮物浓度的沉降扩散。采用垂向平均的二维潮流场模型，其开边界条件考虑了海湾内潮波反射的影响，潮流场的计算结果与实测值比较符合。对具有沉降项的悬浮物浓度对流扩散方程也采用垂向平均处理，给出了其合理的表达，结合潮流场的实测及计算数据，确定了沉降项中的参数。计算的浓度分布结果为工程环境评价提供了有益的依据。
In this paper, combined with the actual construction of Dayaowan port construction, the sedimentation and dispersion of tidal current and suspended matter concentration in Dayao Bay are calculated. The vertically averaged two-dimensional tidal flow field model is used. The open boundary conditions take into account the influence of tidal wave reflection in the bay. The calculated results of the tidal flow field are in good agreement with the measured values. The convection - diffusion equation with suspended sediment concentration is also treated by vertical averaging. The reasonable expression of the convection - diffusion equation is given. The parameters in the subsidence are determined according to the measured and calculated data. The calculated concentration distribution provides a useful basis for engineering environmental assessment.