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本文从理论和数值计算上，配合现场实测资料研究海河口拖淤泥沙运动规律及其扩散过程，指导了海河口清淤实际工作．利用数学模型的方法，首次对海河口机械清淤方式之一———机械拖淤所起动泥沙运动规律进行了模拟研究，从理论上给出了拖淤泥沙运动的全部过程，再现了拖淤泥沙随泄流及落潮水流运动的微观细节，确定了拖淤泥沙的输移距离、输出率、落淤范围及回淤量．给出了一定拖淤强度下，机械拖淤对于减缓海河口泥沙严重淤积的短期及一年工程效果．
In this paper, the theory and numerical calculation, with the field data to study the movement of the law and its silt sediment movement of the Haihe River estuary, guiding the actual work of the dredging of the estuary. Using the method of mathematical model, the law of sediment movement initiated by mechanical dragging is studied for the first time in Haihekou mechanical dredging method. The whole process of sediment and sediment movement is given in theory and the drag With the microscopic details of silt sediment discharge and ebb flow, the transport distance, output rate, siltation range and back silting of silt silt were determined. The short-term and one-year project results of mechanical dragging sedimentation for slow sediment deposition in Haihe Estuary are given under a certain tipping-detention intensity.