连云港口门防波堤建设对航道回淤影响数值研究

以连云港海区为例,建立潮流、波浪共同作用下的泥沙运动数学模型,应用年平均含沙量场作为依据对临界冲刷切应力和冲刷率进行率定,并利用实测资料对模型进行验证。在模型基础上研究了口门防波堤建设对年平均含沙量场及进港航道回淤的影响,分析了工程后平均含沙量场的分布形式和航道回淤强度的沿程变化规律。结果表明防波堤修建后,口门处含沙量较高,并向港内和外海逐渐降低,航道回淤强度分布形态与航槽内含沙量分布形态相似;航槽第二年回淤率低于第一年。

Numerical modeling of silting features in approach channel under the influence of entrance breakwaters in Lianyungang Harbour

By considering the effects of both tides and waves,a 2-D numerical model was used to simulate sediment transport in Lianyungang Harbor.The yearly-averaged SSC field was used to calibrate the critical erosion shear stress and erosion rate.Many other measured data were used to validate the model.Based on the model,the SSC field and the silting feature of the approach channel under the influence of entrance breakwater were investigated.The results showed that SSC outside the entrance is relatively high and decreases to the inner harbor and the out sea,and the silting intensity distribution is strongly related to the SSC value in the approach channel.The results also showed that the silting intensity rate decreases with time,which means the silting rate in the first year is greater than that in the second year.