六垛南闸下游引河泥沙淤积特性数值分析

Numerical Analysis of Sediment Deposition Characteristics in LowerReaches of Southern Liuduo Gate

为了明确六垛南闸下游引河的淤积特性,基于Mike软件数值计算求解了该闸下游引河的水沙运动,对闸下引河冲淤进行了预测分析,并通过闸下实测水位和预测水位进行对比验证了计算模型的正确性。结果表明:各泄流量时下游引河的水流均为顺岸流动,流速分布规律相同;相同流量时沿程流速整体呈增大趋势。闸下引河的冲淤特性呈现出潮位越低,冲淤量越大的特点。建议六垛南闸开闸冲淤应尽量选择入海口潮位<0.3m时进行,同时可按照10d一个周期进行开闸冲淤。研究成果可为江苏省同类沿海挡潮闸防淤减淤提供参考。

To clarify the deposition characteristics in the downstream diversion canal of Southern Liuduo Gate,the sediment transport of the downstream diversion canal of Southern Liuduo Gate was solved based on the numerical calculation of Mike software,and the erosion and deposition were predicted and analyzed in this paper.The correctness of the calculation model is verified by comparing the measured water level and the predicted water level.The results show that the flow of the downstream diversion canal is along the bank at each discharge,and the velocity distribution is the same.At the same flow rate,the overall flow rate increases.The erosion and deposition characteristics of the diversion river show that the lower the tidal level is,the greater the amount of erosion and deposition is.It is suggested that the erosion and deposition of Southern Liuduo Gate should be carried out when the tidal level of the estuary is less than 0.3m,and the erosion and deposition can be carried out according to a cycle of 10 days.The research results can provide reference for the prevention and reduction of deposition of similar coastal tidal gates in Jiangsu Province.