张家山岛码头建设对近岸海域水动力环境影响的数值研究

海洋工程建设会对周边海域的水动力产生不同程度的改变。应用MIKE21建立张家山岛近岸海域平面二维潮流计算模型,对码头工程建设前后近岸海域潮流场进行数值模拟,分析了该工程建设对海洋动力环境的影响,并对波浪和潮流可能引起的泥沙运动及海底冲淤变化情况进行了讨论。结果表明,NNE向浪是码头护岸设计波要素的控制波浪,其他方向的波浪对码头护岸设计要素贡献相对较小;建设前后,工程前沿潮流走向变化不大,与岛边界走向一致,在岸线凹陷区域,在涨急、落急水流较大时段出现了明显变化;对泥沙运动和海底冲淤变化分析可知,波浪产生的沿岸流不会引起港口淤积,可不考虑,潮流可能引起港内淤积,淤积量较小。

Marine construction will affect the hydrodynamics in the adjacent waters. A two dimension tidal current numerical model was constructed by using the MIKE21, numerical simulation of tidal current field in local ocean before and after wharf construction, the paper analyzes the impact of the wharf repair on ocean dynamic environ- ment, and discusses the sand movement, seabed erosion and siltation which are caused by waves and currents. The results showed that NNE wave is the control wave of the wharf design, the other directional waves have rela- tively small contribution to the wharf design. Before and after repair, there is little change in the direction of the coastal current, which is in line with the island bound. But in the shoreline sunken area, there is a significant change in the time of flood and ebb tides of current. According to the analysis of the change of sand movement, seabed erosion and siltation, port siltation is not caused by the coastal current which is generated by waves, that is not to be considered. The tide may cause the port siltation, but the siltation volume is small.