舟山复杂海域条件下新建码头工程水动力及泥沙冲淤变化研究

Hydrodynamics and sediment erosion and silt change of new wharf project in complex sea area of Zhoushan

基于水动力条件在海岸带地区海工建设研究中的重要性,考虑到舟山群岛水道纵横、岛屿密集的特点,其水动力环境尤为复杂。为掌握区域工程建设对该海域的影响,结合实测资料对舟山群岛定海海域潮流场演化过程展开二维数值模拟研究。在此基础上,进一步对定海盘峙岛某码头区域进行涨潮、落潮时潮流场与冲淤分布的详细分析。结果表明,整体上看,工程后周边海域潮流流态没有较大改变,仅在码头周边1500 m范围之内主要受码头和附近船厂方向的反向潮流影响,流向发生反方向流动;码头的阻流作用对工程较小范围内的流速变化较为明显,码头南北两侧和西蟹村岛北侧的流速分别呈现出减小和增大的趋势;受局部工程影响,整体冲淤变化区域主要集中在码头周边海域,其中淤积的海域主要集中在码头附近、造船厂东西两侧区域,冲刷的海域主要集中在盘峙岛和西蟹村岛拐角处的挑流区域。

Based on the importance of hydrodynamic conditions in the study of marine engineering construction in coastal zone,the hydrodynamic environment of Zhoushan Islands is particularly complex due to its vertical and horizontal waterways and dense islands.In order to grasp the influence of regional engineering construction on the sea area,we carry out a two-dimensional numerical simulation study on the evolution process of tidal current field in Dinghai sea area of Zhoushan Archipelago based on the measured data.On this basis,we analyze the tidal current field during high tide and low tide and the distribution of scouring and silting in detail in a wharf area of Panzhi Island in Dinghai.The results show that on the whole,the tidal current pattern of the surrounding sea area is not changed greatly after the project.Only within 1500 m around the wharf,it is mainly affected by the reverse tidal current of the wharf and the nearby shipyard,and the flow direction is reversed.The flow velocity in a small area of the project is changed by the flow resistance of the wharf.The flow velocity on the north and south sides of the wharf and the north side of Xixie Village Island shows a trend of decrease and increase respectively.Affected by local projects,the overall change area of scouring and silting is mainly concentrated in the sea area around the wharf.Among them,the silted sea area is mainly concentrated near the wharf and on the east and west sides of the shipyard.The scour area is mainly concentrated in the catchment area at the corner of Panzhi Island and Xixie Village Island.