洋山海域工程前后水动力特征分析

发布时间：2018-05-04 09:01

本文选题：洋山港 + 水动力　；参考：《长江流域资源与环境》2017年01期

【摘要】：洋山海域自2002年建港工程以来,先后封堵了北岛链三个过水汊道,使得海域附近水动力结构发生显著变化。采用工程前后大量水动力实测资料,并结合数值计算结果,对洋山海域工程前后的水动力特征进行了综合分析。研究结果表明:工程后大部分海域涨潮流速降低,但小洋山前沿除外;整个海域落潮流速度增加,但地形急剧缩窄的东口门区域增幅并不显著。讨论认为,地转偏向力显著增强了海域北部区域特别是小洋山前沿海域的涨潮流速,是小洋山岛屿前沿海域涨潮流速工程后维持不变的重要原因;受南岛链不规则岸线的影响,地转偏向力对落潮流影响不显著。工程后各汊道的封堵使得落潮流外泄不畅而发生壅水,使得工程后涨潮时段海域水位低于工程前,没有壅水现象发生。工程后的涨、落憩流时段均形成了较大范围、较长时段的弱流场。
[Abstract]:Since the construction of the harbor project in 2002, the Yangshan sea area has blocked three water branches of the North Island chain, which makes the hydrodynamic structure around the sea area change significantly. Based on a large number of hydrodynamic measured data before and after the project and combined with the results of numerical calculation, the hydrodynamic characteristics of Yangshan sea area before and after the project are comprehensively analyzed. The results show that the tidal current velocity decreases in most of the sea areas after the project, except in the front of Xiaoyangshan, and the velocity of falling tidal current increases, but the increase in the area of Dongkoumen, where the topography shrinks sharply, is not significant. It is considered that the geostrophic deflection significantly increases the tidal current velocity in the northern part of the sea area, especially in the sea front of Xiaoyangshan, which is an important reason for maintaining the same tide velocity after the engineering of the tidal current in the coastal area of Xiaoyangshan Island, and is affected by the irregular shoreline of the South Island chain. The effect of geostrophic deflection force on the falling tide is not significant. The blockage of each inlet after the project makes the discharge of the falling tidal current difficult and the backwater occurs, which makes the water level of the sea area lower than that of the project during the period of high tide after the project, and there is no backwater phenomenon. The rising and falling periods of open flow after the project have formed a large range of weak flow field in a long period of time.
【作者单位】：三峡大学水利与环境学院;上海市地质调查研究院;长江三峡通航管理局;
【基金】：国家自然科学基金项目(41506103) 三峡大学博士人才启动基金(KJ2014B032)~~
【分类号】：P75;P731.2

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