崖州湾海域三维海洋水动力特性的数值模拟研究

Numerical Simulation of Three-dimensional Ocean Hydrodynamic Characteristics in Yazhou Bay

掌握崖州湾海域的水动力变化规律,对该区域海岸带工程建设和社会经济的可持续发展具有重要的实际意义。本文基于非结构网格有限体积海洋模型(finite-volume coastal ocean model,FVCOM),建立崖州湾海域高分辨率三维水动力数值模型,研究该海域潮位、潮流和余流的分布特性和变化规律。结果表明:在崖州湾海域,潮汐潮流类型整体为不规则全日潮,近岸潮流呈现明显的往复运动;崖州湾两侧流速明显大于湾内,在大潮期内涨潮时间约为落潮时间的1倍,最大流速约2.2 m/s,最大潮差约1.5 m;崖州湾海域整体余流偏向西北方向,在西侧海域受到岸线地形突出的影响,余流较大,湾内弧形东侧区域存在滞流点,容易造成淤积。

It is of great practical significance for the construction of coastal zone and the sustainable development of social economy to thoroughly grasp the hydrodynamic variation law of Yazhou Bay.Based on Finite Volume Coastal Ocean Model(finite-volume coastal ocean model,FVCOM),a high-resolution three-dimensional hydrodynamic numerical model of YZB is established to study the distribution characteristics and variation rules of tidal level,tidal current and residual current in this area the unstructured grid.The results show that the tidal current type in the sea area of YZB is generally irregular all-day tide,and the near-shore tidal current shows obvious reciprocating movement.The flow velocity on both sides of YZB is obviously greater than that in the middle.During spring tide,the high tide time is about twice that of low tide time,the maximum flow velocity is about 2.2 m/s,and the maximum tidal range is about 1.5 m.The overall residual current in the sea area of YZB is biased to the northwest direction,and the circulation phenomenon appears in the west area causing siltation,which is affected by the prominent shorelines.There are stagnation points on the eastern side of the arc in the bay,which is easy to cause siltation.