洋浦港附近夏季潮余流特征分析

通过设置在洋浦外面12m等深线处锚定浮标,在2006年7月进行1个月的表、中、底层海流连续观测,通过资料分析得出如下结论:受北部潮流无流点影响,涨落潮方向基本指向北-东北方向,实测流速最大也只有37cm/s;表、中、底层的余流流向基本一致,在18～22°之间变化;表层余流流速在3～17cm/s范围内变化,变化幅度较大,中层次之,底层最小;余流流速有2个近似半个月的变化周期,流速起伏与潮位高低有很好对应关系;潮汐余流是这个海域余流形成的主要机制,风对余流流速流向也有一定影响.

ANALYSIS OF TIDE-INDUCED RESIDUAL CURRENT CHARACTERS NEAR THE YANGPU PORT IN SUMMER

According to the data of currents at the surface,middle,and bottom layers observed by the moored buoy at beach of 12-meters isobath outside Yangpu Port in July 2006,some characterestics are abtained as follows.The directions of flood and ebb tide are north-northeast influenced by the non-current point.The maxmum velocity of the current observed is no more than 37cm/s.The directions of residual current at surface,middle and bottom layers are almost the same,changing from 18 to 22 degree.The speeds of residual current in surface layer change between 3 and 17cm/s,while that in mid-layer takes second place,and the bottom layer ranks the least.The speeds of the residual current have two periods,both are nearly half month.What is more,the fluctuation of speed well corresponds with the heights of tidal levels.Tide-induced residual current is the main mechanism of the residual current in this area,and both velocity and direction are also affected by the wind.