海南新海夏季潮流谱分析和余流研究

The spectrum analysis of tidal current and the study of residual current in summer in Xinhai Bay of Hainan Province

根据夏季琼州海峡新海附近15m处地层潮流谱分析结果可得,无论是f>0或f<0,全日潮谱峰都高于半日潮谱峰。其中,半日潮周期,约为12h,12.4h,日潮存在两个,一个在23.9h,另一个在25.8h前后;在半日潮和全日潮分量中,反时针分量是主要的、顺时针的日潮能谱只有反时针的84%;顺时针的半日潮能谱只有反时针的63%;浅水分潮8.3h,6.2h和超过24h的4.2d,3d等也很明显,但是未通过显著性检验;大多数余流流速在5～10cm/s之间,个别情况超过40cm/s。受反时针运动涡旋影响,余流主要向偏东北、北、西北方向运动。在这个区间内的流向,占总观测数68%以上;风对余流也有重要影响:东北风将使余流方向偏向西北,偏北向风将使余流方向偏南。

Based on the result of tidal current in the Xinhai area of Qiongzhou Strait,no matter f0 or f0,diurnal tidal spectrum peak is higher than the semidiurnal tidal spectrum peak.Among them,the cycles of semidiurnal tide are about 12.0 h and 12.4 h,and the cycles of diurnal tide are about 23.9 h and 25.8 h.In the component of diurnal and semidiurnal tide,the anti-clockwise component is the main component： clockwise diurnal spectrum is only 84% of anti-clockwise diurnal tidal energy spectrum;clockwise semidiurnal tidal energy spectrum is only 63% of anti-clockwise semidiurnal tidal energy spectrum.The main cycles of shallow-water tide are 8.3 h and 6.2 h,and others longer than one day,such as 4.2 d and 3 d,are also obvious,but they all don＇t content significant test.The velocity of most residual currents ranges from 5 cm/s to 10 cm/s,some particulars are over 40 cm/s.Influenced by the anti-clockwise circulation movement,the main directions are in the range of NE,N and NW,which make up more than 68% of the total observations.Wind also has significant effect： northeast wind will make direction of residual current to south,the north wind will make the direction of residual current to south.