北部湾北部潮流谱分析和余流特征研究

【目的】研究北部湾北部的潮流谱和余流特征。【方法】利用1988年10月至1989年8月的涠洲岛附近10m、20m和30m海流观测资料进行谱分析。【结果】无论频率f0或f0,全日潮谱峰都高于半日潮谱峰。其中,主要半日潮周期为12h、12.4h,主要日潮周期分别为23.9h和25.8h。在半日潮和全日潮分量中,顺时针分量是主要的。从余流前进矢量可以看出:冬半年,10m、20m和30m层平均余流矢量方向分别为302°、338°和43°。夏季,10m、20m和30m层平均余流矢量方向分别为246°、298°和292°。【结论】风对1988年10月至1989年2月余流影响明显,但是制约余流运动的主要因素是北部湾北部环流。

Analysis of Tidal Current Spectrum and Study of Residual Current in Northern Beibu Gulf

[Objective] To reveal the characteristics of tidal current spectrum and residual current in the northern Beibu Gulf.[Method] The tidal current data at 10m, 20m and 30m layer, respectively, observed near the Weizhou Island from October 1988 to August 1989, were analyzed using the spectrum method.[Result] The peaks of diurnal tidal spectrums were higher than that of semi-diurnal no matter f>0 or f<0.The periods of two major semi-diurnal tides were 12 h and 12.4 h, respectively, whereas the periods of two main diurnal tides were 23.9 h and 25.8 h, respectively. Among the semi-diurnal and diurnal component tides, the clockwise components were dominant. The averaged residual current direction was 302°, 338° and 43° in winter at 10m, 20m and 30m layer, respectively, whereas it was transformed to be 246°, 298° and 292° in summer.[Conclusion] Although the monsoon wind had important effect on the residual current in the Beibu Gulf from October to February, the residual currents in the northern Beibu Gulf was dominated by the general circulation structure in the Beibu Gulf.