【摘要】 将永暑礁水域1992年逐时潮位和1993年5月—2002年5月各航次的海流及2002年海面逐时风等观测资料进行统计和分析,讨论该岛礁水域潮汐和海流变化特征并对综合极值海流进行初步估算。结果表明,该岛礁水域全日分潮大于半日分潮,潮汐性质属不正规日潮,最大可能潮差较大。春季该岛礁水域实测海流变化较大;最大流速75cm/s。潮流性质为不正规日潮流,随水深的增加日潮流的性质有所减弱;主要日分潮流多作顺时针方向旋转,主要半日潮流则作反时针方向旋转。春季余流较稳定,速度在10cm/s左右,流向多为偏S-SW向。初步探讨了表层不同方位上综合极值海流的分布,不同方位上综合极值海流相差较大,NE、SSW方位上综合极值海流占份量较显著,显示出季风海流的特征。更多还原

【Abstract】 Based on the observed current, tide and wind data at Yongshu Reef by multidisciplinary oceangraphic expediton to the Nansha Islands in May 2002 and over the past decade, the characteristics of tide and current at Yongshu Reef have been discussed and the synthesis extremum current has been estimated. The results show that the tide at Yongshu Reef is of irregular diurnal tide, the main diurnal constituents are larger than the main semi-diurnal constituents and the maximum tidal range is theoretically large relatively. The variation range of the observed velocity is large. The observed maximum velocity is 75 cm/s. The mixed tidal current is dominant among the tidal current features. With the increase of water depth, the diurnal tidal current features decrease. At Yongshu Reef, t he major axis of K1 diurnal c onstituent current ellipse is more obvious and located along the directions of NW and SE. The major diurnal constituent currents rotate clockwisely, but the major semi-diurnal constituent currents rotate counterclockwisely. The residual current discharge is not large but both speed and direction are relatively stable in spring. The synthesis extremum currents in different orientatons are different, and the monsoon currents are prevailing in the orientatons NE and SSW.更多还原