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南海西边界ADCP观测海流的垂直结构
引用本文:杜岩,王东晓,陈荣裕,毛庆文,齐义泉.南海西边界ADCP观测海流的垂直结构[J].海洋工程,2004,22(2):31-38.
作者姓名:杜岩  王东晓  陈荣裕  毛庆文  齐义泉
作者单位:中国科学院,南海海洋研究所热带海洋环境动力学重点实验室,广东,广州,510301
基金项目:科技部资助项目(G1999043806、2002AA639250),国家基金资助项目(40376002)
摘    要:采用多种数据处理方法,分析了南海西南陆架西边界处定点连续观测站上的海流记录。正压潮流的调和分析结果表明该海域以日周期潮流为主,潮流椭圆随深度旋转。去潮后流速垂直结构的奇异值分解(SVD)证实观测点的流速结构存在不同的垂向模态,第一模态对应平均流的变化部分,第二模态含有倾向性变化部分,双日周期变化在各个模态中均较明显。对各观测层流速进行小波分析,进一步发现观测流的频率构成具有垂向变频和同一层次频率漂移的特征。

关 键 词:ADCP潜标观测  南海  西边界流  潮流  垂向模态
文章编号:1005-9865(2004)02-0031-08
修稿时间:2003年3月21日

Vertical structure of ADCP observed current in the western boundary of the South China Sea
DU Yan,WANG Dong-xiao,CHEN Rong-yu,MAO Qing-wen,QI Yi-Quan.Vertical structure of ADCP observed current in the western boundary of the South China Sea[J].Ocean Engineering,2004,22(2):31-38.
Authors:DU Yan  WANG Dong-xiao  CHEN Rong-yu  MAO Qing-wen  QI Yi-Quan
Abstract:Harmonic analysis, singular value decomposition and wavelet transformation are used to analyze the continuous current records observed on the continental shelf nearby the southwestern South China Sea. The Harmonic analysis of barotropic current shows the diurnal tidal current makes the main tidal current part. The tidal ellipses whirl round along with depth. The current has a distinct vertical structure. The result of de-tide current using singular value decomposition verifies the existence of different vertical modes. The first mode matches the averaged current very well. The second mode matches the trend part. All modes' time serials show two days are a distinct period. Wavelet transformation further reveals the feature of the vertical structure. The main frequency is constituted of observed current change in vertical direction and draft from time to time.
Keywords:ADCP observation  South China Sea  western boundary current  tidal current  vertical mode
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