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。
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.
出处
《海洋工程》
CSCD
北大核心
2004年第2期31-38,共8页
The Ocean Engineering
基金
科技部资助项目(G1999043806
2002AA639250)
国家基金资助项目(40376002)
关键词
ADCP潜标观测
南海
西边界流
潮流
垂向模态
ADCP observation
South China Sea
western boundary current
tidal current
vertical mode
