摘要
根据2012年6月在海州湾湾顶浅海区利用ADCP定点测流以及CTD等观测资料,采用经验模态分解(EMD)和Hilbert变换方法,对该海区海流的垂向流速分量及其影响因素进行了分析,研究了垂向流速分量的频率结构及其随时间的变化。结果表明,海州湾湾顶浅海区垂向流速分量变化不规则,以团块状分布为主。经验模态分解显示垂向流速分量存在不同的模态,各模态对整个波动的贡献差异明显,其中心频率构成具有垂向变频特征。垂向流速分量与水平流速分量在低频模态和趋势项具有较好的相关性,表明垂向流速分量与水平流速分量具有一定的联系。
Based on the data obtained from a bottom mounted ADCP and CTD deployed in the shallow water on the top of the Haizhou Bay in June 2012, the upward current and its influencing factors were analyzed by the method of empirical mode decomposition （EMD） and Hilbert transform, and the frequency structure and its temporal variation were also studied. Results showed that the upward current in the shallow water on the top of the Haizhou Bay changed irregularly. Most of them were distributed massly. Empirical mode decomposition showed that the upward current had different vertical modes. Each mode contributed differently to the whole fluctuation,while the center frequency varied vertically. There was a good correlation on the low frequency modes and trends between the vertical component and the horizontal component of velocity,which indicated that they had certain connections.
出处
《海洋通报》
CAS
CSCD
北大核心
2014年第1期62-67,共6页
Marine Science Bulletin
关键词
垂向流速分量
浅海
海州湾
ADCP
ADCP
upward velocity component
shallow water
Haizhou Bay
