摘要
沉积物和营养盐的扩散与沉积过程受垂向流的影响,根据2015年10月13～22日"世越号"沉船打捞前及2017年5月10～16日沉船打捞后利用ADCP在沉船海域的定点流速观测资料,采用经验模态分解和功率谱分析的方法,研究了该海域海流垂向分量的变化规律及其与潮流的关系。研究结果表明,沉船海域垂向流速分量受涨落潮运动影响,垂向流速分量与东方向、北方向流速分量具有一定的相关性,对海流垂向分量影响较大的分潮主要为半日分潮和浅水分潮,上层水的涨、落潮流对垂向流影响程度高于下层水流;沉船打捞前垂向流与水平流的相关程度高于沉船打捞后,垂向流速分量的分布及变化规律明显受沉船的影响,打捞前垂向流的现象显得更加强烈。
The diffusion and deposition processes of sediments and nutrients are affected by the vertical current component. Based on the data obtained from an ADCP deployed in the Sewol wreck area from 13th to 22nd in October 2015 before the wreck salvage and that from 10th to 16th in May 2017 after the wreck salvage, the variation of the vertical current component and its relationship with tidal currents were analyzed by the methods of empirical mode decomposition and power spectrum analysis. The results show that the vertical current component in the wreck sea area is affected by the ebb and flow. A certain correlation is found between the vertical component and the horizontal components. The main tidal constituents affecting the vertical current component are semidiurnal constituent and shallow water constituents. Besides, the effect of the tidal current to the vertical current is larger in the upper water than that in the lower water. The distribution and variation of vertical current components are obviously affected by the wreck due to the correlation between vertical flow and horizontal flow that before the salvage is larger and the phenomenon of vertical flow is more intense before the salvage.
作者
张田雷
ZHANG Tian-lei(Key Laboratory of Surveying and Mapping Technology on Island and Reef, NASG, Qingdao 266590, China;Tianjin Survey and Design Institute for Water Transport Engineering, Tianjin 300456, China)
出处
《水道港口》
2019年第2期213-217,共5页
Journal of Waterway and Harbor
基金
海岛(礁)测绘技术国家测绘地理信息局重点实验室资助项目(2015B02)
关键词
垂向流速分量
经验模态分解
本征模函数
HILBERT变换
功率谱分析
vertical current component
empirical mode decomposition
intrinsic mode function
Hilbert transform
power spectrum analysis
