Study on hydrography and small-scale process over Zhoushan sea area

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• 作者：He Wu ; Min Du ; Xiaoyong Wang ; Jie Meng
• 关键词：tidal characteristics ; parameterization method ; turbulent kinetic energy dissipation rate
• 刊名：Journal of Ocean University of China
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：14
• 期：5
• 页码：829-834
• 全文大小：725 KB
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• 作者单位：He Wu (1)
  Min Du (1)
  Xiaoyong Wang (1)
  Jie Meng (1)
  
  1. National Ocean Technology Center, Tianjin, 300112, P. R. China
  
• 刊物主题：Oceanography; Meteorology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5021

文摘

This paper mainly analyzes the tidal characteristics and small-scale mixing process near Zhoushan Islands. First, the spectral analysis and wavelet analysis are adopted for the measured tide level data and tidal current data from the Zhoushan sea area, which indicate that the main tidal cycle near Hulu Island and Taohua Island is semi-diurnal cycle, the diurnal cycle is subordinate. Both their intensities are changed periodically, meanwhile, the diurnal tide becomes stronger when semi-diurnal tide becomes weak. The intensity of baroclinic tidal current weakens at first and then strengthens from top to bottom. Then, in this paper, the Gregg-Henyey (G-H) parameterization method is adopted to calculate the turbulent kinetic energy dissipation rate based on the measured temperature and tidal current data. The results of which shown that the turbulent kinetic energy dissipation rate around Hulu Island is higher than that around Taohua Island. In most cases, the turbulent kinetic energy dissipation rate during spring tide is larger than that during the neap tide; the turbulent kinetic energy dissipation rate in the surface layer and the bottom layer are higher than that in the intermediate water; the changes of turbulent kinetic energy dissipation rate and tidal current are basically synchronous. The modeled turbulent kinetic energy dissipation rate gets smaller with the increase of the stratification, however, gets larger with the increase of shearing.