Characteristics of turbulent kinetic energy dissipation rate and turbidity near the coast of East China Sea

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• 作者：Yanwei Zhang 张艳伟 ; Huiping Xu 许惠平…
• 刊名：Chinese Journal of Oceanology and Limnology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：34
• 期：5
• 页码：1134-1142
• 全文大小：2,209 KB
• 刊物主题：Oceanography;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5005
• 卷排序：34

文摘

The East China Sea (ECS) has a high suspended-sediment concentration because of the influence of the Changjiang River, indicated by high turbidity in the water. Considering the islands offthe coast and the complex topography, and the strong influence of tides and wind, the coast offthe ECS is a typical region with strong oceanic mixing processes. The changes in the dynamic processes near the bottom play an important role in the control of water turbidity. The turbulent kinetic energy dissipation rate ( ε ) is a parameter that shows the strength of ocean mixing. This is estimated based on a structure method using current velocity that is measured by a high-frequency Acoustic Doppler Current Profiler (ADCP) from a seafloor observatory in the ECS. The results indicate strong ocean mixing processes with a mean ε value of 5.7×10-5 W/kg and distinct tidal variations in the dissipation rate. Conversely, the variation of the water turbidity leads to changes in the water dynamical structure near the bottom. Comparing the dissipation rate with the turbidity near the bottom boundary layer, we find that the high turbidity mimics strong ocean mixing.Keywordturbulent kinetic energy dissipation rateturbiditytidesnear bottom boundaryEast China Sea