Modeling investigation of asymmetric tidal mixing and residual circulation in a partially stratified estuary

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• 作者：Wei-Bo Chen ; Wen-Cheng Liu
• 关键词：Hydrodynamic model ; Salinity distribution ; Tidal asymmetric mixing ; Residual circulation ; Stratification ; Danshuei River estuary
• 刊名：Environmental Fluid Mechanics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：16
• 期：1
• 页码：167-191
• 全文大小：4,254 KB
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• 作者单位：Wei-Bo Chen (1)
  Wen-Cheng Liu (2) (3)
  
  1. National Science and Technology Center for Disaster Reduction, New Taipei City, 23143, Taiwan
  2. Department of Civil and Disaster Prevention Engineering, National United University, Miaoli, 36003, Taiwan
  3. Taiwan Typhoon and Flood Research Institute, National Applied Research Laboratories, Taipei, 10093, Taiwan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environmental Physics
  Mechanics
  Hydrogeology
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Netherlands
• ISSN：1573-1510

文摘

A three-dimensional hydrodynamic model was applied to the Danshuei River estuarine system in northern Taiwan to investigate the influence of flood-ebb, spring-neap tidal cycles, and salinity distribution on tidal mixing, residual circulation, stratification, and tidal asymmetry. The model was validated using observational data collected in 2008. The results from the model agreed well with observations of water surface elevation, tidal currents, and salinity. It was found that the depth-averaged tidal current during flood tide is weaker with a shorter duration than that during ebb tide in the estuary, which was attributed to tidal asymmetry. Vertical profiles of salinity, flow, eddy diffusivity, and Richardson number also showed a marked asymmetry between flood and ebb tides. Bottom boundary stresses were higher during flood tides than during ebb tides, resulting in more mixing occurrence and consequently decreasing the Richardson numbers. The tidally averaged salinity was more stratified during neap tides than during spring tides because the presence of the stronger vertical diffusivity and turbulent kinetic energy during spring tides. The modeling results also confirmed that the residual circulation was stronger during neap tides than during spring tides. Keywords Hydrodynamic model Salinity distribution Tidal asymmetric mixing Residual circulation Stratification Danshuei River estuary