Author(s): ZHANG Zhuo, SONG Zhi-Yao, Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems, School of Mathematical Sciences, Nanjing Normal University
Pages: 995-1000
Year: 2015 Issue:  5
Journal: Oceanologia et Limnologia Sinica
Keyword:  tide; turbulent shear stress; velocity profile; tidal acceleration;
Abstract: Turbulent shear stress is an important dynamic force of flow in a tidal channel, whose distribution affects directly the velocity profile. In this paper, we derived a new theoretical expression of vertical distribution in tidal turbulence shear stress, with which stress development over tidal cycles can be profiled. We applied this model successfully for the turbulent shear stress obtained from a 25-hour velocity profile from field measurement over tidal circles near the Yangkou Harbor off Jiangsu coast, East China Sea in September 2013. Comparison between simulated and the measurement data shows good agreement in vertical distribution. The model can well depict concave during tide acceleration and convex during deceleration. By analyzing the amplitude and phase variation in water column at different depths, we found that the non-dimensional parameter(Ri) reflecting mutual relationship among tidal period, turbulence intensity, and water depth, determines the curvature of turbulence shear stress distribution in a tidal period. For off-coast tides, however, local water depth is the main factor affecting the deviation from linearity of the turbulent shear stress.