Oscillatory velocity in boundary layer over mobile sediment bed under asymmetric wave and current conditions

作     者：Xin Chen Xin Chen

作者机构：Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network SystemChina Agricultural UniversityBeijing 100083China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan ProvinceChangsha University of Science and TechnologyChangsha 410114China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2021年第33卷第6期

页      面：1242-1254页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Projects supported by the National Natural Science Foundation of China(Grant Nos.41961144014,51836010) the Chinese Universities Scientific Fund(Grant No.2019TC133) 

主　　题：Analytical approximation asymmetric wave and current eddy viscosity mobile sediment bed oscillatory sheet flow 

摘      要：The oscillatory flow provides the major dynamic force for the mass and energy transport in estuary and coastal *** analytical approximate velocity formula is proposed to evaluate the oscillation in the boundary layer over the mobile sediment bed of the sheet flow induced by the asymmetric wave and *** velocity formula consists of an oscillatory force part and a constant force part corresponding to the Navier-Stokes equation of the asymmetric oscillatory sheet flow over the mobile sediment *** mobile sediment bed is defined by an erosion depth formula with consideration of the phase lag,the acceleration and the flow *** wave part includes the phase lead parameters from all components of the free stream *** development of the wave part is affected by the current part through the erosion depth and the boundary layer *** erosion depth,the roughness height and the boundary layer thickness of the mobile sediment bed are introduced into the current part without a transition area for the wave-current eddy *** current part is induced by the wave eddy viscosity within the boundary layer and influenced by the wave-current apparent roughness outside the boundary *** velocity profile and duration are evaluated by an approximate velocity formula through experiments for both asymmetric wave and wave-current *** oscillation feature in the boundary layer is illustrated by the approximate velocity formula through the asymmetric wave cases over the mobile sediment bed.