Wave Attenuation and Turbulence Driven by Submerged Vegetation Under Current-Wave Flow  

作　　者：HUANG Yu-ming Ding Lei WANG Yi-fei CHEN Ben YANG Xiao-yu DOU Xi-ping 

机构地区：[1]School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan,430072,China [2]Key Laboratory of Port,Waterway and Sedimentation Engineering of MOT,Nanjing Hydraulic Research Institute,Nanjing 210029,China

出　　处：《China Ocean Engineering》2024年第4期602-611,共10页中国海洋工程（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(2023YFC3208501);the National Natural Science Foundation of China(Grant Nos.U2340225,51979172);the Nanjing Hydraulic Research Institute Special Fund for Basic Scientific Research of Central Public Research Institutes(Y223002,Y220013);the CRSRI Open Research Program(Grant No.CKWV20221007/KY);the Post-Three Gorges Sediment Research Project of MWR(ProjectⅢ:Impact and Countermeasures of the Three Gorges Project on the Stability of the Shoal and Channel and Habitat of Yangtze River Estuary)。

摘　　要：A set of laboratory experiments are carried out to investigate the effect of following/opposing currents on wave attenuation.Rigid vegetation canopies with aligned and staggered configurations were tested under the condition of various regular wave heights and current velocities,with the constant water depth being 0.60 m to create the desired submerged scenarios.Results show that the vegetation-induced wave dissipation is enhanced with the increasing incident wave height.A larger velocity magnititude leads to a greater wave height attenuation for both following and opposing current conditions.Moreover,there is a strong positive linear correlation between the damping coefficientβand the relative wave height H_(0)/h,especially for pure wave conditions.For the velocity profile,the distributions of U_(min)and U_(max)show different patterns under combined wave and current.The time-averaged turbulent kinetic energy(TKE)vary little under pure wave and U_(c)=±0.05 m/s conditions.With the increase of flow velocity amplitude,the time-averaged TKE shows a particularly pronounced increase trend at the top of the canopy.The vegetation drag coefficients are obtained by a calibration approach.The empirical relations of drag coefficient with Reynolds and Keulegane-Carpenter numbers are proposed to further understand the wave-current-vegetation interaction mechanism.

关 键 词：wave attenuation rigid vegetation following and opposing currents turbulent kinetic energy 

分 类 号：P753[交通运输工程—港口、海岸及近海工程] TV131.2[天文地球—海洋科学] Q948.8[水利工程—水力学及河流动力学]