Instantaneous sediment transport formula for sheet flow beneath asymmetric wave and current  

作　　者：Xin-yu Hu Zhong-hua Weng Xin Chen Hai-fei Liu 

机构地区：[1]The Key Laboratory of Water and Sediment Sciences of Ministry of Education,School of Environment,Beijing Normal University,Beijing100875,China [2]Pearl River Water Resources Research Institute,Pearl River Water Resources Commission,Guangzhou 510611,China [3]College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China

出　　处：《Journal of Hydrodynamics》2022年第4期712-724,共13页水动力学研究与进展B辑（英文版）

基　　金：the Key Laboratory of Water and Sediment Sciences of Ministry of Education,Beijing Normal University(Grant No.SS202103);the National Natural Science Foundation of China(Grant No.41961144014).

摘　　要：An instantaneous formula is obtained for the sheet flow transport beneath the wave and the current by a product integration of the concentration and velocity profiles over the mobile seabed. The formula involves: (1) The product of the erosion depth and the free stream velocity, which can be reduced to the Shields parameter of power 3/2 in accordance with the classical formulae. (2) The ratio of the wave boundary layer thickness to the erosion depth. The formula incorporates the effects of the acceleration and the phase lag on the erosion depth, the asymmetric wave boundary layer and the wave-current interaction. The validation of the formula is made by the data obtained from the oscillatory tunnels covering a wide range of wave-current and sediment conditions. The instantaneous sediment transport rate is compared with the power function of the velocity with different exponents. The formula consists of a wave force part and a current force part and their relative importance depends on the wave shapes. The present formula gives very good results for the net sediment transport as compared to several existing steady and unsteady formulae. The net sediment transport rates are affected by not only the acceleration, the phase lag and the wave-current interaction, but also the asymmetric boundary layer development.

关 键 词：Boundary layer thickness erosion depth instantaneous formula sediment transport rate wave and current 

分 类 号：TV142[水利工程—水力学及河流动力学]