Scalar transport by propagation of an internal solitary wave over a slope-shelf  

作　　者：Jin Xu Ling-ling Wang Hong-wu Tang Zhu Hai John James Reginald Williams 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hobai University,Nanjing 210098,China [2]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China [3]School of Engineering and Materials Science,Queen Mary University of London,London,UK

出　　处：《Journal of Hydrodynamics》2019年第2期317-325,共9页水动力学研究与进展B辑（英文版）

基　　金：the National Key Research and Development Program of China(Grant Nos.2016YFC0401703,2017YFC0405605);the National Natural Science Foundation of China(Grant Nos.51879086,51609068 and 51709126).

摘　　要：Internal solitary waves(ISWs)of depression are commonly found in the coastal environment and are believed to re-suspend sediments in coastal regions where the waves break.In this research,the direct numerical simulation is used to study the scalar transport induced by the ISWs of depression propagating over a slope-shelf topography.The scalar in this paper is considered to represent the concentrations of very fine suspended solids or pollutants.Vortices are observed from the numerical results at the bottom boundary layer on the slope during the ISW shoaling process,resulting in a scalar transport.All in cident ISWs of depression are observed to produce a waveform inversion on the shelf.The scalar transport from a slope to a shelf is the consequence of the combined vortices at the bottom boundary layer and the overturning of the ISWs of depression,and the latter was commonly ignored in previous studies.This study shows that the ISW-induced scalar transport consists of the following four stages:the slip transport,the wash transport,the vortex transport,and the secondary transport.A dimensionless time scales of the four stages are calculated,and the beginning times of the wash transport and the secondary transport are found to be uncorrelated with the slope gradients,taking values of 1.26,4,respectively.

关 键 词：Internal SOLITARY waves slope-shelf SCALAR TRANSPORT wave inversion DIMENSIONLESS time scale 

分 类 号：O3[理学—力学]