南京大学学报（自然科学版）Issue(5)：646-655,10.DOI:10.13232/j.cnki.jnju.2014.05.013
典型潮汐水道悬沙浓度的潮控机理模拟分析
Simulation and analysis of the tidal control mechanism of suspended sediment concentrations in a typical tidal channel
摘要
Abstract
Based on the measurements of water level,tidal currents and suspended sediment concentrations(SSCs)in the Xiyang sub-tidal channel,Jiangsu coast,within the radial sand ridges of the South Yellow Sea,which were carried out by the MOE Key Laboratory for Coast and Island Development in 2012,the time series of current velocities, near-bed shear stress and SSCs were analyzed.An equilibrium SSC model was established that includes the various feedback mechanisms and,on such a basis,the impact of different parameters on the characteristic SSC level was e-valuated.The results indicate that:(1)in the study area,for most time during a tidal cycle,the near-bed shear stress exceeds the critical shear stress for initial sediment motion,with active resuspension of seabed sediment;(2 )under the conditions associated with the local hydrodynamics and sediment dynamics,the SSC will reach equilibrium after several tidal cycles,at which the erosion and deposition fluxes will be balanced over a spring-neap tidal cycle;(3)a low settling velocity of sedimentary particles is associated with a low equilibrium SSC level;and(4)a high seabed erosion coefficient results in a high equilibrium SSC level.Therefore,the characteristic SSC is controlled not only by the flow intensity,but also by the sediment properties (i.e.,particle size and viscosity that influence the settling velocity and the erosion coefficient).关键词
悬沙浓度/潮汐作用/数值模拟/均衡态/潮汐水道/江苏海岸Key words
suspended sediment concentrations/tidal action/numerical simulation/equilibrium/sub-tidal channels/Jiangsu coast引用本文复制引用
徐琦琳,高抒,王文昊,高建华,杨旸,徐杨佩云..典型潮汐水道悬沙浓度的潮控机理模拟分析[J].南京大学学报（自然科学版）,2014,(5):646-655,10.基金项目
海洋公益性行业科研专项经费(201005006),江苏省自然科学基金重点专项(BK2011012) （201005006）
