Numerical modeling of tidal currents,sediment transport and morphological evolution in Hangzhou Bay,China  

作　　者：Dong-feng XIE Shu GAO Zheng-bing WANG Cun-hong PAN 

机构地区：[1]Zhejiang Institute of Hydraulics & Estuary [2]Key Laboratory for Coast and Island Development,Ministry of Education,Nanjing University [3]Delft University of Technology,Faculty of Civil Engineering and Geosciences [4]Chang Jiang Scholar,State Key Laboratory of Estuarine and Coastal Research,East China Normal University

出　　处：《International Journal of Sediment Research》2013年第3期316-328,共13页国际泥沙研究（英文版）

基　　金：supported by the Natural Science Foundation of China(41006053,40231010);Zhejiang Province Key Science and technology Innovation Team Project(2010R50035)

摘　　要：A 2D depth-averaged numerical model is set up to simulate the macro-scale hydrodynamic characteristics,sediment transport patterns and morphological evolution in Hangzhou Bay,a large macro-tidal estuary on the eastern coast of China.By incorporating the shallow water equations,the suspended sediment transport equation and the mass-balance equation for sediment; short-term hydrodynamics,sediment transport and long-term morphological evolution for Hangzhou Bay are simulated and the underlying physical mechanisms are analyzed.The model reproduces the spatial distribution patterns of suspended sediment concentration （SSC） in Hangzhou Bay,characterized by three high SSC zones and two low SSC zones.It also correctly simulates the residual flow,the residual sediment transport and the sediment accumulation patterns in Hangzhou Bay.The model results are in agreement with previous studies based on field measurements.The residual flow and the residual sediment transport are landwards directed in the northern part of the bay and seawards directed in the southern part.Sediment accumulation takes place in most areas of the bay.Harmonic analysis revealed that the tide is flood-dominant in the northern part of the bay and ebb-dominant in the southern part of the bay.The strength of the flood-dominance increases landwards along the northern Hangzhou Bay.In turn sediment transport in Hangzhou Bay is controlled by this tidal asymmetry pattern.In addition,the direction of tidal propagation in the East China Sea,the presence of the archipelago in the southeast and the funnel-shaped geometry of the bay,play important roles for the patterns of sediment transport and sediment accumulation respectively.A 2D depth-averaged numerical model is set up to simulate the macro-scale hydrodynamic characteristics,sediment transport patterns and morphological evolution in Hangzhou Bay,a large macro-tidal estuary on the eastern coast of China.By incorporating the shallow water equations,the suspended sediment transport equation and the mass-balance equation for sediment; short-term hydrodynamics,sediment transport and long-term morphological evolution for Hangzhou Bay are simulated and the underlying physical mechanisms are analyzed.The model reproduces the spatial distribution patterns of suspended sediment concentration （SSC） in Hangzhou Bay,characterized by three high SSC zones and two low SSC zones.It also correctly simulates the residual flow,the residual sediment transport and the sediment accumulation patterns in Hangzhou Bay.The model results are in agreement with previous studies based on field measurements.The residual flow and the residual sediment transport are landwards directed in the northern part of the bay and seawards directed in the southern part.Sediment accumulation takes place in most areas of the bay.Harmonic analysis revealed that the tide is flood-dominant in the northern part of the bay and ebb-dominant in the southern part of the bay.The strength of the flood-dominance increases landwards along the northern Hangzhou Bay.In turn sediment transport in Hangzhou Bay is controlled by this tidal asymmetry pattern.In addition,the direction of tidal propagation in the East China Sea,the presence of the archipelago in the southeast and the funnel-shaped geometry of the bay,play important roles for the patterns of sediment transport and sediment accumulation respectively.

关 键 词：Hangzhou Bay Tidal currents Sediment dynamics ESTUARY MORPHOLOGY Numerical modeling 

分 类 号：TV148[水利工程—水力学及河流动力学]