Numerical simulation of total sediment under waves and currents in the Changjiang Estuary

DING Ping-xing; HU Ke-lin; KONG Ya-zhen; ZHU Shou-xian

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DING Ping-xing, HU Ke-lin, KONG Ya-zhen, ZHU Shou-xian. Numerical simulation of total sediment under waves and currents in the Changjiang Estuary[J]. Haiyang Xuebao, 2003, 25(5): 113-124.

Citation:

DING Ping-xing, HU Ke-lin, KONG Ya-zhen, ZHU Shou-xian. Numerical simulation of total sediment under waves and currents in the Changjiang Estuary[J]. Haiyang Xuebao, 2003, 25(5): 113-124.

DING Ping-xing, HU Ke-lin, KONG Ya-zhen, ZHU Shou-xian. Numerical simulation of total sediment under waves and currents in the Changjiang Estuary[J]. Haiyang Xuebao, 2003, 25(5): 113-124.

Citation:

DING Ping-xing, HU Ke-lin, KONG Ya-zhen, ZHU Shou-xian. Numerical simulation of total sediment under waves and currents in the Changjiang Estuary[J]. Haiyang Xuebao, 2003, 25(5): 113-124.

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Numerical simulation of total sediment under waves and currents in the Changjiang Estuary

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2002-08-16
Rev Recd Date: 2002-11-25

Abstract

Abstract

According to the characteristics of the complicate bathymetry,hydrology and sediment movement in the Changjiang Estuary,a two-dimensional numerical model for total sediment transport and sedbed evolution under waves and currents are developed.Based on the rational calculation of currents in the study area,the method of shear stress is adopted to determine the source function in the suspended sediment diffusion equation.Through a series of the numerical experiments and the statistical analyses of the observed field data,a local coefficient,which can reflect the bottom material and consolidation,is introduced into the classic critical erosion velocity of the sediment. The floc settling velocity of sediment particles is taken as the function of current velocity,salinity and suspended sediment concentration,which can improve the calculation precision of the suspended sediment numerical simulation in the Changjiang Estuary.In the computation of bed-load sediment transport,a rational method for determining the related parameters is developed.The verification of hydrology and sediment data shows that the model can preferably reflect the current field,sediment field and bathymetry evaluation in the Changjiang Estuary.
- waves and currents,
- suspended sediment and bed-load sediment,
- numerical simulation

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References(27)

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