长江口南槽中段枯季水沙输运特征研究

doi:10.11870/cjlyzyyhj201612006

Abstract

Abstract: Based on the data of current velocity and suspended sediment concentration measured in the main channel of the South Passage the Changjiang estuary from January 7 to 14 in 2015, the mechanisms of water and suspended sediment transports during a neap-spring tide cycle are analyzed by using the mechanism decomposition method. Furthermore, the influence of the periodic variation of suspended sediment concentration and current velocity on the suspended sediment transport is also explored by the method of wavelet analysis. The results showed that (1) the net water transport in most tidal cycles was seaward at the measurement station, and the magnitudes of the Euler and Stokes residual current decreased gradually from the spring tide to the neap tide. (2) The net suspended sediment transport was landward in each tidal cycle; from spring tide to neap tide the magnitude of suspended sediment transport displayed a remarkable "small-big-small" variation pattern owing to the intensively tidal variation of the tidal pumping transport; advection and net vertical circulation transport terms also play an important role on the net sediment transport. (3) The results of the wavelet analysis showed that the temporal variations of suspended sediment concentration and current velocity displayed several variation periods; the combined effect of suspended sediment concentration, flow velocity and water level leaded to 2 obvious variation period in the instantaneous sediment transport rate.

Key words: water and suspended sediment transports, mechanism decomposition method, sediment transport rate, wavelet analysis, the south passage of the Changjiang Estuary

CLC Number:

TV147

ZHANG Zhao, LI Zhan-hai, ZHANG Guo-an, WANG Zhi-gang, YAO Jun. WATER AND SUSPENDED SEDIMENT TRANSPORTS IN THE MIDDLE REACH OF THE SOUTH PASSAGE IN THE CHANGJIANG ESTUARY DURING THE DRY SEASON[J].RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2016, 25(12): 1832-1841.

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WATER AND SUSPENDED SEDIMENT TRANSPORTS IN THE MIDDLE REACH OF THE SOUTH PASSAGE IN THE CHANGJIANG ESTUARY DURING THE DRY SEASON

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