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Research on Fluctuation of Suspended Sediment Concentration in Xuliujing Shoal and Groove of Yangtze River Estuary
  • Zhou Hao,
  • Shuguang Liu
Zhou Hao
Tongji University

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Shuguang Liu
Tongji University
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Abstract

In order to study the fluctuation law of suspended sediment concentration ( SSC) of different water layers in Xuliujing marginal shoal and deep groove of Yangtze River Estuary with time under spring, middle and neap tides, and analyze the relevant factors of SSC fluctuation in shoal and groove, so as to help calculate and calibrate line computation of SSC, infer continuous sediment transport rate and compilate sediment discharge in Xuliujing section, provide theoretical basis for scientific research on analysis of Yangtze Estuary channel erosion and deposition and river regime change, river regulation and wading projects plan. Used horizontal sampler, bottom sampler and other instruments to conduct on-site hydrological and sediment tests of 1#(marginal shoal) and 4#(deep groove) measuring verticals on Yangtze Estuary Xuliujing Section. The research conclusion: the maximum correlation between SSC and flow velocity reaches 90.5%, SSC fluctuation degree increases with the increase of flow velocity, SSC fluctuation peaks in marginal shoal mainly occur at high flow velocity, SSC fluctuation peaks in deep groove mainly occur at low flow velocity; The maximum correlation between SSC and water depth reaches 99.7%, fluctuation degree increases with the reduction of distance to bottom, fluctuation in marginal shoal is more violent than deep groove; Occurrence time of SSC fluctuation peaks is related to sediment d 50 and sediment transport between shoal and groove; Spring and middle tides are the time when shoal and groove SSC fluctuation degrees reach their maximum, 28h, 17h, 14h and 14h, 8h, 5h fluctuations are main patterns of shoal and groove SSC variation.