Temporal and spatial variations in suspended sediment concentration and transport in the North Branch of the Yangtze Estuary

Zhang Erfeng; Chen Shenliang; Gu Guochuan; Yang Haifei; Wang Rusheng

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Zhang Erfeng, Chen Shenliang, Gu Guochuan, Yang Haifei, Wang Rusheng. Temporal and spatial variations in suspended sediment concentration and transport in the North Branch of the Yangtze Estuary[J]. Haiyang Xuebao, 2015, 37(9): 138-151.

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Temporal and spatial variations in suspended sediment concentration and transport in the North Branch of the Yangtze Estuary

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

Received Date: 2014-10-04
Rev Recd Date: 2015-04-01

Abstract

Abstract

Based on 4 synchronous hydrological measurements in flood and dry seasons,this paper researches the variations in suspended sediment concentration (SSC) in a tidal cycle,the vertical distribution of SSC,the longitudinal distribution of SSC,the suspended sediment transport,and their temporal and spatial differences in the North Branch of the Yangtze Estuary. The results indicate that the process of variations in SSC in a tidal cycle mainly presents M pattern (two peaks) during spring and medium tides. However,in the main channel of the lower reach mostly V pattern occurs during spring tide,and in the upper reach one-peak during flood pattern could occur in dry season. During neap tide,no-peak,one-peak,or two-peak patterns could occur. About the maximum and average SSC during flood and ebb,they are usually larger during flood in dry season,in flood season more likely larger during ebb in medium and neap tides particularly in neap tide. In the main channel of the lower reach they are more likely larger during ebb in spring tide. The vertical distribution of SSC and its variations in a tidal cycle are related to the variational pattern of SSC during spring and medium tides. For M-pattern SSC it has obvious difference between flood season and dry season. Longitudinally,the maximum SSC occurs nearby the reach between Lingdiangang and Sanhegang in the middle reach during dry season,however around Santiaogang in the lower reach during flood season. Regarding the net suspended sediment transport in a tidal cycle,it is usually landward in dry season particularly during spring and medium tides,in flood season mostly seaward in the middle and upper reaches,mostly landward during spring tide and likely seaward during medium and neap tides in the lower reach. In the main channel of the lower reach it is likely seaward during spring tide.
- suspended sediment concentration,
- suspended sediment transport,
- temporal and spatial variations,
- North Branch of the Yangtze Estuary

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References

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