Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China

WANG Chu; HE Bao-gen; ZHOU Nai-sheng; XU Shi-yuan

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Article Navigation > Haiyang Xuebao > 2009 > 31(1): 143-151

WANG Chu, HE Bao-gen, ZHOU Nai-sheng, XU Shi-yuan. Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China[J]. Haiyang Xuebao, 2009, 31(1): 143-151.

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Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China
2.
Department of Geography, Shanghai Normal University, Shanghai 200234, China
3.
Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China

Received Date: 2008-08-18
Rev Recd Date: 2008-11-18

Abstract

Abstract

Between April 2002 and April 2003,time series measurements of water depth,current velocity and suspended sediment content(SSC)were carried out on the marsh fringe and adjacent mudflat of Chongming eastern beach in the Changjiang Estuary.Across-shore suspended sediment flux was calculated and analyzed.Under the calm weather condition,different types of the time series of current velocity between a salt marsh and a mudflat were observed during semidiurnal tidal cycles.Marsh vegetation reduced ebb currents,current velocity enhanced in flood on the salt marsh.Owing to current velocity asymmetry,mean SSC during flood phase was 1.8 times higher than ebb phase.As a result,net onshore sediment flux controlled cross-shore suspended sediment transport process and salt marsh pioneer zone was generally accreting.There was significant positive correlation between the total sediment flux and the quartic power of maximum water depth.It indicated that tidal frces dominate suspended sediment transport and sedim entation process in the salt marsh pioneer zone under the calm weather condition.Sedimentation rate on the adjacent mudflat was higher than the salt marsh,which induced stably accreting of salt marsh towards the sea.Wind events enhanced the SSC and the current velocity during the semidiurnal tides.And remarkable onshore net sediment flux could occur on the high marsh and mudflat close to the marsh fringe during the short period under the rough weather condition.
- current velocity,
- suspended sediment content,
- flux,
- salt marsh,
- eastern beach

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References

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