Sediment dynamic processes of salt marsh creek and adjacent tidal-flats on the Dafeng coast, Jiangsu Province, China

LI Zhan-hai; GAO Shu; KE Xian-kun; WANG Ya-ping

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LI Zhan-hai, GAO Shu, KE Xian-kun, WANG Ya-ping. Sediment dynamic processes of salt marsh creek and adjacent tidal-flats on the Dafeng coast, Jiangsu Province, China[J]. Haiyang Xuebao, 2005, 27(6): 75-82.

Citation:

LI Zhan-hai, GAO Shu, KE Xian-kun, WANG Ya-ping. Sediment dynamic processes of salt marsh creek and adjacent tidal-flats on the Dafeng coast, Jiangsu Province, China[J]. Haiyang Xuebao, 2005, 27(6): 75-82.

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Sediment dynamic processes of salt marsh creek and adjacent tidal-flats on the Dafeng coast, Jiangsu Province, China

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China
3.
Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China;Department of Geography, University of Regina, Regina S4S 0A2, Canada

Received Date: 2004-07-29
Rev Recd Date: 2005-04-16

Abstract

Abstract

On the basis of the measurements of current velocities and suspended sediment concentrations within a tidal creek,together with analysis of surficial sediment samples collected from the creek and the adjacent Sueada salsa flats on 27 and 29 July 2002,at Wang gang,Jiangsu coast,characteristics of water and suspended sediment transport rates within the creek and the relationship between suspended and seabed sediments were analyzed.The results show that there is remarkable flood-ebb time-asymmetry for the tidal current,with variations in the suspended sediment concent ration and the rate of water/sediment transport.The marsh surface supplied water quantity accounts for 33% of the ebb water quantity in the creek,resulting in 20% of the ebb suspended sediment discharge in the creek during the ebb.This is a basic influence on the time asymmetry.Consequently,within a tidal cycle,the net water and suspended sediment discharges in the creek are opposite to those for the marsh surface,i.e.,they dominated.Silt and clay are the dominant components of the suspended and seabed sediments,accounting for more than 95% uri.The difference in grain size distribution between the suspended sediment within the creek and the bed sedimenton the adjacent marsh surface is very small.Variations in the suspended sediment concentration during the tidal cycle show that a substantive amount of the suspended sediments settles onto the marsh surface;the suspended sediments are the major source of seabed sediments.Therefore,the grain size distributions of seabed and suspended sediments are very close and there is a good exponential relationship between the grain size and the ratio of the content of the component associated with the grain size in the seabed sediment to that in the suspended sediment.
- Sueada salsa flat,
- tidal creek,
- flood-ebb time-asy mmetry,
- marsh surface supplied creek water mass

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References(24)

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