Characteristics of grain-size distributions of suspended sediment and its response to dynamics over the Dafeng tidalflat, Jiangsu coast in China

LI Zhan-hai; GAO Shu; SHEN Huan-ting; WANG Ya-ping

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Article Navigation > Haiyang Xuebao > 2006 > 28(4): 87-95

LI Zhan-hai, GAO Shu, SHEN Huan-ting, WANG Ya-ping. Characteristics of grain-size distributions of suspended sediment and its response to dynamics over the Dafeng tidalflat, Jiangsu coast in China[J]. Haiyang Xuebao, 2006, 28(4): 87-95.

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Characteristics of grain-size distributions of suspended sediment and its response to dynamics over the Dafeng tidalflat, Jiangsu coast in 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

Received Date: 2005-01-20
Rev Recd Date: 2005-11-20

Abstract

Abstract

On the basis of the measurement of suspended sediment at several sites over the Dafeng tidalflat in the summer of 2002 and 2003, the northern Jiangsu coast, the spatio-temporal characteristics of grainsize distributions of suspended sediment and its response to resuspension, settling process and tidal current velocity are analyzed.The results show that the suspended sediment is mainly composed of fine and very fine silt, and the mean grain-size is 7~13 m.On the basis of the in-situ measurement data, the spatiotemporal variation models of the grain-size distributions of the suspended sediment during the tidal cycle can be summarized into two types, one is the stability type when the variation is insignificant and the other is the double-peak type when the variation is remarkable.The main factors that influence the grain-size distributions of the suspended sediment are resuspension, settling process suspended sediment imported into tidal flats during the flood phase and the grain-size distributions of seabed sediment.The resuspension can increase the coarse particles content and the mean grain-size of the suspended sediment and cause the grain-size distributions of the suspended sediment close to the seabed sediment; the effects of settling process on the suspended sediment are opposite to those of the resuspension.When the resuspension occurs, the variation of the gain-size distributions of the suspended sediment in the lower part of water column can reflect the process clearly, the mean grain-size of the suspended sediment has good linear relationships with the current velocity.Without the effects of resuspension and settling process.the grain-size distributions of the suspended sediment is inclined to be stable and invariable during the measurement period over different parts of tidal flats, the mean grain-size of the background suspended sediment over the Dafeng tidalflat is 7 μm.
- grain-size distributions of suspended sediment,
- resuspension,
- settling process,
- Dafeng tidalflat

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References(21)

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