The vertical sedimentary structure and its implications for environmental evolutions in the Changjiang Estuary in China

ZHANG Rui; WANG Ya-ping; GAO Jian-hua; PAN Shao-ming; ZHANG Zhi-lin

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ZHANG Rui, WANG Ya-ping, GAO Jian-hua, PAN Shao-ming, ZHANG Zhi-lin. The vertical sedimentary structure and its implications for environmental evolutions in the Changjiang Estuary in China[J]. Haiyang Xuebao, 2008, 30(2): 80-91.

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The vertical sedimentary structure and its implications for environmental evolutions in the Changjiang Estuary in China

1.
Key Laboratory of Education of Ministry for Coastal and Island Development, Nanjing University, Nanjing 210093, China;Department of Coastal Ocean Science, School of Geographical and Marine Scienees, Nanjing University, Nanjing 210093, China
2.
Changjiang River Estuary Inversity Bureau of Hydrology and Water Conservancy, Changjiang Water Resource Commission, Ministry of Water Resources, Shanghai 200136, China

Received Date: 2007-06-26
Rev Recd Date: 2007-07-29

Abstract

Abstract

The sediment grain-size and its fractal dimension of five cores collected in the Changjiang Estucary are analyzed,and then the environmental susceptive populations of grain-size are extracted. It is shown that the sediment cores can be divided into two parts according to the vertical sedimentary structure. The to ppart(i. e.,0~12 cm)is the active layer which has been reconstr ucted frequently by dynamic environ-ments. The lower part from top of 12 cm to bottom,is char acterized by coarse-fine sediment cycles. In addition,sediment is mainly composed of two susceptive populations of grain-size with 6.0~7.2 and 40.7~57.5 Lm respectively,in which the former(i. e.,6.0~7.2 Lm)is similar to grain-size of suspended sediment from the Changjiang River and the latter(i. e.,40.7~57.5 Lm)is asso ciated with the effects of storm surges,waves and tides,dams and irrigation of river basin. The seasonal varations of suspended matter(e. g.,sediment supply quantity and grain size)from the Changjiang River may play an important role which contributes to the grain-size distribution in this area. The sediment has fractal features at 0.9~20.3 Lm interval that is consistent with the changes of sediment grain-size index. Consequently,the fractal dimension of sediment grain-size can be an important potential index containing infor mation on the environ-mental evolution.
- grain size,
- sedimentary environment,
- fractal dimension,
- grain-size susceptive populations,
- Changjiang Estuary in China

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References(49)

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