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Sediment texture and grain-size implications: the Changjiang subaqueous delta
作者姓名:ZHANG Rui  WANG Yaping  GAO Jianhu  PAN Shaoming
作者单位:MOE Key Laboratory of Coastal and Island Development, Nanjing University, Nanjing 210093, China;Department of Coastal Ocean Science, Nanjing University, Nanjing 210093, China 
基金项目:The National Basic Research Program of China under contract No 2002CB412401;;the National Natural Science Foundation of China under contract Nos 40876043 & 40106009;;the Jiangsu Natural Science Foundation under contract NoBK2006131;;the NCET Program under contract NoNCET-06-0446
摘    要:Sediment cores were collected from the subaqueous delta of the Changjiang Estuary. Sediment grain-size profiles and their fractal dimensions were analyzed, to elucidate responses to long-term sedimentary processes. In addition, the environmental sensitive populations of grain size have been extracted. The sediment cores can be divided into two parts, according to the sedimentary structures present. The upper part (0-12 cm) is interpreted as being the active layer, which is influenced frequently by changes i...

关 键 词:水下三角洲  泥沙粒度  长江口  沉积物粒度  环境敏感  纹理  沉积环境演化  分形维数
收稿时间:2008/7/28 0:00:00
修稿时间:2009/11/28 0:00:00

Sediment texture and grain-size implications: the Changjiang subaqueous delta
ZHANG Rui,WANG Yaping,GAO Jianhu,PAN Shaoming.Sediment texture and grain-size implications: the Changjiang subaqueous delta[J].Acta Oceanologica Sinica,2009,28(4):38-49.
Authors:ZHANG Rui  WANG Yaping  GAO Jianhua and PAN Shaoming
Affiliation:MOE Key Laboratory of Coastal and Island Development, Nanjing University, Nanjing 210093, China;Department of Coastal Ocean Science, Nanjing University, Nanjing 210093, China
Abstract:Sediment cores were collected from the subaqueous delta of the Changjiang Estuary. Sediment grain-size profiles and their fractal dimensions were analyzed, to elucidate responses to long-term sedimentary processes. In addition, the environmental sensitive populations of grain size have been extracted. The sediment cores can be divided into two parts, according to the sedimentary structures present. The upper part (0-12 cm) is interpreted as being the active layer, which is influenced frequently by changes in the short-term hydrodynamic environment. The lower part extends from a depth of 12 cm, to the bottom of the core. The pattern of fluctuation is linked to sediment grain size. Moreover, two grain-size sensitive populations can be identified. The fine sensitive population is 6.0-7.2 μm, which is a similar grain size to the suspended sediment from up-river. The coarse sensitive population varies from 40.7 to 57.5 μm, revealing complex changes. Thus, the riverine inputs from the Changjiang River may be an important source, which contributes to seasonal fluctuations of grain-size distribution, over the area. The sediments, with grain-sizes ranging from 0.9 to 20.3 μm, are characterised by self-similar in the fractal non-scale region. The fractal dimension is consistant with the grain-size parameter varatioins, which could be used as a replacement index to reveal and reconstruct the sedimentary environmental evolution.
Keywords:grain size  sedimentary environment  fractal dimension  grain-size sensitive popula-tions  Changjiang Estuary  
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