三峡水库干流消落带沉积泥沙粒径特征及其物源意义

doi:10.11870/cjlyzyyhj201609013

Abstract

Abstract: The main aim of this study is to reveal the regularity and the sources of sediment deposition in the riparian zone of the main stream in the Three Gorges Reservoir. Using in-situ observations and laser particle analyzer, we investigated the particle size of the deposited sediment and its variation in horizontal, vertical and elevational directions in the riparian zone of the Three Gorges Reservoir, and compared the characteristics of grain size between deposited sediment and suspended sediment to reveal the source of deposited sediment studied. The results show that:(1) sediment deposited in the riparian zone of perennial reservoir was significantly finer than that in the fluctuating backwater area, and particle size gradually became finer along the horizontal flow direction and is almost stable in Zhongxian County and its lower reach; (2) fine sediments usually occupied a larger proportion with increasing elevation, but coarse sediments also had great opportunities to take the advantage on the top of the riparian zone if soil erosion above the zone was intense and strong; (3) cyclic layering of the sediment profile was easy to observe in the riparian zone at the end of the reservoir where median size was larger and appears a wider range of variation, while the median size and related range of variation get smaller and cyclic layering of the sediment profile gradually disappeared towards the downstream; (4) deposited sediments in riparian zone of the fluctuating backwater area mainly came from external sources such as Jinsha River and Jialing River, internal sources made greater contribution to coarse sediments in the perennial reservoir area but couldn't be dominant in fine sediments since external sources are also able to supply sufficient matters which makes the source of fine sediments complex and diverse.

Key words: particle size, deposited sediment, spatial variability, sediment sources, riparian zone

CLC Number:

TV145

WANG Bin-yan, YAN Dong-chun, WEN An-bang, CHEN Jia-cun. SEDIMENT PARTICLE SIZE IN RIPARIAN ZONE OF THE THREE GORGES RESERVOIR AND ITS IMPLICATION ON SOURCES[J].RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2016, 25(09): 1421-1429.

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SEDIMENT PARTICLE SIZE IN RIPARIAN ZONE OF THE THREE GORGES RESERVOIR AND ITS IMPLICATION ON SOURCES

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