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	Trends in suspended sediment grain size in the upper Yangtze River and its tributaries, as influenced by human activities
	Xu J. X.
	2007
关键词	suspended sediment load sediment grain size reservoir soil conservation upper Yangtze River china
英文摘要	Based on data from five hydrometric stations, Pingshan station on the Jinshajiang River, Gaochang station on the Minjiang River, Wulong station on the Wujiang River, Wusheng station on the Jialingjiang River and Yichang station on the Yangtze River, a Study has been made of the temporal variation in grain size of suspended sediment load in the upper Yangtze River. The results show that in the past 40 years, the grain size of the suspended sediment load in the main stern and major tributaries of the upper Yangtze River has had a decreasing trend, that can be explained by the effect of reservoir construction and implementation of soil conservation measures. The reservoirs in the upper Yangtze River Basin, all used for water storage for hydro-electric generation and/or irrigation, have trapped coarse sediment from the drainage area above the darn and, thus, the sediment released now is much finer than before the construction of the reservoirs. The downstream channels are all gravel-bedded or even in bedrock, with little fine sediment, and thus, the released flow can hardly get a supply of fine sediment through eroding the bed. Then, after the downstream adjustment, the grain size of suspended sediment is still fine. Large-scale soil conservation measures have significantly reduced sediment yield in some major sediment Source areas. The relatively coarse sediment is trapped and, thus, the sediment delivered to the river becomes finer.
出处	Hydrological Sciences Journal-Journal Des Sciences Hydrologiques
卷	52
期	4
页	777-792
收录类别	SCI
语种	英语
ISSN号	0262-6667
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22684]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu J. X.. Trends in suspended sediment grain size in the upper Yangtze River and its tributaries, as influenced by human activities. 2007.

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