Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea

	Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea
	Hu, Bangqi 1,2; Yang, Zuosheng 1,2; Wang, Houjie 1,2; Sun, Xiaoxia 1,2; Bi, Naishuang 2; Li, Guogang 3
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2009
卷号	13 期号:11 页码:2253-2264
ISSN号	1027-5606
英文摘要	The Three Gorges Dam (TGD) on the upper Changjiang (Yangtze River), China, disrupts the continuity of Changjiang sediment delivery to downstream and coastal areas. In this study, which was based on 54 years of annual water and sediment data from the mainstream and major tributaries of Changjiang, sediment deposition induced by the TGD in 2003-2008 was quantified. Furthermore, we determined the theoretical trapping efficiency of the cascade reservoir upstream of the TGD. Its impact on Changjiang sediment flux in the coming decades is discussed. Results show that about 172 million tons (Mt) of sediment was trapped annually by the TGD in 2003-2008, with an averaged trapping efficiency of 75%. Most of the total sediment deposition, as induced by the TGD (88%), accumulated within the region between the TGD site and Cuntan. However, significant siltation (12% of the total sediment deposition) also occurred upstream of Cuntan as a consequence of the upstream extended backwater region of the TGD. Additionally, the Changjiang sediment flux entered a third downward step in 2001, prior to operation of the TGD. This mainly resulted from sediment reduction in the Jinshajiang tributary since the late 1990s. As the cascade reservoir is put into full operation, it could potentially trap 91% of the Jinshajiang sediment discharge and, therefore, the Jinshajiang sediment discharge would most likely further decrease to 14 Mt/yr in the coming decades. Consequently, the Changjiang sediment flux to the sea is expected to continuously decrease to below 90 Mt/yr in the near future, or only 18% of the amount observed in the 1950s. In the presence of low sediment discharge, profound impacts on the morphology of estuary, delta and coastal waters are expected.
WOS关键词	WORLDS RIVERS ; CHINA ; DISCHARGE ; RESERVOIR ; IMPACT ; OCEAN ; LOAD ; IMPOUNDMENT ; VARIABILITY ; DECLINE
WOS研究方向	Geology ; Water Resources
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000272232400018
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25144]
专题	自然资源部第一海洋研究所
通讯作者	Yang, Zuosheng
作者单位	1.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 2.Minist Educ, Key Lab Submarine Sci & Prospecting Tech KLSSET, Qingdao 266100, Peoples R China 3.State Ocean Adm, N China Sea Branch, Qingdao 266033, Peoples R China
推荐引用方式 GB/T 7714	Hu, Bangqi,Yang, Zuosheng,Wang, Houjie,et al. Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2009,13(11):2253-2264.
APA	Hu, Bangqi,Yang, Zuosheng,Wang, Houjie,Sun, Xiaoxia,Bi, Naishuang,&Li, Guogang.(2009).Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea.HYDROLOGY AND EARTH SYSTEM SCIENCES,13(11),2253-2264.
MLA	Hu, Bangqi,et al."Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea".HYDROLOGY AND EARTH SYSTEM SCIENCES 13.11(2009):2253-2264.