Long-term morphodynamic changes of a desert reach of the Yellow River following upstream large reservoirs' operation
文献类型：期刊论文
| 作者 | Ta, Wanquan; Mao, Honglang; Dong, Zhibao |
| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2008-05-15 |
| 卷号 | 97期号:3-4页码:249-259 |
| 关键词 | desert channel aggradation windblown sand reservoir Ulan Buh desert Yellow River |
| ISSN号 | 0169-555X |
| DOI | 10.1016/j.geomorph.2007.08.008 |
| 通讯作者 | Ta, Wanquan(tawq@ns.lzb.ac.cn) |
| 英文摘要 | China's Yellow River has experienced its dramatically decreasing trend for the flow discharge since the construction and operation of large reservoirs located upstream. This low flow regulation has triggered a severe aggradation of the Ulan Buh Desert channel of the Yellow River because the declining flow exhibits no capability to scour and carry away large amount input of desert sands from the Ulan Buh Desert. Twenty monitoring cross-sections documemcd the Ulan Buh Desert channel has experienced its increasing aggradational trend in conjunction with its lateral migration decreasing trend from 1966 to 2005, which is opposite to the normal pattern of aggradation with deepening or symmetrical infilling for a channel located downstream of a reservoir. The channel aggradation can also be identified two stages: slow aggradation and rapid aggradation. Slow aggradation is characterized by the channel bed elevation rising 9.5 cm on average between 1968 and 1985, which responded to the operation of the Liujiaxia reservoir. During this period, the flow discharge was similar to pre-dam flow conditions but the sediment transport reduced to half of its pre-dam value. Because of about 0.24 x 10(8) t of desert sands entering the channel from the Ulan Buh Desert annually, this dilute flow indicated not to scour the channel as expected, but contrarily to cause the channel aggraded. Rapid aggradation followed completion of the Longyangxia reservoir with the channel bed elevation rising by 73 cm on average between 1986 and 2005. In this period, the combined regulation of Liujiaxia and Longyangxia reservoirs has caused the flow discharge decreasing dramatically, which is more beneficial for accumulation of the desert sands (0.19 x 10(8) t yr(-1) on average) in the desert channel, and led to the channel aggradation rate accelerated rapidly. (C) 2007 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | CHANNEL ; SEDIMENT ; IMPACTS ; ADJUSTMENTS ; DISCHARGE ; EROSION |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000256719500001 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556056 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Ta, Wanquan |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ta, Wanquan,Mao, Honglang,Dong, Zhibao. Long-term morphodynamic changes of a desert reach of the Yellow River following upstream large reservoirs' operation[J]. GEOMORPHOLOGY,2008,97(3-4):249-259. |
| APA | Ta, Wanquan,Mao, Honglang,&Dong, Zhibao.(2008).Long-term morphodynamic changes of a desert reach of the Yellow River following upstream large reservoirs' operation.GEOMORPHOLOGY,97(3-4),249-259. |
| MLA | Ta, Wanquan,et al."Long-term morphodynamic changes of a desert reach of the Yellow River following upstream large reservoirs' operation".GEOMORPHOLOGY 97.3-4(2008):249-259. |
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来源：寒区旱区环境与工程研究所
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