Coarse and fine sediment transportation patterns and causes downstream of the Three Gorges Dam

查看全文 作　　者：Songzhe [1]LI;Yunping [1,2]YANG;Mingjin [2]ZHANG;Zhaohua [3]SUN;Lingling [4]ZHU;Xingying [5]YOU;Kanyu [6]LI

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;[2]Key Laboratory of Engineering Sediment,Tianjin Resear_ch Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China;[3]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;[4]Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,China;[5]Hubei Provincial Water Resources and Hydropower Planning Survey and Design Institute,Wuhan 430064,China;[6]Changjiang Waterway Bureau,Wuhan 430010,China

出　　处：《Frontiers of Earth Science》索引2018年第12卷第4期,共15页

摘　　要：Reservoir construction within a basin affects the process of water and sediment transport downstream of the dam.The Three Gorges Reservoir (TGR)affects the sediment transport downstream of the dam.The impound- ment of the TGR reduced total downstream sediment.The sediment group d≤0.125mm (fine particle)increased along the path,but the average was still below what existed before the reservoir impoundment.The sediments group d>0.125mm (coarse particle)was recharged in the Yichang to Jianli reach,but showed a deposition trend downstream of Jianli.The coarse sediment in the Yichang to Jianli section in 2003 to 2007 was above the value before the TGR impoundment.However,the increase of both coarse and fine sediments in 2008 to 2014 was less than that in 2003 to 2007.The sediment retained in the dam is the major reason for the sediment reduction downstream. However,the retention in different river reaches is affected by riverbed coarsening,discharge,flow process,and conditions of lake functioning and recharging from the tributaries.The main conclusions derived from our study are as follows:1)The riverbed in the Yichang to Shashi section was relatively coarse,thereby limiting the supply of fine and coarse sediments.The fine sediment supply was mainly controlled by TGR discharge,whereas the coarse sediment supply was controlled by the duration of high flow and its magnitude.2)The supply of both coarse and fine sediments in the Shashi to Jianli section was controlled by the amount of total discharge.The sediment supply from the riverbed was higher in flood years than that in the dry years.The coarse sediment tended to deposit,and the deposition in the dry years was larger than that in the flood years.3)The feeding of the fine sediment in the Luoshan to Hankou section was mainly from the riverbed.The supply in 2008 to 2014 was more than that in 2003 to 2007. Around 2010,the coarse sediments transited from depositing to scouring that was probably caused by the increased duration of high flow days.4)Fine sediments appeared to be deposited in large amounts in the Hankou to Jiujiang section.The coarse sediment was fed by the riverbed scouting,and much more coarse sediments were recharged from the riverbed in the flood years than in the dry years.5)In the Jiujiang to Datong section,the ratio of fine sediments from the Poyang Lake and that from the riverbed was 1:2.82.The sediment from the riverbed scouring contributed more to the coarse sediment trans- portation.The contribution was mainly affected by the input by magnitude and duration of high flows. 关键词：grouped SEDIMENTS genetic analysis Three Gorges reservoir TRANSPORTATION characteristics MIDDLE and lower reaches of YANGTZE River

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Coarse and fine sediment transportation patterns and causes downstream of the Three Gorges Dam

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