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三峡水库库尾重庆主城区河段冲淤特性
引用本文:朱玲玲,李俊,袁晶.三峡水库库尾重庆主城区河段冲淤特性[J].长江科学院院报,2018,35(5):142-146.
作者姓名:朱玲玲  李俊  袁晶
作者单位:长江水利委员会 a.水文局,武汉 430010;b.长江上游水文水资源勘测局, 重庆 400021
基金项目:国家重点研发计划项目(2016YFC0402101),三峡水库科学调度关键技术研究项目(241202006)
摘    要:重庆主城区河段是西南地区水陆交通枢纽,其河道泥沙冲淤关系到防洪、航运及码头作业等一系列问题,是三峡水库泥沙问题的重点内容之一。三峡水库175 m试验性蓄水后,该河段位于库尾段,年内水力特性显著改变,河床冲淤规律相应发生变化。依据实测水沙及河道原型观测资料,对比研究了近15 a天然状态下和三峡水库175 m水位试验性蓄水后河段的泥沙冲淤变化。结果表明:自然状态下重庆主城区河段以冲刷为主,汛后走沙、汛期淤积规律明显,且汛后为主走沙期;三峡水库175 m水位试验性蓄水后至2012年河床冲刷强度下降,主走沙期推迟至汛前消落期;2013年以来上游来沙大幅减少使得河段冲刷强度增大。研究成果可为三峡水库优化调度和重庆主城区河段的规划治理提供参考。

关 键 词:三峡水库    重庆主城区河段  泥沙冲淤  175  m水位试验性蓄水  主走沙期  来沙条件  
收稿时间:2017-08-29

Sediment Erosion and Deposition in the Tail Area of Three Gorges Reservoir
ZHU Ling-ling,LI Jun,YUAN Jing.Sediment Erosion and Deposition in the Tail Area of Three Gorges Reservoir[J].Journal of Yangtze River Scientific Research Institute,2018,35(5):142-146.
Authors:ZHU Ling-ling  LI Jun  YUAN Jing
Affiliation:1.Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China;2.Bureau of Hydrology and Water Resources Survey in the Upstream of Yangtze River,Changjiang Water Resources Commission, Chongqing 400021, China
Abstract:Chongqing reach is well known as the land and water transport hub in southeast China. Sediment erosion and deposition in Chongqing reach, as related to flood control, navigation and dock operation, is a core issue in thedemonstration phase of Three Gorges Reservoir (TGR). Since the water level in front of Three Gorges Dam reached175 m, the hydraulic characteristics and sediment erosion and deposition in Chongqing reach, as the tail area of theTGR, has changed prominently. According to prototype observation data, the sediment scour and silting in Chonqingreach from 2003 to 2016 when the water level in front of Three Gorges Dam increased from 145 m to 175 mwas compared and analyzed. Results showed that in natural condition, sediment erosion dominated the Chongqingreach, with sediment always silting in flood season and scouring after flood season. From 2009 to 2012, the intensityof river bed scour in Chongqing reach decreased, and the erosion period delayed to seasons before flood of thenext year. As sediment yield greatly declined after the operation of cascade hydropower stations in the lower JinshaRiver, scour is very likely to occur again in Chongqing reach. The research results are expected to provide referencefor the operation of TGR and the planning and regulation of Chongqing reach.
Keywords:Three Gorges Reservoir  Chongqing reach  sediment erosion and deposition  175 m experimental water storage level  main sediment erosion period  incoming sediment  
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