Impact of the Three Gorges Project operation on the water exchange between Dongting Lake and the Yangtze River  

作　　者：Minglong Dai Jun Wang Mingbo Zhang Xi Chen 

机构地区：[1]School of Hydropower & Information Engineering,Huazhong University of Science and Technology [2]Bureau of Hydrology,Changjiang Water Resources Commission

出　　处：《International Journal of Sediment Research》2017年第4期506-514,共9页国际泥沙研究（英文版）

基　　金：financially supported by the National Basic Research Program of China (973 Program) (Grant no. 2012CB417001);the National Key Research Program of China (Grant no.2016YFC0400901)

摘　　要：The Three Gorges Project（TGP） is a world known project to utilize and manage the water resources of the Yangtze River. The reservoir stores water at the end of the flood season, and replenishes downstream reaches with water in dry seasons. In addition to such benefits, the TGP has irreversibly changed the hydrological process and the river-lake relation of the middle and lower reaches. In this paper, a hydrodynamic model was established to quantify the impact of the TGP’s operation on the water exchange between Dongting Lake and the Yangtze River during 2009-2013. The results indicated that:the operation of the TGP has considerably reduced the peak discharge and the flood volume of the main stream and the Dongting Lake area. The inflow volume from the Yangtze River to Dongting Lake via three outlets decreased by 1.9-3.5 billion m;/yr, while the outflow volume from Dongting Lake to the Yangtze River at Chenglingji increased by 0.3-1.6 billion m;in September and 0.4-0.6 billion m;in October,respectively. This research provides valuable information for flood control, irrigation, and water allocation in the middle and lower reaches of the Yangtze River, and serves as a typical case for investigating the impact of other hydropower projects around the world.The Three Gorges Project(TGP) is a world known project to utilize and manage the water resources of the Yangtze River. The reservoir stores water at the end of the flood season, and replenishes downstream reaches with water in dry seasons. In addition to such benefits, the TGP has irreversibly changed the hydrological process and the river-lake relation of the middle and lower reaches. In this paper, a hydrodynamic model was established to quantify the impact of the TGP's operation on the water exchange between Dongting Lake and the Yangtze River during 2009-2013. The results indicated that:the operation of the TGP has considerably reduced the peak discharge and the flood volume of the main stream and the Dongting Lake area. The inflow volume from the Yangtze River to Dongting Lake via three outlets decreased by 1.9-3.5 billion m^3/yr, while the outflow volume from Dongting Lake to the Yangtze River at Chenglingji increased by 0.3-1.6 billion m^3 in September and 0.4-0.6 billion m^3 in October,respectively. This research provides valuable information for flood control, irrigation, and water allocation in the middle and lower reaches of the Yangtze River, and serves as a typical case for investigating the impact of other hydropower projects around the world.

关 键 词：Three Gorges Project Yangtze River Dongting Lake Three outlets diversion Water exchange 

分 类 号：P333[天文地球—水文科学] TV61[水利工程—水文学及水资源]