Flood management of Dongting Lake after operation of Three Gorges Dam

作     者：Xi-jun Lai Zi-ming Wang 

作者机构：Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography&LimnologyChinese Academy of Sciences(CAS)Nanjing 210008China Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020Chin 

出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)

年 卷 期：2017年第10卷第4期

页      面：303-310页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0707[理学-海洋科学] 0815[工学-水利工程] 0813[工学-建筑学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：supported by the National Basic Research Program of China(973 Program Grant No.2012CB417000) 

主　　题：Three Gorges Dam Flood control Water level Hydrodynamic model Dongting Lake 

摘      要：Full operation of the Three Gorges Dam(TGD) reduces flood risk of the middle and lower parts of the Yangtze River Basin. However,Dongting Lake, which is located in the Yangtze River Basin, is still at high risk for potentially severe flooding in the future. The effects of the TGD on flood processes were investigated using a hydrodynamic model. The 1998 and 2010 flood events before and after the operation of the TGD, respectively, were analyzed. The numerical results show that the operation of the TGD changes flood processes, including the timing and magnitude of flood peaks in Dongting Lake. The TGD can effectively reduce the flood level in Dongting Lake, which is mainly caused by the flood water from the upper reach of the Yangtze River. This is not the case, however, for floods mainly induced by flood water from four main rivers in the catchment. In view of this, a comprehensive strategy for flood management in Dongting Lake is required. Non-engineering measures, such as warning systems and combined operation of the TGD and other reservoirs in the catchment, as well as traditional engineering measures, should be further improved. Meanwhile, a sustainable philosophy for flood control, including natural flood management and lake restoration, is recommended to reduce the flood risk.