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Draining Tangjiashan Barrier Lake after Wenchuan Earthquake and the flood propagation after the dam break

查看全文 作　　者：LIU Ning1, ZHANG JianXin2, LIN Wei3, CHENG WuYI4 & CHEN ZuYu5 1 Ministry of Water Resources of the People’s Republic of China, Beijing 100053, China;2 Bureau of Hydrology of the Ministry of Water Resources of the People’s Republic of China, Beijing 100053, China;3 Sichuan Hydrographic and Water Resources Survey Bureau;Chengdu 610031, China;4 HydroChina Chengdu Engineering Corporation, Chengdu 610072, China;5 China Institute of Water Resources and Hydropower Research, Beijing 100044, China 高影响力作者 出　　处：《Science China(Technological Sciences)》索引2009年第52卷第4期,共8页高影响力期刊 基　　金：Supported by the National Basic Research Program of China ('973' Project) (Grant No. 2007CB714102) 摘　　要：Tangjiashan Barrier Lake is one of the largest barrier lakes caused by the Wenchuan Earthquake. Its risk analysis, emergency plan and effect of the emergency plan are introduced in this paper. The dam height of Tangjiashan Barrier Dam is about 105 m, and the reservoir storage capacity is 3.2×108 m3. When the dam broke the flood peak were estimated to be larger than 48000 m3/s, which might cause a enormous disaster to the downstream cities and residents. A discharge channel with 13 m deep and 8 m wide was drug, so that the water may flow out of the lake before the dam breaks. As a result, the drainage and risk mitigation project are successful. During the drainage process, the flood peak was about 6500 m3/s, and about 1.6×108 m3 of water was drained off and the residual reservoir capacity was only 8.97×107 m3. A new channel with average width 100 m was formed, which can bear floods of 200 years frequency. The successful experience and the collected data can be used to deal with the similar natural disasters in future. 关 键 词：earthquake barrier LAKE DAM BREAK LANDSLIDE EROSION hydraulics of open channels
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