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易贡滑坡堰塞湖溃坝洪水分析
引用本文:邢爱国 ,徐娜娜 ,宋新远.易贡滑坡堰塞湖溃坝洪水分析[J].力学学报,2010,18(1):78.
作者姓名:邢爱国   徐娜娜   宋新远
作者单位:(上海交通大学土木工程系 上海 200240)
摘    要:滑坡堰塞坝体主要由块石、碎石土等松散材料组成,随着上游水位的不断上升,极易失稳,一旦决口将对给下游人民的生命财产安全造成极大的威胁。因此,研究堰塞坝溃坝问题具有重要的学术意义和应用价值。2000 年 4 月 9 日,西藏林芝地区波密县易贡藏布河扎木弄沟发生大规模山体滑坡堵塞易贡藏布江,形成坝高60m,长约2500m,库容可达288×108m3,体积约28×108~30×108m3的滑坡堰塞湖, 2000年6月10日堰塞坝溃决。本文以易贡堰塞湖溃坝为例,从连续性方程及Navier Stokes方程出发,结合标准型湍流模型,并采用VOF方法进行自由面处理,基于流体计算软件Fluent模拟分析了溃坝洪水在下游弯曲河道的演进过程及不同位置的流速变化。数值模拟结果与实测资料记录基本一致,表明该模型能够模拟溃坝洪水在地形复杂弯曲河道中的演进过程。

关 键 词:  />堰塞湖  溃坝  数值模拟  Fluent

NUMERICAL SIMULATION OF LAKE WATER DOWN STREAM FLOODING DUE TO SUDDEN BREAKAGE OF YIGONG LANDSLIDE DAM IN TIBET

,XING Aiguo〓XU Nana〓SONG Xinyuan.NUMERICAL SIMULATION OF LAKE WATER DOWN STREAM FLOODING DUE TO SUDDEN BREAKAGE OF YIGONG LANDSLIDE DAM IN TIBET[J].chinese journal of theoretical and applied mechanics,2010,18(1):78.
Authors:
  XING Aiguo〓XU Nana〓SONG Xinyuan
Institution:(Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai |200240)
Abstract:
The dam of the landslide debris barrier lake mainly consists of boulder and stony soil and it is more vulnerable to instability as the result of a rise in water level. The dam break may cause huge economic property and life loss. Therefore the study of dam break problem has important academic significance and application value. A high speed giant landslide occurred in Yigong River in the Bomi,Tibet,on April 9, 2〖CS%0,0,0,0〗〖CS〗000.A landslide dam was formed suddenly with 2500 m long, 2500 m wide and 60 m high, 280~300 million m3 in volume. A debris barrier lake was formed. Taking the dam break of Yigong barrier lake as an example,according to the continuity equation and Navier Stokes equation,combining with standard turbulence model,and tracking the free surface with VOF method,via computational fluid dynamics software Fluent,this paper analyzes the dam break flood evolution in downstream river course and the velocity changes at different sites. The simulation results are consistent with the observed data. At the same time,it shows that the model can simply simulate the flood evolution in the river bend with complex terrain after dam break. The study can provide the prevention of dam break disaster in terms of downstream flooding.
 
Keywords:Dam break     Numerical simulation     FLUENT  Yigong landslide  River flooding
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