工程地质学报
工程地質學報
공정지질학보
2010年
1期
78-83
,共6页
堰塞湖%溃坝%数值模拟%Fluent
堰塞湖%潰壩%數值模擬%Fluent
언새호%궤패%수치모의%Fluent
Dam-break%Numerical simulation%FLUENT%Yigong landslide%River flooding
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.
滑坡堰塞壩體主要由塊石、碎石土等鬆散材料組成,隨著上遊水位的不斷上升,極易失穩,一旦決口將對給下遊人民的生命財產安全造成極大的威脅.因此,研究堰塞壩潰壩問題具有重要的學術意義和應用價值.2000年4月9日,西藏林芝地區波密縣易貢藏佈河扎木弄溝髮生大規模山體滑坡堵塞易貢藏佈江,形成壩高60m,長約2500m,庫容可達288×10~8m~3,體積約2.8×10~8～3.0×10~8m~3的滑坡堰塞湖,2000年6月10日堰塞壩潰決.本文以易貢堰塞湖潰壩為例,從連續性方程及Navier-Stokes方程齣髮,結閤標準型湍流模型,併採用VOF方法進行自由麵處理,基于流體計算軟件Fluent模擬分析瞭潰壩洪水在下遊彎麯河道的縯進過程及不同位置的流速變化.數值模擬結果與實測資料記錄基本一緻,錶明該模型能夠模擬潰壩洪水在地形複雜彎麯河道中的縯進過程.
활파언새패체주요유괴석、쇄석토등송산재료조성,수착상유수위적불단상승,겁역실은,일단결구장대급하유인민적생명재산안전조성겁대적위협.인차,연구언새패궤패문제구유중요적학술의의화응용개치.2000년4월9일,서장림지지구파밀현역공장포하찰목롱구발생대규모산체활파도새역공장포강,형성패고60m,장약2500m,고용가체288×10~8m~3,체적약2.8×10~8～3.0×10~8m~3적활파언새호,2000년6월10일언새패궤결.본문이역공언새호궤패위례,종련속성방정급Navier-Stokes방정출발,결합표준형단류모형,병채용VOF방법진행자유면처리,기우류체계산연건Fluent모의분석료궤패홍수재하유만곡하도적연진과정급불동위치적류속변화.수치모의결과여실측자료기록기본일치,표명해모형능구모의궤패홍수재지형복잡만곡하도중적연진과정.
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, 2000. 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.
