沟道泥流溃决式运动堆积过程二维数值试验  

Numerical Experiment Study on Gully Mud-flow Deposition in Dike Burst

作　　者：王协康[1] 刘同宦[1] 崔鹏[2] 

机构地区：[1]四川大学高速水力学国家重点实验室,四川成都610065 [2]中国科学院成都山地环境研究所,四川成都610041

出　　处：《四川大学学报（工程科学版）》2005年第2期1-4,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(40025103)

摘　　要：泥石流演化过程由于受其复杂运动特性的影响,还无法建立一个通用且有效的数值模拟方法。针对沟道泥流演化特性,以溃决式运动模化沟道泥流运动堆积过程。通过简单的数值算例,假定泥石沟床比降6%,沟道长100m,沟宽20m,网格大小为Δx=1.0m,Δy=1.0m,时间步长Δt=0.5s。假定来流为指数衰减模式,数值试验结果表明泥流堆积过程具有较为明显的龙头衰减过程,头部流速较大,泥深沿程呈现小-大-小的分布,且有较长的拖尾衰减现象。It is very difficult to establish a general numerical model for debris flow evolvement process because the natural debris flows often occur with different physical structure and evolving form. An approximation evolving process of mudflow in the gully has been modeled by means of 2D depth-average dike burst numerical model based on the depth-velocity corrected method like the SIMPLER. The distributions of depth and velocity of mudflow in a simple debris flow gully with 6% slope, 20 m width and 100 m length have been obtained assuming an initial and boundary conditions. The results show that the deposition has an obvious attenuation, and the mudflow flows faster in the front section. The depth of mud varies along the long trail.

关 键 词：泥流 溃决式运动 数值试验 

分 类 号：TV144[水利工程—水力学及河流动力学]