不同降雨强度下红色村干沟泥石流数值研究  

Numerical Study on Debris Flow Under Different Rainfall Intensities at Gangou in Hongse Village,Dujiangyan

作　　者：匡翠萍[1] 王佳元[1] 刘格非[2] 郝文辉[3] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]台湾大学土木工程系,台湾台北10012 [3]河北省地矿局秦皇岛矿产水文工程地质大队,河北秦皇岛066001

出　　处：《同济大学学报（自然科学版）》2015年第7期1012-1018,共7页Journal of Tongji University:Natural Science

基　　金：河北省科学技术研究与发展计划(11276709D);海洋公益性科研专项(201305003-5)

摘　　要：结合实测资料分析了四川省都江堰市红色村干沟泥石流的运动规律,并运用DEBRIS-2D软件建立了二维泥石流运动数学模型,利用该模型模拟得到的龙头标高、平均堆积厚度及沟口流速都与实测基本吻合.通过改变雨强进行定量分析得到:当物源充足时,雨强减小会导致泥石流运动减缓,并停止于地势较高处;以150mm·h-1为参考雨强,当雨强减小为100mm·h-1和50mm·h-1时,泥石流运动的龙头标高分别增加25m和75m,平均堆积厚度分别减小0.06m和0.14m.The movement of debris flow occurred at Gangou in Hongse Village of Dujiangyan City of Sichuan Province was analyzed with field measurements.A two-dimension numerical model of the debris flow was set up with DEBRIS-2D software to simulate the debris flow in the region.It is shown that computational results and on-site observations are in good agreement.Different scenarios of the debris flow spreading caused by different rainfall intensities were also simulated.The results quantitatively reveal that with abundant debris source,the reduction of rainfall intensity leads to a slower movement and a higher stop position of debris flow.Taking the rainfall intensity of 150 mm·h^-1 as a reference,if the rainfall intensity reduces to 100 mm·h^-1 and 50 mm·h^-1,the increase on final front position will be 25 m and 75 m respectively and the reduction on average deposit thickness will be 0.06 m and 0.14 m respectively.

关 键 词：泥石流 数值模拟 雨强 龙头标高 平均堆积厚度 

分 类 号：P954[天文地球—自然地理学]