刘亚坤

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 水利学院副院长,水力学研究所所长,工程水力学实验室主任

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:水利工程系

学科:水力学及河流动力学

联系方式:0411-84708509

电子邮箱:liuyakun@dlut.edu.cn

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Rainfall-triggered mass movements on steep loess slopes and their entrainment and distribution

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论文类型:期刊论文

发表时间:2019-12-01

发表刊物:CATENA

收录刊物:SCIE

卷号:183

ISSN号:0341-8162

关键字:Mass movement; Soil erosion; Entrainment; Rainfall simulation experiments; Loess Plateau

摘要:Mass movements are predominant geomorphic processes on steep hillslopes. However, the mechanisms governing the erosion and entrainment of mass movements remain poorly understood. In this study, experiments on natural loess slopes were conducted to induce a series of mass movements under simulated rainfalls in the Liudaogou Catchment on the Loess Plateau of China. A novel topography meter was used to observe random mass movements. A total of 499 mass movements in 42 rainfall events and an average of 11 mass movements for each rainfall event were observed. Three mass movement types were detected: landslides (67%) > mudflows (21%) > avalanches (12%). The volume of landslides dramatically increased through the entrainment of a wet gully bed material, and the volume of landslide mass was magnified by 29% on average through material entrainment. Based on the observed data, the probability of mass movement occurrences decreased with the increasing mass movement volume in a power-law relationship. The critical rainfall amount for mass movement failure was approximately 25.6 mm at a rainfall intensity of 50 mm h(-1) . These results can serve as guides to mitigate geological hazards and assess erosion processes on steep loess slopes of the Loess Plateau.