IMHE OpenIR  > 山地灾害与地表过程重点实验室
Wang Jun; Yu Yan; Pan Huali; Qiao Cheng; Ou Guoqiang
Source Publicationjournalofmountainscience
AbstractThe Wenchuan earthquake generated strong surface disturbances and triggered a large number of loose deposits, resulting in the disaster-prone environment with special watershed hydrological characteristics. This paper was to propose a debris flow formation process and explore the permeability characteristics and critical hydrodynamic conditions of the loose deposits triggered by the earthquake. The Guo Juanyan gully (31A degrees 05'27aEuro(3) N to 31A degrees 05'46aEuro(3) N, 103A degrees 36'58aEuro(3) E to 103A degrees 37'09aEuro(3) E) in Du Jiangyan City, located in the meizoseismal areas of the Wenchuan earthquake, was chosen as the study area and the disaster-prone environment was analyzed. The formation process of the debris flow was first proposed using a stability analysis, and then, the permeability characteristics of loose deposits were determined via in situ permeability experiments. Finally, the critical 1 h rainfall was simulated through a distributed hydrological model and verified by field observations. The formation process of debris flow could be divided into three stages based on the relationship between the hydrodynamic force and loose deposit resistance. The critical 1 h rainfall amounts under three antecedent moisture conditions (I-dry, II-normal and Ill-wet) were 52 mm/h, 43 mm/h and 34 mm/h, respectively. This study proposed a debris flow formation process in the meizoseismal areas of the Wenchuan earthquake based on the stability analysis and defined the rainfall threshold for debris flow early warning at the local level, which is significant for debris flow mitigation and risk management.
Funding Project[international cooperation project of the Ministry of Science and Technology] ; [Key Laboratory of Mountain Hazards and Earth Surface Processes independent project funding] ; [National Natural Science Foundation]
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Wang Jun,Yu Yan,Pan Huali,et al. debrisflowformationprocessandcriticalhydrodynamicconditionsinthemeizoseismalareaofthewenchuanearthquake[J]. journalofmountainscience,2015,12(3):699.
APA Wang Jun,Yu Yan,Pan Huali,Qiao Cheng,&Ou Guoqiang.(2015).debrisflowformationprocessandcriticalhydrodynamicconditionsinthemeizoseismalareaofthewenchuanearthquake.journalofmountainscience,12(3),699.
MLA Wang Jun,et al."debrisflowformationprocessandcriticalhydrodynamicconditionsinthemeizoseismalareaofthewenchuanearthquake".journalofmountainscience 12.3(2015):699.
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