IMHE OpenIR  > 山地灾害与地表过程重点实验室
Investigation of Post-Fire Debris Flows in Montecito
Cui, Yifei1; Cheng, Deqiang2,3; Chan, Dave4
Corresponding AuthorCheng, Deqiang(
AbstractDebris flows in a burned area, post-fire debris flows, are considered as one of the most dangerous geo-hazards due to their high velocity, long run-out distance, and huge destruction to infrastructures. The rainfall threshold to trigger such hazards is often reduced compared with normal debris flow because ashes generated by mountain fires reduce the permeability of the top soil layer, thus increasing surface runoff. At the same time, burnt material and residual debris have very poor geo-mechanical characteristics, e.g., their internal friction angle and cohesion are typically low, and thus an intense rainfall can easily trigger some debris flows. Studying post-fire debris flow enables us to get a deeper understanding of disaster management. In this paper, the debris flow that occurred in Montecito, California, USA, and was affected by the Thomas Fire was used as a case study. Five major watersheds were extracted based on the digital elevation model (DEM). Remote sensing images were used to analyze the wildfire process, the extent of the burned areas, and the burn severity. The hypsometric integral (HI) and short-duration rainfall records of the watersheds around Montecito when the post-fire debris flows occurred were analyzed. Steep terrain, loose and abundant deposits, and sufficient water supply are the important conditions affecting the formation of debris flows. Taking watersheds as the research objects, HI was used to describe the geomorphic and topographic features, open-access rainfall data was used to represent the water supply, and burn severity represented the abundance of material sources. An occurrence probability model of post-fire debris flow based on HI, short-duration heavy rainfall, and burn severity was developed by using a logistic regression model in post-fire areas. By using this model, the occurrence probability of the post-fire debris flow in different watersheds around Montecito was analyzed based on the precipitation with time. Especially, the change characteristics of occurrence probability of debris flows over time based on the model bring a new perspective to observe the obvious change of the danger of post-fire debris flows and it is very useful for early warning of post-fire debris flows.
Keywordpost-fire debris flow Montecito hypsometric integral logistic regression model rainfall Thomas Fire mountain hazard
Indexed BySCI
Funding Projectopening fund of the State Key Laboratory of Hydraulics and Mountain River Engineering[SKHL1609] ; Chinese Academy of Sciences[131551KYSB20160002] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-DQC006] ; Research Grants Council of Hong Kong[T22-603/15-N]
WOS Research AreaPhysical Geography ; Remote Sensing
WOS SubjectGeography, Physical ; Remote Sensing
WOS IDWOS:000458582700005
Funding Organizationopening fund of the State Key Laboratory of Hydraulics and Mountain River Engineering ; Chinese Academy of Sciences ; Key Research Program of Frontier Sciences, CAS ; Research Grants Council of Hong Kong
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCheng, Deqiang
Affiliation1.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Clear Water Bay, Hong Kong, Peoples R China
2.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada
Recommended Citation
GB/T 7714
Cui, Yifei,Cheng, Deqiang,Chan, Dave. Investigation of Post-Fire Debris Flows in Montecito[J]. ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,2019,8(1):18.
APA Cui, Yifei,Cheng, Deqiang,&Chan, Dave.(2019).Investigation of Post-Fire Debris Flows in Montecito.ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,8(1),18.
MLA Cui, Yifei,et al."Investigation of Post-Fire Debris Flows in Montecito".ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION 8.1(2019):18.
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