Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area | |
Guo, Xiaojun1,2,3; Cui, Peng1,2,4; Li, Yong1,2; Zhang, Jianqiang1,2; Ma, Li5; Mahoney, William B.6 | |
刊名 | LANDSLIDES |
2016-10-01 | |
卷号 | 13期号:5页码:1215-1229 |
关键词 | Debris flow I-D relationship Spatial distribution Rainfall Wenchuan earthquake |
ISSN号 | 1612-510X |
通讯作者 | Cui, Peng |
英文摘要 | The 2008 Wenchuan earthquake greatly altered the thresholds for rainfall-triggered debris flows within the affected area. Debris flows were widely and densely distributed, and they exhibited a range of differing local rainfall thresholds. This study looked at 518 debris flow events that occurred post-earthquake in order to analyze their spatial characteristics. The duration D (in h) and the average rainfall intensity I (in mm/h) that triggered the debris flows were determined for 252 of these events in order to analyze the spatial features of rainfall thresholds. Results show that 49 % of debris flows occurred in the highest-intensity seismic zone, 58 % occurred within 10 km of active faults, and 49 % occurred in areas with humid climate. Rainfall thresholds in these three regions were persistently lower than others. Moreover, debris flows were most frequent in watersheds smaller than 5 km(2), and rainfall thresholds tended to decrease with a decrease in watershed size. Given the abundant loose materials available throughout the study area, 11 extreme debris flow-prone sub-regions were selected to illustrate the spatial features of rainfall thresholds in relation to local climate conditions. The lowest and highest I-D thresholds in the sub-regions examined were I = 5.94D (-0.70) (2 < D < 53) and I = 21.4D (-0.58) (3 < D < 50), respectively. The lowest and mean rainfall intensities needed to trigger debris flows were power-related with the local maximum 1- and 24-h rainfall. By normalizing the rainfall intensity (I) by mean annual precipitation (MAP), the I (MAP)-D thresholds were determined. Normalized results showed that the lowest and highest I (MAP)-D thresholds were I (MAP) = 0.0034D (-0.55) (2 < D < 53) and I (MAP) = 0.0090D (-0.40) (3 < D < 51), respectively. Such results are useful for debris flow forecasting based on empirical rainfall thresholds and have implications for hazard and risk assessment in this region. |
WOS标题词 | Science & Technology ; Technology ; Physical Sciences |
类目[WOS] | Engineering, Geological ; Geosciences, Multidisciplinary |
研究领域[WOS] | Engineering ; Geology |
关键词[WOS] | SHALLOW LANDSLIDES ; DURATION CONTROL ; CHINA ; INTENSITY ; INITIATION ; UPDATE ; NEPAL |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000385174600026 |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/18127] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Hazards, Chengdu 610041, Peoples R China 2.Asian Network Debris Flow, Chengdu 610041, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Ctr Excellencein Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 5.Sichuan Meteorol Adm, Chengdu 610072, Peoples R China 6.Int Eros Control Assoc, Denver, CO 80207 USA |
推荐引用方式 GB/T 7714 | Guo, Xiaojun,Cui, Peng,Li, Yong,et al. Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area[J]. LANDSLIDES,2016,13(5):1215-1229. |
APA | Guo, Xiaojun,Cui, Peng,Li, Yong,Zhang, Jianqiang,Ma, Li,&Mahoney, William B..(2016).Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area.LANDSLIDES,13(5),1215-1229. |
MLA | Guo, Xiaojun,et al."Spatial features of debris flows and their rainfall thresholds in the Wenchuan earthquake-affected area".LANDSLIDES 13.5(2016):1215-1229. |
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