Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部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

	Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake
	Ma, Chao 1; Wang, Yujie 1; Hu, Kaiheng2 ; Du, Cui 3; Yang, Wentao 1
刊名	GEOMORPHOLOGY
	2017-04-01
卷号	282 页码:85-95
关键词	Debris flow Rainfall threshold Debris supply Wenchuan earthquake
ISSN号	0169-555X
通讯作者	YujieWang
英文摘要	Debris flows in the Wenchuan seismic region have caused human casualties and severe damage to local infrastructure. Consequently, the triggering rainfall threshold and erosion capability of post-quake debris flows has become an important research topic worldwide. In this study, we analyze five years of rainstorms and debris flow data from four typical earthquake-hit regions in order to examine the local rainfall intensity duration (ID) thresholds and debris supply conditions. It was found that debris flow events in the four seismic areas exhibited different I-D thresholds, related to local mean annual hourly precipitation and debris flow supply conditions. The I-D thresholds, normalized by mean annual maximum hourly rainfall, illustrate that post-quake rainfall thresholds were reduced by at least 30% compared to pre-quake levels. Regression analysis revealed a clear linear relationship between the debris supply condition and the empirical coefficient, a, of the I-D equation. This means that rainfall thresholds of post-quake debris flows in different areas are distinctive and are strongly affected by sediment volume. Different relationships between the entrainment rate and the debris volume per watershed area and its product with the channel gradient illustrate that stream sediments in Yingxiu and Dujiangyan are more eroded, and that local debris flows might persist over a shorter time than in Qingping and Beichuan in the future. Finally, debris flows in the studied area exhibit no tendency of reduction in erosion competence entrainment rate, as found in Taiwan, which might be indicative of a higher entrainment rate persisting for a longer time. (C) 2017 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	SHALLOW LANDSLIDES ; BURNED AREAS ; INITIATION ; VOLUME ; CHINA ; MOBILIZATION ; COLORADO ; RUNOFF ; TAIWAN ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000395959600008
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/18585]
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.Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China 3.Henan Univ Sci & Technol, Sch Civil Engn, Luoyang 471023, Peoples R China
推荐引用方式 GB/T 7714	Ma, Chao,Wang, Yujie,Hu, Kaiheng,et al. Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake[J]. GEOMORPHOLOGY,2017,282:85-95.
APA	Ma, Chao,Wang, Yujie,Hu, Kaiheng,Du, Cui,&Yang, Wentao.(2017).Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake.GEOMORPHOLOGY,282,85-95.
MLA	Ma, Chao,et al."Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake".GEOMORPHOLOGY 282(2017):85-95.