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Rainfall threshold for initiation of channelized debris flows in a small catchment based on in-site measurement
Wei, Zhenlei1; Shang, Yuequan1; Zhao, Yu1; Pan, Pan1; Jiang, Yuanjun2
Corresponding AuthorYu Zhao
2017-01-30
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
Volume217Pages:23-34
SubtypeArticle
Abstract

The peak runoff discharge plays an important role in triggering channelized debris flows, especially for small catchments, due to the features of a small area and short channels. In small catchments, intense rainfall can trigger a flood within a short period of time. But currently, there are few rainfall threshold models that address the runoff from short-duration (<2 h) rainfall. In this context, 37 short-duration rainfall events were analyzed, and field measurements were made for a partially-modified landscape in order to compare the variation in the amount of runoff. The grey relational analysis allowed us to rank the influence of the various factors that affected variations in the runoff. The results indicated that the intensity of rainfall was the most important factor, having a greater effect than other factors, such as the depth of the rainfall and its duration. Then, we trained a runoff prediction model based on these factors and verified its accuracy using the moving least squares (MLS) method, the genetic back-propagation neural network (GABP) method and the genetic support vector machine (GASVM) method. This analysis indicated that the MLS method had the best predictive capability. The assessment of the debris-flow hazard based on the predicted runoff and intensity-duration-frequency (IDF) curves is discussed in the study area. It was indicated that even a rainfall event of a two-year return period was dangerous for this specific case. (C) 2016 Elsevier B.V. All rights reserved.

KeywordDebris Flow Small Catchment Rainfall Characteristics Runoff Prediction Rainfall Threshold
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.enggeo.2016.12.003
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS KeywordGREY RELATIONAL ANALYSIS ; WENCHUAN EARTHQUAKE AREA ; INDUCED LANDSLIDES ; PERFORMANCE-CHARACTERISTICS ; SHALLOW LANDSLIDES ; RUNOFF ; CHINA ; PREDICTION ; FREQUENCY ; DOLOMITES
Language英语
Quartile3区
TOP
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000393245400003
Funding OrganizationNational Natural Science Foundation of China(41272336 ; Zhejiang Provincial Natural Science Foundation(LY16D020002) ; 51208461)
Accession numberAccession number:20170203225290
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18411
Collection山地灾害与地表过程重点实验室
Affiliation1.Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Zhejiang, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Peoples R China
Recommended Citation
GB/T 7714
Wei, Zhenlei,Shang, Yuequan,Zhao, Yu,et al. Rainfall threshold for initiation of channelized debris flows in a small catchment based on in-site measurement[J]. ENGINEERING GEOLOGY,2017,217:23-34.
APA Wei, Zhenlei,Shang, Yuequan,Zhao, Yu,Pan, Pan,&Jiang, Yuanjun.(2017).Rainfall threshold for initiation of channelized debris flows in a small catchment based on in-site measurement.ENGINEERING GEOLOGY,217,23-34.
MLA Wei, Zhenlei,et al."Rainfall threshold for initiation of channelized debris flows in a small catchment based on in-site measurement".ENGINEERING GEOLOGY 217(2017):23-34.
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