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Rainfall characteristics and thresholds for periglacial debris flows in the Parlung Zangbo Basin, southeast Tibetan Plateau
Deng MF(邓明枫); Chen NS(陈宁生); Ding HT(丁海涛)
2018
Source PublicationJournal of Earth System Science
ISSN2347-4327
EISSN0973-774X
Volume127Pages:11
SubtypeArticle
Contribution Rank1
Abstract

The Parlung Zangbo Basin in the southeastern Tibet Plateau is affected by the summer monsoon from the Indian Ocean, which produces large rainfall gradients in the basin. Rainfall data during 2012–2015 from five new meteorological stations are used to analyse the rainfall characteristics. The daily rainfall, rainfall duration, mean rainfall intensity, and peak rainfall intensity are consistent, but sometimes contrasting. For example, these values decrease with increasing altitude, and the gradient is large downstream and small upstream, respectively. Moreover, the rainfall intensity peaks between 01:00 and 06:00 and increases during the afternoon. Based on the analysis of 14 debris flow cases in the basin, differences in the rainfall threshold differ depending on the location as sediment varieties. The sediment in the middle portions of the basin is wet and well structured; thus, long-duration, high-intensity rainfall is required to generate debris flows. Ravels in the upstream area are arid and not well structured, and short-duration rainfall is required to trigger debris flows. Between the above two locations, either long-duration, low-intensity rainfall or short-duration, high-intensity rainfall could provoke debris flows. Clearly, differences in rainfall characteristics and rainfall thresholds that are associated with the location must be considered in debris flow monitoring and warnings.

KeywordRainfall Characteristics Runoff Generated Threshold Debris Flows Southeast Tibetan Plateau
MOST Discipline Catalogue理学::地理学 ; 理学::地质学
DOI10.1007/s12040-017-0913-0
Indexed BySCI
Language英语
Quartile4区
Funding ProjectNational Natural Science Foundation of China[41402283]
TOP
WOS IDWOS:000426596600011
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24275
Collection山地灾害与地表过程重点实验室
Corresponding AuthorChen NS(陈宁生)
Recommended Citation
GB/T 7714
Deng MF,Chen NS,Ding HT. Rainfall characteristics and thresholds for periglacial debris flows in the Parlung Zangbo Basin, southeast Tibetan Plateau[J]. Journal of Earth System Science,2018,127:11.
APA Deng MF,Chen NS,&Ding HT.(2018).Rainfall characteristics and thresholds for periglacial debris flows in the Parlung Zangbo Basin, southeast Tibetan Plateau.Journal of Earth System Science,127,11.
MLA Deng MF,et al."Rainfall characteristics and thresholds for periglacial debris flows in the Parlung Zangbo Basin, southeast Tibetan Plateau".Journal of Earth System Science 127(2018):11.
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