干旱区生态环境知识资源中心(Arid): Formation-evolutionary mechanism of large debris flow in semi-arid region, the northeastern Tibetan Plateau

Arid

DOI	10.1007/s10346-024-02233-9
	Formation-evolutionary mechanism of large debris flow in semi-arid region, the northeastern Tibetan Plateau
	Jiang, Zhenni; Wang, Jiao; Zhou, Liqin; Yuan, Runjie; Wei, Tao; Zhang, Yifan
通讯作者	Wang, J
来源期刊	LANDSLIDES
ISSN	1612-510X
EISSN	1612-5118
出版年	2024
卷号	21 期号:7 页码:1515-1530
英文摘要	Debris flows can develop into mega catastrophes in semi-arid regions when the source materials come from landslides, and both snowmelt and precipitation are involved in increasing water discharge. In such environments, the formation of large-scale debris flows exhibits a distinguishable pattern, in which a multi-fold lower triggering rainfall threshold holds compared to humid regions. Previous research mainly focuses on mechanisms in humid environments or neglects variations across aridity classes. In this study, the formation and evolutionary mechanism of a debris flow occurring in a semi-arid context is investigated via field surveys, granularity measurement, terrain and climate analyses, and snow cover change detection. By examining the July 22, 2021, Xiao Dongsuo debris flow at Amidongsuo Park in the Qilian Ranges on the northeastern margin of the Tibetan Plateau, the mechanism of debris flows in semi-arid regions is revealed. The research finds that the large debris flow, whose course erosion scales up the disaster by 0.12 million m3, is primarily supplied by landslide deposits of 1.16 million m3. The debris flow is empowered by the integrated flow of extreme precipitation and extreme heat-stimulated snowmelt. However, the precipitation required to trigger the debris flow is much lower than that of precipitation-dominated ones and those in humid regions. In semi-arid mountains, prolonged extreme heat tends to increase soil moisture in areas covered by snow or permafrost. This reduces slope stability and induces slope failures, amplifying the disaster magnitude and raising disaster risks through extended deterioration. Hence, this study inspects the failure mechanism associated with debris flows in semi-arid regions for a more comprehensive understanding to constitute viable control plans for analogous disasters.
英文关键词	Large debris flow Semi-arid region Formation mechanism Extreme precipitation Permafrost
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001190177400001
WOS关键词	QILIAN MOUNTAINS ; SLOPE STABILITY ; CLIMATE-CHANGE ; SHEAR-STRESS ; SCALE ; INITIATION ; SINUOSITY ; RUNOFF ; RATES ; FAN
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404865
推荐引用方式 GB/T 7714	Jiang, Zhenni,Wang, Jiao,Zhou, Liqin,et al. Formation-evolutionary mechanism of large debris flow in semi-arid region, the northeastern Tibetan Plateau[J],2024,21(7):1515-1530.
APA	Jiang, Zhenni,Wang, Jiao,Zhou, Liqin,Yuan, Runjie,Wei, Tao,&Zhang, Yifan.(2024).Formation-evolutionary mechanism of large debris flow in semi-arid region, the northeastern Tibetan Plateau.LANDSLIDES,21(7),1515-1530.
MLA	Jiang, Zhenni,et al."Formation-evolutionary mechanism of large debris flow in semi-arid region, the northeastern Tibetan Plateau".LANDSLIDES 21.7(2024):1515-1530.