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	Field observation of debris-flow activities in the initiation area of the Jiangjia Gully, Yunnan Province, China
	YANG Hong-juan1; ZHANG Shao-jie1; HU Kai-heng1; WEI Fang-qiang2; WANG Kai1; LIU Shuang1
	2022-06-01
摘要	The Jiangjia Gully, which is located in Dongchuan District, Yunnan Province, China, is a watershed prone to debris flows and has long-term recorded data of debris-flow occurrence. However, the initiation mechanism has mainly been studied by experiments in this watershed. To further reveal debris-flow formation mechanism in the Jiangjia Gully, debris-flow activities in the initiation zone were observed with hand-held video cameras in the summer of 2016 and 2017. In these two years, six debris-flow events were triggered in Menqian Gully, a major tributary of the Jiangjia Gully, while debris-flow activities in some sub-watersheds of Menqian Gully were recorded with video cameras in four events. The video recording shows that landslides constituted an important source for sediment supply in debris flow. Some landslides directly evolved into debris flows, while the others released sediment into rills and channels, where debris flows were generated for sediment entrainment by water flow. Therefore, debris-flow occurrence in the Jiangjia Gully is influenced both by infiltration-dominated processes and by runoff-dominated processes. In addition, rainfall data from four gauges installed in Menqian Gully were analyzed using mean intensity (I), duration (D), peak 10-minute rainfall (R-10min) and antecedent rainfall (AR) up to 15 days prior to peak 10-minute rainfall. It reveals that debris-flow triggering events can be discriminated from non-triggering events either by an I-D threshold or by an R-10min-AR threshold. However, false alarms can be greatly reduced if these two kinds of thresholds are used together. Moreover, behaviors including intermittency of debris flow, variance in moisture content and volume among surges, and coalescence of multiple surges by temporary damming were observed, indicating the complexity of debris-flow initiation processes. These findings are expected to enhance our knowledge on debris-flow formation mechanism in regions with similar environmental settings.
关键词	Debris flow Field observation Initiation mechanism Rainfall threshold Jiangjia gully
DOI	10.1007/s11629-021-7292-3
发表期刊	JOURNAL OF MOUNTAIN SCIENCE
ISSN	1672-6316
卷号	19期号:6页码:1602-1617
通讯作者	ZHANG Shao-jie(sj-zhang@imde.ac.cn)
收录类别	SCI
WOS记录号	WOS:000819035700009
语种	英语