气候变化领域集成服务门户(CCPortal): The Impact of Sediment Supply on the Initiation and Magnitude of Runoff-Generated Debris Flows

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DOI	10.1029/2020GL087643
	The Impact of Sediment Supply on the Initiation and Magnitude of Runoff-Generated Debris Flows
	Tang H.; McGuire L.A.; Kean J.W.; Smith J.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Rainfall intensity-duration (ID) thresholds are commonly used to assess the potential for runoff-generated debris flows, but the sensitivity of these thresholds to sediment supply, which can change rapidly with time, is relatively unexplored. Furthermore, debris flows often self-organize into distinct surges, but the factors controlling the magnitude and frequency of these surges, including sediment supply and grain size, are poorly constrained. We use a combination of numerical modeling and debris flow monitoring data from Chalk Cliffs, Colorado, USA, to explore how sediment supply influences rainfall ID thresholds for debris flows and surge properties. Results suggest that rainfall ID thresholds only become sensitive to sediment supply below a sediment thickness threshold. Surge magnitude is a nonmonotonic function of sediment supply (i.e., channel bed sediment thickness and grain size) with the largest surges tending to form at intermediate values of sediment availability with intermediate grain sizes. ©2020. The Authors.
英文关键词	Debris; Grain size and shape; Rain; Sediments; Colorado , USA; Debris flow monitoring; Non-monotonic function; Rainfall intensity durations; Sediment availability; Sediment supply; Sediment thickness; Self-organize; Runoff; debris flow; frequency analysis; grain size; numerical method; precipitation intensity; runoff; sediment thickness; sedimentation; sensitivity analysis; storm surge; threshold; Colorado; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170111
作者单位	Section 4.7: Earth Surface Process Modelling, German Research Centre for Geosciences (GFZ), Potsdam, Germany; Department of Geosciences, The University of Arizona, Tucson, AZ, United States; U.S. Geological Survey, Golden, CO, United States
推荐引用方式 GB/T 7714	Tang H.,McGuire L.A.,Kean J.W.,et al. The Impact of Sediment Supply on the Initiation and Magnitude of Runoff-Generated Debris Flows[J],2020,47(14).
APA	Tang H.,McGuire L.A.,Kean J.W.,&Smith J.B..(2020).The Impact of Sediment Supply on the Initiation and Magnitude of Runoff-Generated Debris Flows.Geophysical Research Letters,47(14).
MLA	Tang H.,et al."The Impact of Sediment Supply on the Initiation and Magnitude of Runoff-Generated Debris Flows".Geophysical Research Letters 47.14(2020).