气候变化领域集成服务门户(CCPortal): Decreasing Landslide Erosion on Steeper Slopes in Soil-Mantled Landscapes

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DOI	10.1029/2020GL087505
	Decreasing Landslide Erosion on Steeper Slopes in Soil-Mantled Landscapes
	Prancevic J.P.; Lamb M.P.; McArdell B.W.; Rickli C.; Kirchner J.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	Slope-stability models predict that steeper hillslopes require smaller hydrological triggers for shallow landslides to occur due to the added downslope pull of gravity, which should result in more frequent landslides and faster erosion. However, field observations indicate that landslide frequency does not consistently increase on steeper hillslopes. Here, we use measurements of 1,096 soil landslides in California and Switzerland, and a compilation of landslide geometries, to show that steeper hillslopes typically have thinner soils and that thin soils inhibit landslides due to enhanced roles of cohesion and boundary stresses. We find that the landscape-averaged landslide erosion depth peaks near the threshold slope for instability, and it drops to half that value on hillslopes that are just 5° to 10° steeper. We propose that faster rates of soil creep on steeper slopes cause thin and more stable soils, which in turn reduces landslide erosion, despite the added pull of gravity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Erosion; Soils; Boundary stress; Field observations; Landslide erosion; Landslide frequency; Measurements of; Shallow landslide; Soil-mantled landscapes; Stability models; Landslides; cohesion; creep; geometry; gravity; hillslope; landslide; slope; California; Switzerland; 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/170353
作者单位	Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland; Department of Earth and Planetary Science, UC Berkeley, Berkeley, CA, United States; Department of Geography, Planning, and Environment, Concordia University, Montreal, QC, Canada; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
推荐引用方式 GB/T 7714	Prancevic J.P.,Lamb M.P.,McArdell B.W.,et al. Decreasing Landslide Erosion on Steeper Slopes in Soil-Mantled Landscapes[J],2020,47(10).
APA	Prancevic J.P.,Lamb M.P.,McArdell B.W.,Rickli C.,&Kirchner J.W..(2020).Decreasing Landslide Erosion on Steeper Slopes in Soil-Mantled Landscapes.Geophysical Research Letters,47(10).
MLA	Prancevic J.P.,et al."Decreasing Landslide Erosion on Steeper Slopes in Soil-Mantled Landscapes".Geophysical Research Letters 47.10(2020).