气候变化领域集成服务门户(CCPortal): Controls on the size distributions of shallow landslides

CCPortal

DOI	10.1073/pnas.2021855118
	Controls on the size distributions of shallow landslides
	Bellugi D.G.; Milledge D.G.; Cuffey K.M.; Dietrich W.E.; Larsen L.G.
发表日期	2021
ISSN	00278424
卷号	118 期号:9
英文摘要	Rainfall-triggered shallow landslides are destructive hazards and play an important role in landscape processes. A theory explaining the size distributions of such features remains elusive. Prior work connects size distributions to topography, but field-mapped inventories reveal pronounced similarities in the form, mode, and spread of distributions from diverse landscapes. We analyze nearly identical distributions occurring in the Oregon Coast Range and the English Lake District, two regions of strikingly different topography, lithology, and vegetation. Similarity in minimum sizes at these sites is partly explained by theory that accounts for the interplay of mechanical soil strength controls resisting failure. Maximum sizes, however, are not explained by current theory. We develop a generalized framework to account for the entire size distribution by unifying a mechanistic slope stability model with a flexible spatial-statistical description for the variability of hillslope strength. Using hillslope-scale numerical experiments, we find that landslides can occur not only in individual low strength areas but also across multiple smaller patches that coalesce. We show that reproducing observed size distributions requires spatial strength variations to be strongly localized, of large amplitude, and a consequence of multiple interacting factors. Such constraints can act together with the mechanical determinants of landslide initiation to produce size distributions of broadly similar character in widely different landscapes, as found in our examples. We propose that size distributions reflect the systematic scale dependence of the spatially averaged strength. Our results highlight the critical need to constrain the form, amplitude, and wavelength of spatial variability in material strength properties of hillslopes. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Landslide; Landslide size; Size distributions; Spatial variability
语种	英语
scopus关键词	article; landslide; Oregon; seashore; soil; topography; vegetation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180459
作者单位	Department of Geography, University of California, Berkeley, CA 94720, United States; School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Bellugi D.G.,Milledge D.G.,Cuffey K.M.,et al. Controls on the size distributions of shallow landslides[J],2021,118(9).
APA	Bellugi D.G.,Milledge D.G.,Cuffey K.M.,Dietrich W.E.,&Larsen L.G..(2021).Controls on the size distributions of shallow landslides.Proceedings of the National Academy of Sciences of the United States of America,118(9).
MLA	Bellugi D.G.,et al."Controls on the size distributions of shallow landslides".Proceedings of the National Academy of Sciences of the United States of America 118.9(2021).