气候变化领域集成服务门户(CCPortal): Characteristic landslide distributions: An investigation of landscape controls on landslide size

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DOI	10.1016/j.epsl.2020.116203
	Characteristic landslide distributions: An investigation of landscape controls on landslide size
	Medwedeff W.G.; Clark M.K.; Zekkos D.; West A.J.
发表日期	2020
ISSN	0012821X
卷号	539
英文摘要	Estimation of landslide erosion rates and hazard prediction require a firm understanding of the physical controls on landslide size. In this study we seek to understand how the characteristics of different landscapes and forcing events influence the distribution of landslide size at a regional scale. We explore the parameter space of a mechanically-based landslide model through a series of simulations using digital elevation data. Consistent with previous studies, we find that large slope failures are infrequent due to the scarcity of large, steep hillslopes in typical mountainous topography. On the other hand, we find that the occurrence of small landslides is limited by the cohesive strength of hillslope material, which overcomes the weaker driving forces on short slopes. We test our model results with an empirical investigation of frequency-size distributions for eight real co-seismic landslide inventories. Although empirical data are noisy, we find a positive correlation between landslide size and hillslope relief, while the effects of PGA on landslide size are less pronounced. We conclude that landslide size distributions reflect the available distribution of hillslope geometries in a given landscape, and that external forcing (e.g., seismic ground motion) determines which subset of the hillslope distribution fails during a particular event. For a given landscape and forcing event, there is a particular length-scale over which landsliding is statistically favored, leading to the concept of characteristic landslide size distributions. © 2020 Elsevier B.V.
关键词	frequency-size scaling hillslope relief landslides lognormal power-law scale invariant
英文关键词	Seismology; Size distribution; Topography; Hillslopes; Log-normal; Power-law; Scale invariant; Size scaling; Landslides; frequency analysis; hillslope; landslide; numerical model; power law; size distribution; slope dynamics; slope failure
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202778
作者单位	Department of Earth and Environmental Sciences, Univ. of Michigan, 1100 North University Ave., Ann Arbor, MI 48109, United States; Department of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward Str., Ann Arbor, MI 48109, United States; Department of Earth Sciences, University of Southern California, 3651 Trousdale Parkway, Los Angeles, CA 90089, United States
推荐引用方式 GB/T 7714	Medwedeff W.G.,Clark M.K.,Zekkos D.,et al. Characteristic landslide distributions: An investigation of landscape controls on landslide size[J],2020,539.
APA	Medwedeff W.G.,Clark M.K.,Zekkos D.,&West A.J..(2020).Characteristic landslide distributions: An investigation of landscape controls on landslide size.Earth and Planetary Science Letters,539.
MLA	Medwedeff W.G.,et al."Characteristic landslide distributions: An investigation of landscape controls on landslide size".Earth and Planetary Science Letters 539(2020).