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Connectivity of earthquake-triggered landslideswith the fluvial network: Implicationsfor landslide sediment transport afterthe 2008 Wenchuan earthquake
Li,G(Li,Gen)[1]; West,A.J(West,A.Joshua)[1]; Densmore,A L,(Densmore,Alexander L.)[2]; Hammond,D E.(Hammond, Douglas E.)[1]; Jin,ZD(Jin,Zhangdong)[3]; Zhang,F(Zhang,Fei)[3]; Wang,J(Wang,Jin)[3]; Hilton,R G.(Hilton,Robert G.)[2]
2016
Source PublicationJournal of Geophysical Research: Earth Surface
Volume121Issue:4Pages:703-724
Subtype期刊论文
Abstract

Evaluating the influence of earthquakes on erosion, landscape evolution, and sediment-related hazards requires understanding fluvial transport of material liberated in earthquake-triggered landslides. The location of landslides relative to river channels is expected to play an important role in postearthquake sediment dynamics. In this study, we assess the position of landslides triggered by the Mw 7.9 Wenchuan earthquake, aiming to understand the relationship between landslides and the fluvial network of the steep Longmen Shan mountain range. Combining a landslide inventory map and geomorphic analysis, we quantify landslide-channel connectivity in terms of the number of landslides, landslide area, and landslide volume estimated from scaling relationships. We observe a strong spatial variability in landslide-channel connectivity, with volumetric connectivity (ξ) ranging from ~20% to ~90% for different catchments. This variability is linked to topographic effects that set local channel densities, seismic effects (including seismogenic faulting) that regulate landslide size, and substrate effects that may influence both channelization and landslide size. Altogether, we estimate that the volume of landslides connected to channels comprises 43 + 9/ 7% of the total coseismic landslide volume. Following the Wenchuan earthquake, fine-grained (<~0.25 mm) suspended sediment yield across the Longmen Shan catchments is positively correlated to catchment-wide landslide density, but this correlation is statistically indistinguishable whether or not connectivity is considered. The weaker-than-expected influence of connectivity on suspended sediment yield may be related to mobilization of fine-grained landslide material that resides in hillslope domains, i.e., not directly connected to river channels. In contrast, transport of the coarser fraction (which makes up >90% of the total landslide volume) may be more significantly affected by landslide locations.

DOI10.1002/2015JF003718
Indexed BySCI
Language英语
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10828
Collection加速器质谱中心
Affiliation1.Department of Earth Sciences, University of Southern California, Los Angeles, California, USA;
2.Institute of Hazard, Risk andResilience and Department of Geography, Durham University, Durham, UK;
3.State Key Laboratory of Loess and QuaternaryGeology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
Recommended Citation
GB/T 7714
Li,G,West,A.J,Densmore,A L,,et al. Connectivity of earthquake-triggered landslideswith the fluvial network: Implicationsfor landslide sediment transport afterthe 2008 Wenchuan earthquake[J]. Journal of Geophysical Research: Earth Surface,2016,121(4):703-724.
APA Li,G.,West,A.J.,Densmore,A L,.,Hammond,D E..,Jin,ZD.,...&Hilton,R G..(2016).Connectivity of earthquake-triggered landslideswith the fluvial network: Implicationsfor landslide sediment transport afterthe 2008 Wenchuan earthquake.Journal of Geophysical Research: Earth Surface,121(4),703-724.
MLA Li,G,et al."Connectivity of earthquake-triggered landslideswith the fluvial network: Implicationsfor landslide sediment transport afterthe 2008 Wenchuan earthquake".Journal of Geophysical Research: Earth Surface 121.4(2016):703-724.
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