期刊
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
卷 121, 期 4, 页码 703-724出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JF003718
关键词
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资金
- U.S. National Science Foundation [1053504]
- Chinese Academy of Sciences [2011Y2ZA04]
- USC college merit fellowship
- GSA graduate research grant
- NSF
- Natural Environment Research Council [NE/G002665/1, NE/J01995X/1] Funding Source: researchfish
- Division Of Earth Sciences
- Directorate For Geosciences [1053504] Funding Source: National Science Foundation
- NERC [NE/J01995X/1, NE/G002665/1] Funding Source: UKRI
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 M-w 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 (xi) ranging from similar to 20% to similar 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 (90% of the total landslide volume) may be more significantly affected by landslide locations.
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