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Controls on fluvial evacuation of sediment from earthquake-triggered landslides
Wang, Jin1,2,3; Jin, Zhangdong1,4; Hilton, Robert G.2; Zhang, Fei1; Densmore, Alexander L.2,5; Li, Gen6; West, A. Joshua6
Source PublicationGEOLOGY

Large earthquakes in active mountain belts can trigger landslides, which mobilize large volumes of clastic sediment. Delivery of this material to river channels may result in aggradation and flooding, while sediment residing on hillslopes may increase the likelihood of subsequent landslides and debris flows. Despite recognition of these processes, the controls on the residence time of coseismic landslide sediment in river catchments remain poorly understood. Here we assess the residence time of fine-grained (<0.25 mm) landslide sediment mobilized by the C.E. 2008 M-w 7.9 Wenchuan earthquake, China, using daily suspended sediment discharge measured in 16 river catchments from 2006-2012. Following the earthquake, suspended sediment discharge was elevated 3-7x compared to 2006-2007. However, the total 2008-2012 export (92.5 +/- 9.3 Mt from 68,719 km(2)) was much less than estimates of fine-grained sediment input by coseismic landslides (480 + 350/-338 Mt) determined by landslide area-volume scaling and deposit grain-size distributions. We estimate the residence time of fine-grained sediment in the affected river catchments using the post-earthquake rate of sediment export, and find that it ranges from one year to over a century. The first-order variability in fine-sediment residence time is proportional to the areal extent of coseismic landsliding, and is inversely proportional to the frequency of intense runoff events (>5 mm day(-1)). Together with previous observations from the C.E. 1999 Chi-Chi earthquake in Taiwan, our results demonstrate the importance of landslide density and runoff intensity in setting the duration of earthquake-triggered landslide impacts on river systems.

WOS HeadingsScience & Technology ; Physical Sciences
WOS Keyword2008 Wenchuan Earthquake ; Central Taiwan ; New-zealand ; Erosion ; Delivery ; Rates
Indexed BySCI
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000352095800005
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, Jin
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
2.Univ Durham, Dept Geog, Durham DH1 3LE, England
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
5.Univ Durham, Inst Hazard Risk & Resilience, Durham DH1 3LE, England
6.Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
Recommended Citation
GB/T 7714
Wang, Jin,Jin, Zhangdong,Hilton, Robert G.,et al. Controls on fluvial evacuation of sediment from earthquake-triggered landslides[J]. GEOLOGY,2015,43(2):115-118.
APA Wang, Jin.,Jin, Zhangdong.,Hilton, Robert G..,Zhang, Fei.,Densmore, Alexander L..,...&West, A. Joshua.(2015).Controls on fluvial evacuation of sediment from earthquake-triggered landslides.GEOLOGY,43(2),115-118.
MLA Wang, Jin,et al."Controls on fluvial evacuation of sediment from earthquake-triggered landslides".GEOLOGY 43.2(2015):115-118.
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