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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
2015-02-01
发表期刊GEOLOGY
ISSN0091-7613
卷号43期号:2页码:115-118
文章类型Article
摘要

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标题词Science & Technology ; Physical Sciences
DOI10.1130/G36157.1
关键词[WOS]2008 Wenchuan Earthquake ; Central Taiwan ; New-zealand ; Erosion ; Delivery ; Rates
收录类别SCI
语种英语
WOS研究方向Geology
WOS类目Geology
WOS记录号WOS:000352095800005
出版者GEOLOGICAL SOC AMER, INC
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9354
专题加速器质谱中心
通讯作者Wang, Jin
作者单位1.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
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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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