Controls on fluvial evacuation of sediment from earthquake-triggered landslides | |
Li, Gen5; West, A. Joshua5; Wang, Jin1,2,6; Jin, Zhangdong1,4; Hilton, Robert G.2; Zhang, Fei1; Densmore, Alexander L.2,3 | |
刊名 | GEOLOGY
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2015-02-01 | |
卷号 | 43期号:2页码:115-118 |
ISSN号 | 0091-7613 |
DOI | 10.1130/G36157.1 |
文献子类 | Article |
英文摘要 | 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关键词 | 2008 Wenchuan Earthquake ; Central Taiwan ; New-zealand ; Erosion ; Delivery ; Rates |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | GEOLOGICAL SOC AMER, INC |
WOS记录号 | WOS:000352095800005 |
内容类型 | 期刊论文 |
源URL | [http://ir.ieecas.cn/handle/361006/9353] ![]() |
专题 | 地球环境研究所_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 Durham, Inst Hazard Risk & Resilience, Durham DH1 3LE, England 4.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China 5.Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Gen,West, A. Joshua,Wang, Jin,et al. Controls on fluvial evacuation of sediment from earthquake-triggered landslides[J]. GEOLOGY,2015,43(2):115-118. |
APA | Li, Gen.,West, A. Joshua.,Wang, Jin.,Jin, Zhangdong.,Hilton, Robert G..,...&Densmore, Alexander L..(2015).Controls on fluvial evacuation of sediment from earthquake-triggered landslides.GEOLOGY,43(2),115-118. |
MLA | Li, Gen,et al."Controls on fluvial evacuation of sediment from earthquake-triggered landslides".GEOLOGY 43.2(2015):115-118. |
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