Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31580.1 |
Avulsion triggering by El Nino-Southern Oscillation and tectonic forcing: The case of the tropical Magdalena River, Colombia | |
Moron, Sara1,2; Amos, Kathryn1; Edmonds, Douglas A.3; Payenberg, Tobias4; Sun, Xun5,6; Thyer, Mark7 | |
2017-09-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA; Peoples R China |
英文摘要 | River avulsion is a complex multistage process, yet the causes of river avulsions are not well understood. Using four decades of satellite, climatic, and discharge data, we show that on the Magdalena River, Colombia, the frequency of crevasse splay and avulsion triggering increases during La Nina climatic events. Field investigation of an ongoing partial avulsion event that started in 2007 shows that it occurred due to the combined effects of climate and tectonic forcing. The avulsion event started with the formation of a crevasse splay, followed by-maintenance and expansion of one crevasse channel, in-filling of a lake, and development of a network of new channels. Based on topographic, bathymetric, and sedimentologic data, we determined that the location of the avulsion point is related to changes in the longitudinal profile caused by a fault; while on a reach scale, it is linked to the location of the channel's thalweg. We also show that while there is enough gradient to drive the avulsion, because crossvalley slope is larger than down-valley slope, levee height is not higher than channel depth, a criterion that has been proposed to be a necessary factor for avulsion. We show that the avulsion was triggered by frequent and high-discharge events related to the 2007-2008 and 2010-2011 extreme La Nina events. Our field data suggest a trade-off between avulsion setup and trigger, and that the necessary normalized superelevation needed to drive avulsion may decrease with an increase in the magnitude of the trigger. Moreover, our results provide insights into how global-scale climatic processes trigger avulsion, which is useful for hazard mitigation and for the interpretation of avulsive deposits preserved in the stratigraphic record. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000409330000017 |
WOS关键词 | EXTREME WEATHER ; WATER DISCHARGE ; FLUVIAL SYSTEMS ; SEDIMENT YIELD ; DRAINAGE-BASIN ; YELLOW-RIVER ; LAKE EYRE ; AUSTRALIA ; AMERICA ; FLOOD |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24562 |
专题 | 地球科学 |
作者单位 | 1.Univ Adelaide, Australian Sch Petr, Adelaide, SA 5000, Australia; 2.Univ Melbourne, Sch Earth Sci, Parkville, Vic 3010, Australia; 3.Indiana Univ, Dept Earth & Atmospher Sci, 1001 East 10th St, Bloomington, IN 47405 USA; 4.Chevron Australia Pty Ltd, Perth, WA 6000, Australia; 5.East China Normal Univ, Minist Educ, Key Lab Geog Informat Sci, Shanghai 200241, Peoples R China; 6.Columbia Univ, Earth Inst, Columbia Water Ctr, New York, NY 10027 USA; 7.Univ Adelaide, Sch Civil Environm & Min Engn, Adelaide, SA 5005, Australia |
推荐引用方式 GB/T 7714 | Moron, Sara,Amos, Kathryn,Edmonds, Douglas A.,et al. Avulsion triggering by El Nino-Southern Oscillation and tectonic forcing: The case of the tropical Magdalena River, Colombia[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Moron, Sara,Amos, Kathryn,Edmonds, Douglas A.,Payenberg, Tobias,Sun, Xun,&Thyer, Mark.(2017).Avulsion triggering by El Nino-Southern Oscillation and tectonic forcing: The case of the tropical Magdalena River, Colombia.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Moron, Sara,et al."Avulsion triggering by El Nino-Southern Oscillation and tectonic forcing: The case of the tropical Magdalena River, Colombia".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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