干旱区生态环境知识资源中心(Arid): Erosion after an extreme storm event in an arid fluvial system of the southern Atacama Desert: an assessment of the magnitude, return time, and conditioning factors of erosion and debris flow generation

Arid

DOI	10.5194/nhess-20-1247-2020
	Erosion after an extreme storm event in an arid fluvial system of the southern Atacama Desert: an assessment of the magnitude, return time, and conditioning factors of erosion and debris flow generation
	Aguilar, German; Cabre, Albert; Fredes, Victor; Villela, Bruno
通讯作者	Aguilar, G (corresponding author), Univ Chile, Fac Ciencias Fis & Matemat, Adv Min Technol Ctr, Ave Tupper 2007, Santiago, Chile.
来源期刊	NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
ISSN	1561-8633
EISSN	1684-9981
出版年	2020
卷号	20 期号:5 页码:1247-1265
英文摘要	The contribution of an individual extreme storm event to long-term erosion rates has been estimated for the first time in the Atacama Desert. A mean erosion of 1.3 mm has been calculated for the March 2015 event that impacted the southernmost part of the Atacama Desert. The estimated erosion is consistent with millennial erosion rates and the previously reported return times of high-sediment-discharge events in the study area. This is significant because erosion rates, related to events of high sediment discharge in arid fluvial systems, are difficult to measure with sediment loading due to destruction of gauges by devastating flash floods and therefore have not been directly measured yet. During the March 2015 storm, debris flows were reported as the main sediment transport process, while gullies and channels erosion were the main source of sediments that generated debris flows reaching the tributary junctions and the trunk valleys. Sediment yield at tributary outlets is highly dependent on the ability of catchments to store sediments in stream networks between storms. The largest tributary catchments, the high hydrological hierarchy, the low topographic gradient and the gentle slopes are the most determining factors in generating debris flows capable of reaching alluvial fans in any storm event from large sediment volumes stored in the stream networks. Our findings better assess the susceptibility to debris flow of arid catchments, which is significant for the south-ernmost valleys of the Atacama Desert because human settlements and industries are mostly established in alluvial fans.
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000629740200001
WOS关键词	CENTRAL CHILE ; LATE-HOLOCENE ; MARCH 2015 ; BE-10 CONCENTRATIONS ; CLIMATE VARIABILITY ; NORTHERN CHILE ; SEDIMENT ; ANDES ; RIVER ; PRECIPITATION
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349081
作者单位	[Aguilar, German; Cabre, Albert; Fredes, Victor; Villela, Bruno] Univ Chile, Fac Ciencias Fis & Matemat, Adv Min Technol Ctr, Ave Tupper 2007, Santiago, Chile; [Cabre, Albert] Univ Catolica Norte, Dept Ciencias Geol, Ave Angamos 0610, Antofagasta, Chile; [Fredes, Victor; Villela, Bruno] Univ Chile, Fac Ciencias Fis & Matemat, Dept Geol, Plaza Ercilla 803, Santiago, Chile; [Fredes, Victor] BGC Ingn Ltda, Apoquindo 3039, Santiago, Chile
推荐引用方式 GB/T 7714	Aguilar, German,Cabre, Albert,Fredes, Victor,et al. Erosion after an extreme storm event in an arid fluvial system of the southern Atacama Desert: an assessment of the magnitude, return time, and conditioning factors of erosion and debris flow generation[J],2020,20(5):1247-1265.
APA	Aguilar, German,Cabre, Albert,Fredes, Victor,&Villela, Bruno.(2020).Erosion after an extreme storm event in an arid fluvial system of the southern Atacama Desert: an assessment of the magnitude, return time, and conditioning factors of erosion and debris flow generation.NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,20(5),1247-1265.
MLA	Aguilar, German,et al."Erosion after an extreme storm event in an arid fluvial system of the southern Atacama Desert: an assessment of the magnitude, return time, and conditioning factors of erosion and debris flow generation".NATURAL HAZARDS AND EARTH SYSTEM SCIENCES 20.5(2020):1247-1265.