干旱区生态环境知识资源中心(Arid): Tributary-junction alluvial fan response to an ENSO rainfall event in the El Huasco watershed, northern Chile

Arid

DOI	10.1177/0309133319898994
	Tributary-junction alluvial fan response to an ENSO rainfall event in the El Huasco watershed, northern Chile
	Cabre, Albert 1; Aguilar, German 2; Mather, Anne E.3; Fredes, Victor 4; Riquelme, Rodrigo 5
通讯作者	Cabre, Albert
来源期刊	PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT
ISSN	0309-1333
EISSN	1477-0296
出版年	2020
卷号	44 期号:5 页码:679-699
英文摘要	Tributary-junction alluvial fans situated at the intersection of confined valleys with <100 km(2) tributary catchments are of special interest to evaluate the heterogeneous consequences of extreme rainfall events in arid zones. These fans record the episodic sedimentological behaviour of the hillslope response to rainstorm events within tributary catchments, together with the influence on the main fluvial systems. In this paper, we benefit from the March 2015 event (23-26 March 2015), which produced 75-46 mm of precipitation over four days in the southern portion of the Atacama Desert. This storm event triggered several debris flows in El Huasco River watershed tributaries and, therefore, tributary-junction alluvial fans received a total of similar to 106 m(3) of sediments across 49 activated catchments. We find that the characteristic storm signature across the catchments can be synthetised in a conceptual fan formation model based on field mapping of facies (F1 to F6) present in the fans. The characteristic signature is a record of initially high sediment-to-water flows restricted to the fan environments (mainly debris flows) followed by later, more dilute (mainly hyper-concentrated to fluvial) flows that incise the tributary-junction alluvial fan deposits and link tributary catchments with the main river. These later-stage flood event deposits, locally, are capable of ponding and compartmentalising the main river where the longitudinal connectivity of the tributary-junction catchment is effective. This situation improves tributary-junction fan slope and main-trunk-channel linkages. This approach provides a reference framework for understanding the distribution and routing of effective runoff from similar rainfall events that control the aggradation and incision of the fluvial system, which is of great value when studying past stratigraphic arrangements in these arid alleys.
英文关键词	Tributary-junction alluvial fans debris flows Atacama Desert ENSO-related storms (dis)connectivity
类型	Article
语种	英语
国家	Chile ; England
收录类别	SCI-E
WOS记录号	WOS:000509185100001
WOS关键词	HOLOCENE ENVIRONMENTAL-CHANGES ; DEBRIS-FLOW ; SEDIMENT CONNECTIVITY ; ATACAMA DESERT ; HOWGILL-FELLS ; ANDEAN RANGES ; RIVER VALLEY ; MORPHOLOGY ; TERRACES ; DEPOSITS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2020-01-24
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312596
作者单位	1.Univ Catolica Norte, Dept Ciencias Geol, Ave Angamos 0610, Antofagasta, Chile; 2.Univ Chile, Adv Min Technol Ctr, Santiago, Chile; 3.Plymouth Univ, Plymouth, Devon, England; 4.Univ Chile, Santiago, Chile; 5.Univ Catolica Norte, Antofagasta, Chile
推荐引用方式 GB/T 7714	Cabre, Albert,Aguilar, German,Mather, Anne E.,et al. Tributary-junction alluvial fan response to an ENSO rainfall event in the El Huasco watershed, northern Chile[J],2020,44(5):679-699.
APA	Cabre, Albert,Aguilar, German,Mather, Anne E.,Fredes, Victor,&Riquelme, Rodrigo.(2020).Tributary-junction alluvial fan response to an ENSO rainfall event in the El Huasco watershed, northern Chile.PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT,44(5),679-699.
MLA	Cabre, Albert,et al."Tributary-junction alluvial fan response to an ENSO rainfall event in the El Huasco watershed, northern Chile".PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT 44.5(2020):679-699.