干旱区生态环境知识资源中心(Arid): Recharge and residence times of groundwater in hyper arid areas: The confined aquifer of Calama, Loa River Basin, Atacama Desert, Chile

Arid

DOI	10.1016/j.scitotenv.2020.141847
	Recharge and residence times of groundwater in hyper arid areas: The confined aquifer of Calama, Loa River Basin, Atacama Desert, Chile
	Herrera, Christian; Godfrey, Linda; Urrutia, Javier; Custodio, Emilio; Jordan, Teresa; Jodar, Jorge; Delgado, Katherine; Barrenechea, Fabiola
通讯作者	Herrera, C
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	752
英文摘要	Groundwater recharge in hyper arid areas often depends on surface water infiltration and diffuse recharge of highly evaporated precipitation only contribute under favorable conditions. This happens in the Calama basin two-aquifer system, in the Central Andean area of northern Chile. A conceptual model of the groundwater system and its relationship with the Loa River is defined. We focus on the confined aquifer of the Calama basin, combining hydrodynamic, hydrogeochemical and isotopic methods. Radiocarbon (C-14) activity data of dissolved inorganic carbon (DIC), in conjunction with chemical data, are applied to evaluate groundwater residence time within the confined aquifer. The Loa River recharges the Calama basin aquifers in its northeastern part, with water that has chemical and isotopic characteristics inherited from the arid environment and volcanic rocks in its upper basin. In the central and northeastern part of the confined aquifer, minor variations in chloride concentration suggest that the deep aquifer is well confined. The delta O-18 and delta H-2 values in groundwater of the confined aquifer show an increasing isotopic fractionation from the recharge area (around -10 parts per thousand delta O-18) to those in the discharge area (between -8.5 parts per thousand and -8 parts per thousand) in the southwestern part of the aquifer. The C-14 activity continuously decreases down flow from the recharge by the Loa River. Adjusted DIC radiocarbon ages indicate a groundwater travel time between 1500 and 4000 years in the confined aquifer of Calama. Despite the limitations and uncertainties of radiocarbon in DIC to estimate groundwater transit times for the confined aquifer and considering complementary chemical and isotopic constraints, the DIC C-14 provides acceptable values. The approach may be applicable in other confined aquifers in hyper-arid climates in which the formation of aquifer systems linked to river damming by geological action took place. This information is needed for sound management of the scarce groundwater resources. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Recharge Arid zones Confined aquifer Groundwater C-14((DIC))
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000588243900057
WOS关键词	CHLORIDE MASS-BALANCE ; NORTHERN CHILE ; ISOTOPIC EVOLUTION ; PUMPING TESTS ; ARC ; PRECIPITATION ; STRATIGRAPHY ; PLEISTOCENE ; ALTIPLANO ; WATERS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327978
作者单位	[Herrera, Christian; Delgado, Katherine] Univ Bernardo OHiggins, Ctr Invest & Desarrollo Ecosistemas Hidr, Santiago, Chile; [Godfrey, Linda] Rutgers State Univ, Earth & Planetary Sci, 610 Taylor Rd, Piscataway, NJ 08854 USA; [Urrutia, Javier] Univ Antofagasta, Dept Min Engn 2030, HEUMA, Antofagasta, Chile; [Custodio, Emilio] Tech Univ Catalonia UPC, Dept Civil & Environm Engn, Groundwater Hydrol Grp, Barcelona, Spain; [Custodio, Emilio] Royal Acad Sci Spain, Barcelona, Spain; [Jordan, Teresa] Cornell Univ, Dept Earth & Atmospher Sci, Snee Hall, Ithaca, NY 14853 USA; [Jordan, Teresa] Cornell Univ, Atkinson Ctr Sustainable Future, Snee Hall, Ithaca, NY 14853 USA; [Jodar, Jorge] Geol & Min Inst Spain IGME, Zaragoza, Spain; [Barrenechea, Fabiola] Univ Bernardo OHiggins, Escuela Ciencias Tierra, Observatotio Gest Riesgo Desastres, Santiago, Chile
推荐引用方式 GB/T 7714	Herrera, Christian,Godfrey, Linda,Urrutia, Javier,et al. Recharge and residence times of groundwater in hyper arid areas: The confined aquifer of Calama, Loa River Basin, Atacama Desert, Chile[J],2021,752.
APA	Herrera, Christian.,Godfrey, Linda.,Urrutia, Javier.,Custodio, Emilio.,Jordan, Teresa.,...&Barrenechea, Fabiola.(2021).Recharge and residence times of groundwater in hyper arid areas: The confined aquifer of Calama, Loa River Basin, Atacama Desert, Chile.SCIENCE OF THE TOTAL ENVIRONMENT,752.
MLA	Herrera, Christian,et al."Recharge and residence times of groundwater in hyper arid areas: The confined aquifer of Calama, Loa River Basin, Atacama Desert, Chile".SCIENCE OF THE TOTAL ENVIRONMENT 752(2021).