DOI: 10.1002/grl.50478
论文题名: Quantifying the modern recharge of the "fossil" Sahara aquifers
作者: Gonçalvès J. ; Petersen J. ; Deschamps P. ; Hamelin B. ; Baba-Sy O.
刊名: Geophysical Research Letters
ISSN: 0094-8969
EISSN: 1944-8700
出版年: 2013
卷: 40, 期: 11 起始页码: 2673
结束页码: 2678
语种: 英语
英文关键词: Groundwater
; recharge
; semiarid
Scopus关键词: Grace terrestrial water storages
; Groundwater pumping
; Groundwater system
; Pie- zometric Head
; recharge
; Semi-arid environments
; semiarid
; Sustainable water
; Aquifers
; Groundwater
; Groundwater resources
; Hydrogeology
; Soil moisture
; Water conservation
; Recharging (underground waters)
; aquifer characterization
; GRACE
; piezometer
; recharge
; semiarid region
; water budget
; water economics
; water management
; Sahara
英文摘要: The North-Western Sahara Aquifer System (NWSAS), one of the world's largest groundwater systems, shows an overall piezometric decline associated with increasing withdrawals. Estimating the recharge rate in such a semiarid system is challenging but crucial for sustainable water development. In this paper, the recharge of the NWSAS is estimated using a regional water budget based on GRACE terrestrial water storage monthly records, soil moisture from the GLDAS (a land data system that assimilates hydrological information), and groundwater pumping rates. A cumulated natural recharge rate of 1.40 ± 0.90 km3 yr-1is estimated for the two main aquifers. Our results suggest a renewal rate of about 40% which partly contradicts the premise that recharge in this area should be very low or even null. Aquifer depletion inferred from our analysis is consistent with observed piezometric head decline in the two main aquifers in the region. Annual recharge variations were also estimated and vary between 0 and 4.40 km3 yr-1for the period 2003-2010. These values correspond to a recharge between 0 and 6.75 mm yr-1 on the 650,000 km2of outcropping areas of the aquifers, which is consistent with the expected weak and sporadic recharge in this semiarid environment. These variations are also in line with annual rainfall variation with a lag time of about 1 year. © 2013 American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879976840&doi=10.1002%2fgrl.50478&partnerID=40&md5=752420fb836bf559461508f671384c32
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6233
Appears in Collections: 气候减缓与适应
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作者单位: Aix-Marseille Univ., CEREGE, UMR 7330, Aix-en-Provence CEDEX 4, France
Recommended Citation:
Gonçalvès J.,Petersen J.,Deschamps P.,et al. Quantifying the modern recharge of the "fossil" Sahara aquifers[J]. Geophysical Research Letters,2013-01-01,40(11).