干旱区生态环境知识资源中心(Arid): Estimating groundwater recharge for a freshwater lens in an arid region: Formative and stability assessment

Arid

DOI	10.1002/hyp.13649
	Estimating groundwater recharge for a freshwater lens in an arid region: Formative and stability assessment
	Alrashidi, Mosaed S.1; Bailey, Ryan T.2
通讯作者	Alrashidi, Mosaed S.
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2020
卷号	34 期号:4 页码:1063-1080
英文摘要	The formation of subsurface freshwater lenses on top of brackish groundwater is a fascinating hydrologic phenomenon that creates groundwater supplies of great potential value in arid regions. Information on the recharge quantity and mechanism of these lenses is both scarce and uncertain. This study examines the formation and macroscale stability of the Rawdatain freshwater lens in Kuwait, for which significant pre-development data are available. The Rawdatain is a large (150 million m(3)) subsurface freshwater lens overlying brackish groundwater compared to the other freshwater lenses in the Arabian Peninsula. In this study, a three-dimensional (3D) density-dependent groundwater flow model is tested against the following data targets to estimate long-term diffuse and focused groundwater recharge: (i) groundwater head, (ii) total dissolved solids (TDS) groundwater concentration, (iii) volume and vertical thickness of stored groundwater of three different water quality TDS ranges (0-700, 700-1000 and 1000-2000 mg/L) and (iv) geometrical shape features of the lens along cross-sections. To better represent the spatial variation in TDS, six different recharge zones were assigned to allocate diffuse and focused recharge conditions. Twelve recharge rate scenarios, encompassing a wide range of feasible long-term average annual recharge values (200,000-5,000,000 m(3)/year), were tested against the multiple targets and compared with the groundwater age of the Rawdatain lens. Based on comparison with data targets, the long-term average annual recharge is estimated to be 500,000 m(3)/year. Scenarios of reduced recharge, which may occur due to changes in land-use or climate, demonstrate the extremely slow response of the lens, which is in agreement with the slow development and formation of the lens (>2,000 years). Within a 100-year time frame, a 50% reduction in annual recharge reduces the lens volumes by 21, 17 and 9% for the three water quality categories, respectively. This study demonstrates the stability of freshwater lenses in arid regions and also provides methodology for similar focused rainfall recharge freshwater lenses.
英文关键词	arid Arabian Peninsula freshwater lenses groundwater recharge multi-target calibration numerical modeling SEAWAT
类型	Article
语种	英语
国家	Kuwait ; USA
收录类别	SCI-E
WOS记录号	WOS:000503615800001
WOS关键词	CHLORIDE-MASS-BALANCE ; GRADIENT TRACER TEST ; ENVIRONMENTAL ISOTOPES ; NUMERICAL-SIMULATION ; SEAWATER-INTRUSION ; ALLUVIAL AQUIFER ; VIRUS TRANSPORT ; CAPE-COD ; RESOURCES ; FLOW
WOS类目	Water Resources
WOS研究方向	Water Resources
EI主题词	2019-12-20
来源机构	Colorado State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311866
作者单位	1.Kuwait Univ, Coll Engn & Petr, Dept Civil Engn, POB 5969, KW-13060 Safat, Kuwait; 2.Colorado State Univ, Dept Civil & Environm Engn, Ft Collins, CO 80523 USA
推荐引用方式 GB/T 7714	Alrashidi, Mosaed S.,Bailey, Ryan T.. Estimating groundwater recharge for a freshwater lens in an arid region: Formative and stability assessment[J]. Colorado State University,2020,34(4):1063-1080.
APA	Alrashidi, Mosaed S.,&Bailey, Ryan T..(2020).Estimating groundwater recharge for a freshwater lens in an arid region: Formative and stability assessment.HYDROLOGICAL PROCESSES,34(4),1063-1080.
MLA	Alrashidi, Mosaed S.,et al."Estimating groundwater recharge for a freshwater lens in an arid region: Formative and stability assessment".HYDROLOGICAL PROCESSES 34.4(2020):1063-1080.