干旱区生态环境知识资源中心(Arid): Submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary

Arid

DOI	10.1016/j.jhydrol.2019.124369
	Submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary
	Douglas, Audrey R.1; Murgulet, Dorina 1; Peterson, Richard N.2
通讯作者	Douglas, Audrey R. ; Murgulet, Dorina
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	580
英文摘要	Quantification of submarine groundwater discharge (SGD) remains a challenge due to its large spatial and temporal variability exacerbated by natural heterogeneity (e.g., climatic conditions and hydrogeologic settings) and anthropogenic disturbances (e.g., dredging, oil/gas extraction, and oil-field brine discharges). This study investigates the spatial and temporal variability of SGD during different hydroclimatic conditions in a semi-arid, anthropogenically disturbed estuary using Darcy's law (i.e., fresh/terrestrial SGD) and radon (Rn-222, total SGD) and radium (Ra-226, saline/recirculated SGD) isotope mass balances. Continuous electrical resistivity imaging and Rn-222 surveys revealed potential subsurface influences on SGD with the highest SGD rates in areas with sandier substrates and near transitions from low hydraulic conductivity to higher hydraulic conductivity bottom sediments. Darcy estimates ranged over two orders of magnitude and were slightly higher following the flooding recession (0.09-8.28 m.d(-1)) than following a period of low precipitation (-0.02-7.84 m.d(-1)). Mobile continuous Rn-222 estimates (0.79-1.81 m.d(-1)) support higher and more variable SGD rates, similar trends to those previously reported from time-series Rn-222 measurements (0.13-3.85 m.d(-1) across seasons). Radium-226 derived SGD (1.3 x 10(-2)-2.7 x(-2) m.d(-1 )using the average groundwater endmember) fall short of Rn-222-derived SGD due to inability to account for radium tracer reactivity within the sediment. However, local Darcy estimates agree well with the range of Rn-222, likely due to the steeper gradients near shore. Radium activity ratios and SGD rates reflect mixing of shallow and deep groundwater beneath the bay, likely due to anthropogenic disturbances with a greater influence from deep groundwater 3-6 months following major precipitation events. This study strongly suggests that semi-arid systems receive significant SGD, which in highly anthro-pogenically disturbed systems are derived from both shallower and deeper groundwater flowpaths and lag the climatic conditions by weeks (shallow inputs) and months or longer (deeper inputs).
英文关键词	Submarine groundwater discharge (SGD) Radium and radon Continuous resistivity profiles (CRPs) Oil-field brine discharge Oil and gas activity Nueces Bay, Texas
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000509620900060
WOS关键词	RADIUM ISOTOPES ; COASTAL WATERS ; TIME-SERIES ; RA ISOTOPES ; NUECES BAY ; RADON ; TEXAS ; RA-226 ; AQUIFER ; LAGOON
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314983
作者单位	1.Texas A&M Univ, Corpus Christi, TX 78412 USA; 2.Coastal Carolina Univ, Conway, SC 29528 USA
推荐引用方式 GB/T 7714	Douglas, Audrey R.,Murgulet, Dorina,Peterson, Richard N.. Submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary[J],2020,580.
APA	Douglas, Audrey R.,Murgulet, Dorina,&Peterson, Richard N..(2020).Submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary.JOURNAL OF HYDROLOGY,580.
MLA	Douglas, Audrey R.,et al."Submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary".JOURNAL OF HYDROLOGY 580(2020).