Groundwater Salinization and Flushing During Glacial-Interglacial Cycles: Insights From Aquitard Porewater Tracer Profiles in the North China Plain

doi:10.1029/2020WR027879

	Groundwater Salinization and Flushing During Glacial-Interglacial Cycles: Insights From Aquitard Porewater Tracer Profiles in the North China Plain
	Han, Dongmei 2,3; Cao, Guoliang 4; Currell, Matthew J.1; Priestley, Stacey C.5,6; Love, Andrew J.5
刊名	WATER RESOURCES RESEARCH
	2020-11-01
卷号	56 期号:11 页码:23
ISSN号	0043-1397
DOI	10.1029/2020WR027879
通讯作者	Han, Dongmei(handm@igsnrr.ac.cn)
英文摘要	Using natural tracer profiles to study migration of porewater salinity can help determine fluid fluxes and the timescales of salinization and freshening in coastal regions. Saline groundwater associated with evaporation and transgression events is widely distributed in the North China Plain (NCP). However, the fluid flux, time scales, and importance of different salinization processes are poorly constrained, particularly in areas beyond the limit of marine influence. Chloride (Cl) and delta O-18 profiles were obtained from two boreholes: one drilled at the edge of the piedmont alluvial fan (HS borehole) and one in the coastal region (G1 borehole). Numerical simulation of Cl and delta O-18 profiles confirmed diffusion-dominated solute transport but also indicated slow upward advective flow over geological timescales. The profile modeling at HS indicated that salinization related to evaporation has occurred since the Late Pleistocene. Assessment of alternative conceptual models indicates that intensive groundwater pumping in recent decades has also caused significant downward movement of saline porewater (e.g., movement of brackish water at similar to 0.6 m/yr), mixing modern or Holocene water with Pleistocene water. The coastal Cl profile modeling in contrast shows that porewater salinity can be primarily attributed to salt diffusion during four transgression/regression cycles since the late Middle Pleistocene. The Cl transport appears never to have reached an equilibrium state during the glacial-interglacial cycles. This suggests not only that trapped Holocene seawater is still present and leaching into adjacent sediments but also that Pleistocene water has never been entirely flushed from the deep part of the coastal sediments.
资助项目	National Natural Science Foundation of China[41371057] ; National Key R&D Program of China[2018YFE0196000] ; Outstanding member program of the Youth Innovation Promotion Association, CAS[2012040]
WOS关键词	ATLANTIC CONTINENTAL-SHELF ; GREAT ARTESIAN BASIN ; ISOTOPIC COMPOSITION ; SALTWATER INTRUSION ; SEAWATER INTRUSION ; REGIONAL AQUIFER ; SOLUTE TRANSPORT ; CONFINED AQUIFER ; STABLE-ISOTOPE ; RIVER DELTA
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000595832300036
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; Outstanding member program of the Youth Innovation Promotion Association, CAS
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/156421]
专题	中国科学院地理科学与资源研究所
通讯作者	Han, Dongmei
作者单位	1.RMIT Univ, Sch Engn, Melbourne, Vic, Australia 2.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.China Univ Geosci, Sch Water Resources & Environm, Beijing, Peoples R China 5.Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA, Australia 6.Univ Adelaide, Dept Earth Sci, Adelaide, SA, Australia
推荐引用方式 GB/T 7714	Han, Dongmei,Cao, Guoliang,Currell, Matthew J.,et al. Groundwater Salinization and Flushing During Glacial-Interglacial Cycles: Insights From Aquitard Porewater Tracer Profiles in the North China Plain[J]. WATER RESOURCES RESEARCH,2020,56(11):23.
APA	Han, Dongmei,Cao, Guoliang,Currell, Matthew J.,Priestley, Stacey C.,&Love, Andrew J..(2020).Groundwater Salinization and Flushing During Glacial-Interglacial Cycles: Insights From Aquitard Porewater Tracer Profiles in the North China Plain.WATER RESOURCES RESEARCH,56(11),23.
MLA	Han, Dongmei,et al."Groundwater Salinization and Flushing During Glacial-Interglacial Cycles: Insights From Aquitard Porewater Tracer Profiles in the North China Plain".WATER RESOURCES RESEARCH 56.11(2020):23.