DOI: 10.5194/hess-19-1353-2015
Scopus记录号: 2-s2.0-84924589109
论文题名: Confronting the vicinity of the surface water and sea shore in a shallow glaciogenic aquifer in southern Finland
作者: Luoma S ; , Okkonen J ; , Korkka-Niemi K ; , Hendriksson N ; , Backman B
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 3 起始页码: 1353
结束页码: 1370
语种: 英语
Scopus关键词: Alkalinity
; Aquifers
; Cluster analysis
; Data handling
; Data integration
; Geochemistry
; Geology
; Groundwater
; Groundwater flow
; Groundwater pollution
; Groundwater resources
; Hierarchical systems
; Hydrochemistry
; Information management
; Isotopes
; Lakes
; Manganese
; Multivariant analysis
; Principal component analysis
; Recharging (underground waters)
; Salt water intrusion
; Seawater
; Surface waters
; Water management
; Water quality
; Anthropogenic sources
; Ground water recharge
; Groundwater flow systems
; Groundwater management
; Hierarchical cluster analysis
; Hydrogeochemical data
; Multivariate statistical approaches
; Temporal and spatial variation
; Groundwater geochemistry
; coastal aquifer
; glaciology
; groundwater flow
; human activity
; hydrogeochemistry
; recharge
; risk assessment
; surface water
; vulnerability
; water chemistry
; water quality
; Finland
; Santala
英文摘要: The groundwater in a shallow, unconfined, low-lying coastal aquifer in Santala, southern Finland, was chemically characterised by integrating multivariate statistical approaches, principal component analysis (PCA) and hierarchical cluster analysis (HCA), based on the stable isotopes δ2H and δ18O, hydrogeochemistry and field monitoring data. PCA and HCA yielded similar results and classified groundwater samples into six distinct groups that revealed the factors controlling temporal and spatial variations in the groundwater geochemistry, such as the geology, anthropogenic sources from human activities, climate and surface water. High temporal variation in groundwater chemistry directly corresponded to precipitation. With an increase in precipitation, KMnO4 consumption, EC, alkalinity and Ca concentrations also increased in most wells, while Fe, Al, Mn and SO4 were occasionally increased during spring after the snowmelt under specific geological conditions. The continued increase in NO3 and metal concentrations in groundwater indicates the potential contamination risk to the aquifer. Stable isotopes of δ18O and δ2H indicate groundwater recharge directly from meteoric water, with an insignificant contribution from lake water, and no seawater intrusion into the aquifer. Groundwater geochemistry suggests that local seawater intrusion is temporarily able to take place in the sulfate reduction zone along the freshwater and seawater mixed zone in the low-lying coastal area, but the contribution of seawater was found to be very low. The influence of lake water could be observed from higher levels of KMnO4 consumption in wells near the lake. The integration of PCA and HCA with conventional classification of groundwater types, as well as with the hydrogeochemical data, provided useful tools to identify the vulnerable groundwater areas representing the impacts of both natural and human activities on water quality and the understanding of complex groundwater flow system for the aquifer vulnerability assessment and groundwater management in the future. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78575
Appears in Collections: 气候变化事实与影响
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作者单位: Geological Survey of Finland, P.O. Box 96, Espoo, Finland; Geological Survey of Finland, P.O. Box 97, Kokkola, Finland; Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, Helsinki, Finland
Recommended Citation:
Luoma S,, Okkonen J,, Korkka-Niemi K,et al. Confronting the vicinity of the surface water and sea shore in a shallow glaciogenic aquifer in southern Finland[J]. Hydrology and Earth System Sciences,2015-01-01,19(3)