气候变化领域集成服务门户(CCPortal): Litho-climatic influences on groundwater geochemistry in Sri Lanka

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DOI	10.1016/j.gsd.2024.101175
	Litho-climatic influences on groundwater geochemistry in Sri Lanka
	Senarathne, Sachintha; Barth, Johannes A. C.; van Geldern, R.; Chandrajith, Rohana
发表日期	2024
ISSN	2352-801X
起始页码	25
卷号	25
英文摘要	We present a preliminary investigation of geological, climatic and anthropogenic influences on groundwater geochemistry in Sri Lanka. This spatially confined island of about 65,000 km2 offers excellent boundary conditions for such an overview because it can be separated into two major geological and three climatic domains. Summary parameters, including electrical conductivity (EC) and total hardness (TH), were chosen as best proxies because they belong to the most frequently measured parameters of this data set. Groundwater quality data are presented from a total of 1318 groundwater samples. They were grouped into selected geo-climatic domains. Groundwater in the dry zone showed higher median EC and TH values (740 mu S cm- 1 and 199 mg L-1) when compared to the intermediate (400 mu S cm- 1 and 120 mg L-1) and wet zones (146 mu Scm-1 and 53 mg L-1). The sedimentary terrain of the county could be characterized by the highest median EC and TH values (1006 mu S cm- 1 and 261 mg L-1). In the metamorphic terrain that covers over 90% of the island, EC and TH values showed the strongest spatial variations that likely depend on climatic conditions. A correlation between EC and TH correlated with an r of +0.70. This trend suggests that EC can also serve as a robust indirect indicator of groundwater TH. Excessive evaporation, seawater intrusion and agricultural return flows affect groundwater quality, mostly in coastal regions, where freshwater demand increases. Sustainable groundwater management demands continuous and comprehensive monitoring of spatial and temporal fluctuations of groundwater. We also propose managed aquifer recharge to protect the long-term sustainability of groundwater in both sedimentary and metamorphic domains. This becomes particularly important under projected climate change scenarios in which drier regions in the country are expected to expand.
英文关键词	Groundwater geochemistry; Electrical conductivity; Total hardness; Geo-climatic regions; Climate change
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001231000000001
来源期刊	GROUNDWATER FOR SUSTAINABLE DEVELOPMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290288
作者单位	University of Erlangen Nuremberg; University of Peradeniya
推荐引用方式 GB/T 7714	Senarathne, Sachintha,Barth, Johannes A. C.,van Geldern, R.,et al. Litho-climatic influences on groundwater geochemistry in Sri Lanka[J],2024,25.
APA	Senarathne, Sachintha,Barth, Johannes A. C.,van Geldern, R.,&Chandrajith, Rohana.(2024).Litho-climatic influences on groundwater geochemistry in Sri Lanka.GROUNDWATER FOR SUSTAINABLE DEVELOPMENT,25.
MLA	Senarathne, Sachintha,et al."Litho-climatic influences on groundwater geochemistry in Sri Lanka".GROUNDWATER FOR SUSTAINABLE DEVELOPMENT 25(2024).