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Hydrogeochemical characterization and quality assessment of groundwater using self-organizing maps in the Hangjinqi gasfield area,Ordos Basin,NW China

引用

Geoscience Frontiers 2021年第2期12卷 781-790页

作者： Chu Wu Chen Fang Xiong Wu Ge Zhu Yuzhe Zhang Department of Water Resources China Institute of Water Resources and Hydropower ResearchBeijing 100083China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China Center for Advanced Technology and Education(CATE) Florida International UniversityMiamiFL 33174USA

Water resources are scarce in arid or semiarid areas,which not only limits economic development,but also threatens the survival of *** local communities around the Hangjinqi gasfield depend on groundwater sources for water supply.A clear understanding of the groundwater hydrogeochemical characteristics and the groundwater quality and its seasonal cycle is invaluable and indispensable for groundwater protection and *** this study,self-organizing maps were used in combination with the quantization and topographic errors and K-means clustering method to investigate groundwater chemistry *** Piper and Gibbs diagrams and saturation index were systematically applied to investigate the hydrogeochemical characteristics of groundwater from both rainy and dry ***,the entropy-weighted theory was used to characterize groundwater quality and assess its seasonal variability and suitability for drinking *** hydrochemical groundwater dataset,consisting of 10 parameters measured during both dry and rainy seasons,was classified into 6 clusters,and the Piper diagram revealed three hydrochemical facies:Cl-Na type(clusters 1,2 and 3),mixed type(clusters 4 and 5),and HCO3-Ca type(cluster 6).The Gibbs diagram and saturation index suggested thatweathering of rock-forming mineralswere the primary process controlling groundwater chemical composition and validated the credibility and practicality of the clustering ***-thirds of 45 groundwater samples were categorized as excellent-or good-quality and were suitable as drinking *** changes within the same and different clusters from the dry season to the rainy season were detected in approximately 78%of the collected *** main factors affecting the groundwater quality were hydrogeochemical characteristics,and dry season groundwater quality was better than rainy season groundwater *** on this work,such results can be used to investigate the seasonal variation of hy

关键词： Self-organizing maps Seasonal change entropy-weighted theory Hydrogeochemical characteristics Groundwater quality

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