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Article

Hydrogeochemical Characterization and Its Seasonal Changes of Groundwater Based on Self-Organizing Maps

1
State Key Laboratory of Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2
School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Aldo Fiori
Water 2021, 13(21), 3065; https://doi.org/10.3390/w13213065
Received: 14 October 2021 / Revised: 27 October 2021 / Accepted: 30 October 2021 / Published: 2 November 2021
(This article belongs to the Section Hydrogeology)
Water resources are scarce in arid or semiarid areas; groundwater is an important water source to maintain residents’ lives and the social economy; and identifying the hydrogeochemical characteristics of groundwater and its seasonal changes is a prerequisite for sustainable use and protection of groundwater. This study takes the Hongjiannao Basin as an example, and the Piper diagram, the Gibbs diagram, the Gaillardet diagram, the Chlor-alkali index, the saturation index, and the ion ratio were used to analyze the hydrogeochemical characteristics of groundwater. Meanwhile, based on self-organizing maps (SOM), quantification error (QE), topological error (TE), and the K-means algorithm, groundwater chemical data analysis was carried out to explore its seasonal variability. The results show that (1) the formation of groundwater chemistry in the study area was controlled by water–rock interactions and cation exchange, and the hydrochemical facies were HCO3-Ca type, HCO3-Na type, and Cl-Na type. (2) Groundwater chemical composition was mainly controlled by silicate weathering and carbonate dissolution, and the dissolution of halite, gypsum, and fluorite dominated the contribution of ions, while most dolomite and calcite were in a precipitated state or were reactive minerals. (3) All groundwater samples in wet and dry seasons were divided into five clusters, and the hydrochemical facies of clusters 1, 2, and 3 were HCO3-Ca type; cluster 4 was HCO3-Na type; and cluster 5 was Cl-Na type. (4) Thirty samples changed in the same clusters, and the groundwater chemistry characteristics of nine samples showed obvious seasonal variability, while the seasonal changes of groundwater hydrogeochemical characteristics were not significant. View Full-Text
Keywords: self-organizing map; hydrogeochemistry; seasonal variation; cluster analysis; Hongjiannao self-organizing map; hydrogeochemistry; seasonal variation; cluster analysis; Hongjiannao
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MDPI and ACS Style

Wu, C.; Wu, X.; Lu, C.; Sun, Q.; He, X.; Yan, L.; Qin, T. Hydrogeochemical Characterization and Its Seasonal Changes of Groundwater Based on Self-Organizing Maps. Water 2021, 13, 3065. https://doi.org/10.3390/w13213065

AMA Style

Wu C, Wu X, Lu C, Sun Q, He X, Yan L, Qin T. Hydrogeochemical Characterization and Its Seasonal Changes of Groundwater Based on Self-Organizing Maps. Water. 2021; 13(21):3065. https://doi.org/10.3390/w13213065

Chicago/Turabian Style

Wu, Chu, Xiong Wu, Chuiyu Lu, Qingyan Sun, Xin He, Lingjia Yan, and Tao Qin. 2021. "Hydrogeochemical Characterization and Its Seasonal Changes of Groundwater Based on Self-Organizing Maps" Water 13, no. 21: 3065. https://doi.org/10.3390/w13213065

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