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Article

Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

1
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3460; https://doi.org/10.3390/w12123460
Received: 21 October 2020 / Revised: 5 December 2020 / Accepted: 7 December 2020 / Published: 9 December 2020
(This article belongs to the Section Hydrology and Hydrogeology)
Groundwater in coastal aquifers is often affected by seawater intrusion, resulting in water quality deterioration. Using groundwater influenced by seawater intrusion for irrigation can lead to crop failure, erosion of machinery and pipes, and adverse effects on farming. In this study, the results of water testing, methods of statistical analysis, ion ratios, a Piper diagram, and a variety of groundwater irrigation suitability models were used to analyze the chemical composition of groundwater and the influence of seawater intrusion. The result shows that the content of Na+, K+, Ca2+, Mg2+, Cl, and SO42− in groundwater would increase due to seawater intrusion, and the increasing trend was consistent with the freshwater–seawater mixing line. With the deepening of seawater intrusion, the hydrochemical type gradually changes from Ca-HCO3·Cl to Na·Mg-Cl·SO4 and then to Na-Cl type, and the source of hydrochemical composition changes from “Rock Weathering Dominance” to “Evaporation Dominance”. When the Cl concentration is greater than 7.1 meq/L, groundwater will corrode pipelines and instruments; when greater than 28.2 meq/L, excessively high salinity of groundwater will have adverse effects on planting; and when greater than 14.1 meq/L, the groundwater hardness is too high, which may make the groundwater unsuitable for cultivation. View Full-Text
Keywords: seawater intrusion; groundwater; hydrochemistry; irrigation suitability; Laizhou Bay seawater intrusion; groundwater; hydrochemistry; irrigation suitability; Laizhou Bay
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MDPI and ACS Style

Wang, Z.; Wang, S.; Liu, W.; Su, Q.; Tong, H.; Xu, X.; Gao, Z.; Liu, J. Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion. Water 2020, 12, 3460. https://doi.org/10.3390/w12123460

AMA Style

Wang Z, Wang S, Liu W, Su Q, Tong H, Xu X, Gao Z, Liu J. Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion. Water. 2020; 12(12):3460. https://doi.org/10.3390/w12123460

Chicago/Turabian Style

Wang, Zhenyan; Wang, Shu; Liu, Wenyue; Su, Qiao; Tong, Hui; Xu, Xingyong; Gao, Zongjun; Liu, Jiutan. 2020. "Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion" Water 12, no. 12: 3460. https://doi.org/10.3390/w12123460

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