Using hydrochemical signatures to characterize the long-period evolution of groundwater information in the Dagu River Basin, China

Highlights

• The long-period groundwater evolution was identified by hydrochemical signatures.

• The dominant processes in the groundwater evolution were verified.

• Groundwater quality in the coastal areas was susceptible to deterioration due to SI.

• Groundwater contamination arose from fertilizer, livestock manure & domestic sewage.

Abstract

The evolution of hydrochemical compositions influenced by long-period interactions between groundwater and the geo-environment is a fundamental issue for exploring groundwater quality and vulnerability. This study systematically investigated the hydrochemical processes and anthropogenic interference occurring in the river basin by bivariate plots, Gibbs diagrams, saturation index, and the major ions ratios. Apparent changes in groundwater hydrochemistry have been observed in the study area, illustrating the origins of major ions are affected by various internal and external factors. Results highlighted that TDS varied from freshwater to brackish water, ranging between 187.90 and 2294.81 mg/L. Ca²⁺ and HCO₃⁻ are the dominant ions in the studied samples. The results gained by Gibbs diagrams, bivariate plots, saturation index, and the major ions ratios demonstrated that minerals dissolution/precipitation, cation exchange, and human inputs play crucial roles in the unconfined aquifers. Moreover, the overuse of nitrogen fertilizer, livestock manure, and industrial/domestic sewage led to nitrate and nitrite contamination and brought significant challenges to the surrounding hydrogeo-environment. The present study could make an unambiguous identification of natural processes and anthropogenic interventions influencing groundwater hydrochemistry’s long-period evolution and create a preliminary strategy for groundwater resources management.

Graphical abstract

Keywords

Groundwater quality / Hydrochemical signatures / Spatial-temporal variations / Water-rock interactions / Anthropogenic interventions

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Acknowledgements

This research is supported by the National Natural Science Foundation of China under Grant Nos. 41571214 and 41807010. The authors are also grateful to Prof. Zhaomao Liu of Qingdao Geo-Engineering Exploration Institute, China for his thoughtful and constructive comments.

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