The chemical characteristics and hydrogen and oxygen isotopic compositions of the Zhonghu mining area in Huaibei
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ORIGINAL PAPER
The chemical characteristics and hydrogen and oxygen isotopic compositions of the Zhonghu mining area in Huaibei Houzhu Wang 1,2 & Qiang Wu 1 & Xing Chen 3 & Liugen Zheng 3 & Chunlu Jiang 3 Received: 28 September 2019 / Accepted: 12 August 2020 # Saudi Society for Geosciences 2020
Abstract To study the hydrochemical characteristics, influencing factors, and sources of the subsidence water, river water, and groundwater in the Zhonghu mining area in Huaibei. Piper diagrams, Gibbs distribution analysis, and linear regression are combined with hydrogen and oxygen isotope data. The results show that the relative proportions of the main cationic components in the study area are Na+ > Ca2+ > Mg2+ > K+ and that the relative proportions of the main anion components are HCO3− > SO42− > Cl−. The concentrations of total dissolved solids (TDS) in the surface water exhibit the following seasonal pattern: dry season > flatwater period > high-water period. Additionally, the shallow groundwater TDS concentrations exhibit the following seasonal pattern: flat-water period > high-water period > dry season. The Piper diagram and Gibbs distribution analysis suggest that the shallow groundwater hydrochemical type in the study area is HCO3− − Na+ and that the surface water hydrochemical type is HCO3− − SO42− − Na+. The magnitude of the overall fluctuation in δD and δ18O values in the samples exhibits the order of subsidence water > river water > shallow groundwater. From the analysis of deuterium excess values, the main recharge source of the river water, subsidence water, and shallow groundwater is atmospheric precipitation that has been affected by evaporation. The intensity of the impact is higher for subsidence water than for river water and groundwater, and the subsidence water is recharged not only by atmospheric precipitation but also by groundwater. Keywords Subsidence water . River water . Groundwater . Chemical characteristics of water . Hydrogen and oxygen isotope
Introduction Due to the increasing human demand for coal resources, coal mining activities have gradually intensified, and in coal mining areas, large-scale excavation has destroyed the original topography and rock structure (Svobodova et al. 2019; Kniesner and Leeth 2004). These changes lead to large areas of water in the mining area, alter the regional water exchange conditions and circulation processes, and accelerate the Responsible Editor: Broder J. Merkel * Liugen Zheng [email protected] 1
China University of Mining & Technology, Beijing 100083, China
2
China Coal Energy Co., Ltd., Beijing 100120, China
3
Present address: School of Resources and Environmental Engineering, Anhui Province Engineering Laboratory for Mine Ecological Remediation, Anhui University, 111 Jiulong Road, Hefei 230601, Anhui Province, China
connection between surface water and groundwater in the excavation area (Zhang et al. 2018). By analyzing the chemical composition and characteristics of ponded water in the subsidence area, the relationships among basin evapora
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