Hydrogeochemical evolution patterns of diverse water bodies in mining area driven by large-scale open-pit combined underground mining-taking Pingshuo Mining Area as an example.

Autor: Zhang W; The College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China; Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, China., Duan L; The College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China; Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Comprehensive Management of Water Resources and Water Environment in the Inner, Mongolia Section of the Yellow River Basin, Hohhot 010018, China. Electronic address: duanlimin820116@163.com., Yinglan A; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China., Xue B; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China., Wang G; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China., Liu T; The College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China; Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Comprehensive Management of Water Resources and Water Environment in the Inner, Mongolia Section of the Yellow River Basin, Hohhot 010018, China. Electronic address: txliu1966@163.com.
Jazyk: angličtina
Zdroj: Journal of contaminant hydrology [J Contam Hydrol] 2024 Nov; Vol. 267, pp. 104420. Date of Electronic Publication: 2024 Sep 02.
DOI: 10.1016/j.jconhyd.2024.104420
Abstrakt: Large-scale open-pit combined underground mining activities (OUM) not only reshape the original topography, geomorphology, and hydrogeochemical environment of the mining area, but also alter the regional water cycle conditions. However, due to the complexity arising from the coexistence of two coal mining technologies (open-pit and underground mining), the hydrological environmental effects remain unclear. Here, we selected the Pingshuo Mining Area in China, one of the most modernized open-pit combined underground mining regions, as the focus of our research. We comprehensively employed mathematical statistics, Piper diagram, Gibbs model, ion combination ratio, principal component analysis and other methods to compare the hydrochemistry and isotope data of different water bodies before (2006) and after (2021) large-scale mining. The changing patterns of hydrochemical characteristics of different water bodies and their main controlling factors in mining area driven by OUM were analyzed and identified, revealing the water circulation mechanism under the background of long-term coal mining. The results showed that: (1) The chemical composition of water has changed greatly due to large-scale coal mining. The hydrochemical types of Quaternary and Permian-Carboniferous aquifers shifted from predominantly HCO 3 -Ca·Mg before intensive mining to primarily HCO 3 ·SO 4 -Ca·Mg, HCO 3 -Na, HCO 3 ·SO 4 -Na·Mg, and HCO 3 ·SO 4 -Ca·Mg, HCO 3 -Ca·Na, HCO 3 ·SO 4 -Mg·Ca post-mining. Variations in the hydrochemical types of surface water were found to be complex and diverse. (2) Coal mining activities promote the dissolution of silicate rock and sodium-bearing evaporites, enhancing the strength and scale of positive alternating adsorption of cations. The oxidation of pyrite, dissolution of silicate weathering, and the leaching of coal gangue were identified as the main reasons for the significant increase of SO 4 2- , while decarbonation in confined aquifers led to a decrease in HCO 3 - . (3) Results from the principal component analysis and stable isotopes demonstrated the hydraulic connection among surface water, Quaternary aquifers, and Permian-Carboniferous aquifers induced by long-term OUM. The research findings provide a reference basis for the coordinated development of coal and water in the Pingshuo Mining Area and other open-pit combined underground mining areas.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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