The Hydrochemical Characteristics and Evolution Process of Coal Reservoir Drainage Water in the Fukang Mining Area.

In 2016, the TDS concentration showed a trend of being higher in the south and lower in the northeast, with a relatively high average concentration; by 2021, the TDS concentration remained high around well TA23, but the rest of the concentrations were lower and evenly distributed.

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TDS, Na + , and HCO 3 – showed an initial increase followed by a leveling off, while Ca 2+ exhibited a decreasing trend followed by an increase and then another decrease, but the overall impact is small due to the relatively low numerical values.

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Vertically, in groundwater within 1000 m, TDS, Na + , Ca 2+ , Cl – , and HCO 3 – gradually increased with depth, while SO 4 2– and Mg 2+ showed an increasing trend followed by a decrease with depth.

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