Spatial-Temporal Evolutionof Karst River Pollution Characteristics and Water Quality Evaluation Under the Influence of Closed Pit Mine Water
The mine water flowing into the river will have a serious impact on the hydrological and ecological environment of the river.The study focused on karst geomorphic rivers polluted by closed pit mine water in Guiyang City and analyzed the pollution characteristics of rivers and evaluated their water quality.The outcomes show that the content of SO42-,Fe and other characteristic ions of closed pit mine water in the water body increases after the closed pit mine water flowing into the surface rivers of karst landscape.In addition to closed pit mine water,there are other sources of pollution in the study area,mainly local residents'domestic sewage or agricultural irrigation drainage.The calcula-tion results of Water Quality Index(WQI),Heavy Metal Pollution Index(HPI)and Heavy Metal Pollution Evaluation Index(HEI)show that the overall trend of all three is the same;the water quality grade at the river source is excellent,and the water quality becomes poor and worse after the recharge of the closed pit mine water,via surface water,after recharge from surface water,groundwater and self-purification of the river,the water quality grade becomes good.
closed pit mine waterwater quality evaluationmultivariate statistical analysiskarst river
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