神东矿区矿井水灌溉适宜性空间分布特征OA北大核心CSTPCD

The Shendong mining area,located in Northwestern China,is characterized by a dry climate and scarce water resources.A large amount of mine water is used for ecological irrigation in this mining area.This study investigated the suitability of mine water for irrigation through on-site sampling and hydrochemical testing of mine water in the mining area.We analyzed the spatial distribution patterns of water quality parameters and hydrochemical types.This study also evaluated and predicted the suitabili-ty of long-term irrigation using sodium ion adsorption ratio(SAR),soluble sodium percentage(KNa),Kelly ratio(KR),permeability index(PI),residual sodium carbonate(RSC),magnesium adsorption ratio(KMg)single indicator methods,as well as USSL and Wilcox graphical methods.Taking into ac-count the groundwater level,we discussed soil texture types,climatic conditions of the mining area and the applicability of the evaluative indicators.The results show that the main ions in the mine water of Shendong mining area are sorted by mass concentration.The cations are Na+,Ca2+,Mg2+and K+,and the anions are HCO-3,SO2-4,Cl-and NO-3.The mine water is weakly alkaline as a whole,and the concen-trations of Cl-and NO-3 vary significantly with space.There was a significant positive correlation among Na+,Cl-,SO2-4,total dissolved solid(TDS),electric conductivity(γ),Ca2+and Mg2+,and a negative correlation between F-and Ca2+,Mg2+.The hydrochemical type of mine water in the mining area is pri-marily the NaHCO3 type.The chemical composition of mine water is mainly affected by ion exchange and evaporation.Na+,Cl-,SO2-4,Ca2+,Mg2+and F-in the mine water were abnormally enriched and the TDS and γ values exceeded the standard.The salt accumulation effect is not obvious under the com-bined influence of groundwater and surface water waterlogging in the mining area,and the soil compac-tion is not prominent.The PI method and the USSL graphic method are not suitable for evaluating irriga-tion water quality in this area.The evaluation results based on Wilcox graphical method show that the mine water of Halagou,Shigetai and Daliuta mines are suitable as irrigation water.The mine water from Bulianta,Shangwan,Buerta,Wulanmulun,and Huojitu mines should not be used for long-term direct ir-rigation.This study has theoretical and practical significance for the rational development and utilization of mine water resources in mining areas.