干旱区研究2024，Vol.41Issue(3)：411-420,10.DOI:10.13866/j.azr.2024.03.06
内蒙古伊敏盆地地下水水化学特征及其成因
Hydrochemical characteristics and genesis of groundwater in the Yimin Basin,Inner Mongolia
摘要
Abstract
Mining activities have strongly changed the characteristics of the regional hydrological cycle and have a significant impact on the chemical characteristics of groundwater.Revealing the evolutionary characteristics of the groundwater system under the influence of coal mine development can provide theoretical support for ecologi-cal environment protection and sustainable development in coal mine areas.In this paper,taking the Yimin Basin in Inner Mongolia as an example,based on hydrogeological investigation combined with the groundwater flow system theory,Piper three-line diagram,Gibbs diagram,ion proportional coefficient,mineral saturation index,and other analysis methods,the characteristics of groundwater chemical changes under the interference of coal mining activities were explored.Results indicate that the overall water environment in the study area is weakly al-kaline,and the significant influence and noninfluence zones exceed the detection indexes in different degrees.Coal mining in the basin has accelerated the rate of regional hydrological cycle,causing the water quality in the significant impact zone to evolve toward desalination.The development of open-pit coal mining has opened up the previously closed groundwater system,and a series of water-rock interactions stimulated by the oxidation of sulfur-containing coal and sulfurous iron ore and acid production primarily cause the changes in the chemical characteristics of the regional groundwater.The hydrochemistry of groundwater in the basin is affected by evapo-ration,concentration and water-rock interactions.Along the flow direction of groundwater,the hydrochemical type in the significantly affected area changes from HCO3-Ca·Na type to HCO3-Ca,and the concentrations of TDS and Cl-show a downward trend.In the nonaffected zone,the hydrochemical type changed from HCO3-Ca·Na to Cl-Ca·Mg,and the concentrations of TDS and Cl-showed an upward trend.关键词
地下水/水化学特征/人类活动影响/水-岩相互作用/伊敏盆地Key words
groundwater/hydrochemical characteristics/impact of human activities/water-rock interaction/Yimin Basin引用本文复制引用
王平顺,苗新岳,燕亚平,董生旺,董少刚..内蒙古伊敏盆地地下水水化学特征及其成因[J].干旱区研究,2024,41(3):411-420,10.基金项目
内蒙古自治区高等学校科学研究项目(NJZZ23089) （NJZZ23089）
国家自然科学基金项目(42267025) （42267025）
