| 河南省永城市浅层地下水化学特征及形成机制 |
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| 引用本文： | 王攀,靳孟贵,路东臣.河南省永城市浅层地下水化学特征及形成机制[J].地球科学,2020,45(6):2232-2244. |
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| 作者姓名： | 王攀 靳孟贵 路东臣 |
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| 作者单位： | 1.中国地质大学环境学院, 湖北武汉 430074 |
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| 基金项目： | 河南省国土资源厅2016年度基础性地质环境调查项目No.2015-2077-8 |
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| 摘 要： | 地下水是河南省永城市重要的供水水源，浅层地下水水质污染严重制约了该市经济发展和居民生活质量的提高.在实地调查采样分析的基础上，运用水化学图解法、数理统计法、地球化学模拟法等方法综合分析了永城市浅层地下水的水化学特征和形成机制，探讨了该市浅层地下水污染来源和主要影响因素.结果表明:随含水介质和人类活动影响强度的变化，浅层地下水中K+、Ca2+、NO3-、Cl-、SO42-的浓度和COD（chemical oxygen demand）随深度增加而减少，而Na+、F-、Mg2+、HCO3-的浓度和TDS（total dissolved solids）随深度增加而上升.在煤矿区及煤化工区浅层地下水中SO42-浓度大于250 mg/L，远远高于其他区域的SO42-浓度，而在农业区浅层地下水中NO3-浓度大于30 mg/L，远远高于其他区域的NO3-浓度.综合分析表明:煤矿及其化工业废水和生活污水排放、过量使用化肥农药是永城市浅层地下水污染的主要因素.
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| 关 键 词： | 煤矿城市 浅层地下水 数理统计 地球化学模拟 形成机制 地下水 水文地质 |
| 收稿时间： | 2019-06-18 |
Hydrogeochemistry Characteristics and Formation Mechanismof Shallow Groundwater in Yongcheng City,Henan Province |
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| Abstract: | Groundwater is one of the most important water supply resources in Yongcheng City, but the pollution of shallow groundwater seriously restricts the economic development and the improvement of living standards in the city. On the basis of groundwater investigation and sampling, hydrogeochemical diagram method and multivariate statistics method and geochemical simulation method were comprehensively used to analyze the hydrochemical characteristics and formation mechanism, as well as the pollution source and the main affecting factors. With the change of aquifer medium and the intensity of human activities, the concentrations of K+, Ca2+, NO3-, Cl-, SO42- and COD (chemical oxygen demand) gradually decreased, while the concentrations of Na+, F-, Mg2+, HCO3- and TDS (total dissolved solids) gradually increased with the increase of depth, the former comes from human activities, while the latter comes from the original sedimentary environment. The concentration of SO42- in the areas of coal mine and coal chemical industry is higher than 250 mg/L, which is much higher than that in other regions. The concentration of NO3- is higher than 30 mg/L in agricultural areas. Integrated analyses implies that wastewater discharge of coal mine and chemical industry, leakage of household waste leachate and discharge of sewage, excessive application of pesticides and fertilizers are the main factors affecting the water quality of shallow groundwater. |
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