Hydrochemical characteristics and formation mechanism of shallow groundwater in Bozhou City, Anhui Province
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摘要: 安徽省亳州市浅层地下水是当地农业和生活用水的主要来源之一。为查明浅层地下水化学特征、解释其成因机理,文章综合运用描述性统计、相关性分析、离子比例系数和Piper三线图等方法,对143组浅层地下水样品进行分析和评价。研究结果表明亳州市浅层地下水化学类型复杂,主要阳离子含量依次为Na+>Mg2+>Ca2+,主要阴离子含量依次为HCO-3>SO2-4>Cl-;水化学特征主要受水岩相互作用、蒸发等因素影响,大气降水和人为因素总体影响相对较小;水岩相互作用中阳离子交换、硅酸盐和碳酸盐矿物风化溶解是主控因素;人为活动影响中,生活污染、农业活动大于工矿活动影响;地下水质量等级以Ⅳ类水为主,超Ⅲ类水主要影响因子为F-、Na+、总硬度和溶解性总固体(Total dissolved solids,TDS);灌溉水质量以中等为主,主要受Na+浓度过高影响。地下水化学成因机理研究为正在开展的淮河流域地下水资源调查评价和可持续开发利用提供了科学依据。Abstract: The present study is envisaged to investigate the chemical characteristics and formation mechanism of the shallow groundwater, one of the main sources for agricultural and domestic water in Bozhou City, Anhui Province. 143 samples of shallow groundwater were analyzed and evaluated by specifically using descriptive statistics, correlation analysis, ion ratio coefficient and Piper three-line diagram. The results reveal complicated chemical types of shallow groundwater in Bozhou City as follows: the contents of the cations and anions in the shallow groundwater are found to be in the order Na+> Mg2+> Ca2+ and HCO-3> SO2-4> Cl-, respectively. The hydrochemical characteristics are controlled by water-rock interaction, evaporation, and comparatively less influenced by the atmospheric precipitation and human factors. The exchange between the cations, weathering and dissolution of silicate and carbonate minerals dominate the water-rock interaction during the formation of shallow groundwater. In terms of human activity, the domestic pollution and agricultural activities are found to be more influential in hydrochemistry than industrial and mining activities. The ordinary grade of groundwater quality is IV. The key influencing factors in Ⅳ and Ⅴ grade water are F-, Na+, total hardness and total dissolved solids (TDS). The primary irrigation water is medium-quality, mainly affected by ultra-concentration of Na+. The research results on the mechanism of groundwater chemical genesis can lay a scientific basis for the investigation and evaluation of groundwater in the Huaihe River Basin and its sustainable exploitation and management.
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Key words:
- Bozhou City /
- shallow groundwater /
- hydrochemical characteristics /
- formation mechanism
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