| 黄土区洛川塬地下水化学特征及影响因素分析 |
| 摘要点击 2057 全文点击 713 投稿时间：2018-09-16 修订日期：2019-03-02 |
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| 中文关键词 洛川塬 地下水 水化学特征 溶质来源 控制因素 |
| 英文关键词 Luochuan loess tablelands groundwater hydro geochemical characteristics solutes source controlling factors |
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| 中文摘要 |
| 地下水是黄土塬区的主要水源，探讨其水化学特征及控制因素对于地下水资源合理利用和有效管理具有重要意义.以洛川塬为研究区域，通过该区2015~2017年采集的地下水的阴阳离子测定，运用Piper图、Gibbs图、相关性分析和正演模型等方法，对地下水的水化学特征及其控制因素进行了分析.结果表明：①地下水为弱碱性低矿化度水，水化学类型为Ca-Mg-HCO3型；②地下水的离子浓度特别是Na+、Ca2+和HCO3离子有时空变异，可能受降水淋溶土壤、阳离子交换和地下水的水平流动等因素影响.③影响地下水离子浓度的主要因素为碳酸岩和硅酸岩风化作用，其中碳酸盐岩风化平均贡献率介于47%~85%，硅酸盐岩风化的贡献率介于6%~38%.蒸发岩溶解、人类活动及大气输入的贡献非常小，平均贡献率均小于5%.可见，深厚的黄土为优质地下水的储存提供了良好的条件，目前水质仍然受自然因素主导. |
| 英文摘要 |
| Groundwater is of great importance to the loess area, and its hydrochemical characteristics and control factors are of great significance for the utilization and management of groundwater resources. In this study, groundwater hydrochemical characteristics and their controlling factors were analyzed using descriptive statistical analysis, Piper diagrams, Gibbs diagrams, forward derivation modeling, and correlation analysis. The results show that:① Groundwater is weakly alkaline, has low salinity, and has the water chemical type Ca-Mg-HCO3; the dominant anions and cations were HCO3- and Ca2+, which accounted for 58% to 59% of the anions and 40% to 80% of the cations, respectively; ② The ion content of the groundwater, particularly the dominant anions and cations, varied, which may have been affected by factors such as precipitation leaching of soil, cation exchange, and the horizontal flow of groundwater; ③ The main factors affecting the ion content of the groundwater are the weathering of carbonate and silicate rock, while the contribution of evaporite dissolution, human activity, and atmospheric input is very small. Carbonate weathering is a dominant source of ions in the groundwater, having an average contribution of 47%-85%, while the contribution of silicate rock weathering is between 6% and 38%. The dissolution of evaporite as a solute source was not important, contributing an average of 3%. Based on these results, it appears that the deep loess provides favorable conditions for the storage of high-quality groundwater, and the existing water quality is dominated by natural factors. |
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