| 于开宁.兰州市地下水化学特征及演化模拟[J].地质与勘探,2022,58(4):895-904 |
| 兰州市地下水化学特征及演化模拟 |
| Hydrochemical characteristics and evolution simulation of groundwater in Lanzhou City |
| 投稿时间：2019-12-05 修订日期：2022-02-23 |
| DOI：10.12134/j.dzykt.2022.04.018 |
| 中文关键词: 地下水 水化学特征 反向模拟 兰州市 |
| 英文关键词: groundwater, hydrochemical characteristics, inverse simulation, Lanzhou City |
| 基金项目:国土资源大调查项目（编号：DD20190331）、2021年度河北省引进国外智力项目（项目名称：地下水超采对地下水水质的影响及机理研究编号：2021-1）和河北地质大学科技创新团队项目（编号：KJCXTD-2021-14）联合资助 |
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| 中文摘要: |
| 为探究兰州市浅层地下水水质演化过程，通过对兰州市浅层地下水所取的40组水样进行分析测试，运用描述性统计、相关性分析、Piper三线图、Gibbs模型、离子比例系数方法对该区地下水特征进行分析，并运用PHREEQC软件反向模拟地下水演化规律。结果表明：兰州市地下水pH平均值为7.59，地下水呈弱碱性，地下水TDS值相对较高，其平均值为2353.21 mg/L ；SO42-和Na+分别是研究区地下水中优势阴、阳离子；SO4·Cl-Na·Mg和SO4·HCO3-Na·Ca型为主要地下水化学类型。研究区地下水化学组分主要受蒸发-浓缩作用影响；在两路径模拟中，均为方解石发生溶解，Na+将Ca2+发生阳离子交替吸附作用，白云石、岩盐、石膏均发生沉淀。 |
| 英文摘要: |
| In order to explore the evolution process of shallow groundwater quality in Lanzhou City, this work tested 40 groups of water samples from shallow groundwater in Lanzhou, and discussed the groundwater characteristics by using descriptive statistics, correlation analysis, Piper three-line diagram, Gibbs model and ion proportion coefficient. The PHREEQC software was then utilized to analyze the evolution law of groundwater by inverse simulation. Results show that the average pH value of groundwater in Lanzhou is 7.59, which is weakly alkaline. The TDS value of groundwater is relatively high, with an average value of 2353.21mg/L; SO42-and Na+ are the dominant anions and cations in the groundwater, respectively; and SO4·Cl-Na·Mg and SO4·HCO3-Na·Ca are the main chemical types of groundwater. The chemical composition of groundwater in the study area was mainly affected by evaporation concentration. In the two-path simulation, calcite dissolved, Na+ adsorbed Ca2+ alternately, and dolomite, rock salt and gypsum precipitated. |
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