【摘要】 本文选取2000—2023年间西安城区9个潜水观测井的216组水化学数据，运用图解法、Mann-Kendall趋势检验、Piper三线图、Gibbs图等方法，研究了西安城区潜水水化学演化特征及影响因素。结果表明：2000年以来，西安城区潜水总体循环条件良好，潜水水化学特征受到水—岩作用、降雨、水力梯度、人类活动等因素的共同影响。2000—2023年，除灞河、渭河等排泄区域，由于径流减缓及城市化建设、局地灌溉等人类活动的影响，造成水质中Cl^-、SO₄^2-、Mg²⁺离子含量略有增加，其余指标均呈现显著下降趋势；排泄区潜水水化学类型由HCO₃·SO₄、HCO₃·Cl型逐渐转变为HCO₃型为主局地HCO₃·Cl型；从西南至东北方向，研究区潜水TDS由大幅降低趋势逐渐变化为缓慢增加。潜水各化学组分整体上呈现出逐渐降低的演化趋势。研究结果可为西安市水资源优化配置及生态环境可持续发展提供依据。更多还原

【Abstract】 Based on the analysis of 216 phreatic water samples from 2000 to 2023, 9 in urban area of Xi’an, Graphic method, Mann-Kendall trend test, Pipper diagram and Gibbs model were used to study the phreatic water chemical characteristics and influencing factors in the urban area of Xi ’an.The results show that: Since2000, the overall circulation of phreatic water in Xi ’an has been good, which is influenced by water-rock interaction, rainfall, hydraulic gradient, human activities and other factors. From 2000 to 2023, in the discharge areas of the Ba River and Weihe River, the contents of Cl^-, SO₄^2- and Mg²⁺ in groundwater slightly increased due to runoff slowdown, urbanization, local irrigation and other human activities. The other indexes showed a significant downward trend; The hydrochemical type in the discharge area gradually changed from HCO₃·SO₄ and HCO₃·Cl type to HCO₃ types which in the dominant local type. From southwest to northeast, phreatic water TDS in the study area gradually changed from a large decrease trend to a slow increase. On the whole, the chemical components of phreatic water showed a gradually decreasing evolutionary trend. The results provide theoretical basis for optimal allocation of water resources and sustainable development of ecological environment in Xi ’an.更多还原