贵安新区东部岩溶地下水水化学特征

为弄清贵安新区东部区域岩溶地下水水化学特征,根据研究区采取的50组和收集的68组水样的水化学测试结果,利用SPSS、ArcGIS、MapGIS、Origin等软件,对水质参数相关性及主要离子空间分布进行分析;采用舒卡列夫分类法、Piper三线图、Gibbs图、离子比值图等对研究区的水化学特征进行了分析。结果表明:①研究区Ca²⁺、HCO₃^-为优势离子,Na⁺、SO₄^2-、F^-、NO₃^-有强烈的空间变异性,溶解性固体总量(TDS)与各组分相关性较好;②地下水类型以HCO₃-Ca、HCO₃-Ca·Mg、HCO₃·SO₄-Ca型水为主,其中HCO₃-Ca·Mg型水占比最大为32.2%;③Mn、Fe、Al、NH₄⁺等超过地下水质量标准,主要分布在三叠系安顺组(T_1-2a)、大冶组(T₁d)含膏盐地层,Mn超标达8.47%;④地下水处于岩石风化控制区,含岩盐地层溶滤起主导作用且发生阳离子吸附作用,主要水岩作用为碳酸盐岩溶解,碳酸岩盐是Ca²⁺和HCO₃^-的主要来源。该研究为今后岩溶地下水资源的开发利用与保护提供依据。

Hydrochemical Characteristics of Karst Groundwater in the East of Gui'an,Guiyang

The aim of this study is to clarify the chemistry characteristics of karst groundwater in the eastern part of Gui'an new area of Guiyang, China. The correlation among water quality parameters and the spatial distribution of major ions were examined using SPSS, ArcGIS,MapGIS, and Origin based on the water chemistry test results of 50 groups of water samples and 68 sets of data in the study area. The groundwater chemistry characteristics of the study area were analyzed using the Shoka Lev's classification, Piper's plot, Gibbs plot, and ion ratio diagram. Results manifest that: 1) Ca²⁺ and HCO₃^- are dominant ions in the study area; Na⁺,SO₄^2-, F^-, and NO₃^- are of strong spatial variability, and TDS has a good correlation with each component.2) HCO₃-Ca,HCO₃-Ca·Mg,and HCO₃·SO₄-Ca are major groundwater types, of which HCO₃-Ca·Mg type accounts for 32.2%, the largest proportion. 3) The content of Mn, Fe, Al, and NH₄⁺ exceed groundwater quality standards and are mainly distributed in the Triassic Anshun Formation in the study area (T_1-2a), Daye Formation (T₁d) and other gypsum-salt-bearing formations, with Mn exceeding the standard by 8.47%. 4) Groundwater is in the rock-weathering control zone where the rock-salt-bearing formations are dominated by leaching and cation adsorption and the dissolution of Carbonate rock, which is the major source of Ca²⁺ and HCO₃^-, and the major reflection of water-rock interaction.