基于灰色关联度分析宝鸡市地下水水化学特征

Grey correlation analysis of hydrochemistry characteristics of groundwater in Baoji City

目的研究宝鸡市地下水水化学指标间的内在关联度,揭示地下水水化学的基本特征。方法按照《地下水环境监测技术规范》采集地下水水样,室内测定各水化学指标,运用灰色关联度理论分析宝鸡市地下水水化学特征。结果 1)宝鸡市地下水总硬度与Ca2+的关联度优于Mg2+,引起本区地下水的总硬度变化的主要因素是Ca2+,属钙硬型地下水类;2)总碱度与HCO3-的关联度非常密切,相关系数达0.968(P<0.01);3)地下水矿化度与主要离子的关联度按HCO3-,Ca2+,K++Na+,Mg2+,SO24-,Cl-依次减小。结论宝鸡市地下水水化学指标间存在一定的关联度。

Aim To study the intrinsic correlation among the different hydrochemistry indexes of groundwater in Baoji City and to reveal the basic hydrochemistry characteristics of groundwater.Methods The groundwater samples were collected on the basis of the provisions of Technical Specifications for Environmental Monitoring of Groundwater,then the hydrochemistry indexes of the samples were measured by indoor experiment and their hydrochemistry characteristics were analyzed with grey correlation theory.Results 1） The correlation between total hardness and Ca2＋ of groundwater in Baoji was higher than that between total hardness and Mg2＋,and Ca2＋ is the main factor which influences the total hardness of local groundwater that belongs to calcium hardness type;2） There is a higher correlation between total alkalinity and HCO-3,and the correlation coefficient was 0.968（P0.01）;3） The correlation coefficient between mineralization and some main ions decreased in the order of HCO-3 Ca2＋ K＋＋Na＋ Mg2＋ SO2-4 Cl-.Conclusion The result showed that there was correlation among the indexes of groundwater hydrochemistry in Baoji City.