毕节地区地下水水化学主成分空间分布特征研究

Spatial Distribution Research on Principal Components of Groundwater Hydrochemistry in Bijie

采用多元统计法分析贵州毕节地区地下水水样中Na+、K+、Ca2+、Mg2+、HCO3-、SO42-、Cl-等水化学成分的主成分,采用经验贝叶斯克里金插值法分析各主成分空间分布特征。分析结果可知:第一主成分包括Ca2+、Mg2+、K+、HCO3-等离子,成分的形成以溶滤作用为主,呈从西向东、补给区到排泄区逐渐增强趋势;第二主成分包括Na+、SO42-等离子,其来源与矿产资源分布、人类活动及地下水浓缩作用有关,其值西部高,东部低,呈从西向东减弱的趋势;第三主成分包括Cl-、K+等离子,空间分布表现为北中部比较高,其来源与人类活动污染有关,毕节地区地下水受人类活动影响轻微。

Principal component analysis method were used to analysis the principal component:Na+、K+、Ca2+、Mg2+、HCO3-and Cl-of the groundwater hydrochemistry in Bijie.Bayesian-Kriging interpolation algorithm method were used to analysis the spatial distribution characteristics.The first principal component include Ca2+、Mg2+、K+and HCO3-,the component mainly came from dissolution of carbonate rocks.The distributiontends to increase gradually from west to east and recharge zone to discharge zone.The second principle component includes Na+、SO42-,the main source of it is related to the distribution of mineral resources and human activities and groundwater concentration,its value is high in the west,low in the east,tend to weaken from west to east.The third principal component includesCl-、K+,its spatial distribution is relatively high in the North Midlands,and its source is related to the pollution of human activities.Groundwater hydrochemistry in Bijie is slightly affected by human activities.