地下水化学类型分区的GIS空间分析模型

为了简化地下水化学类型分区的流程，客观地反映地下水化学类型的空间分布特征，基于GIS技术设计了地下水化学类型分区空间分析模型，利用K++Na+、Ca2+、Mg2+、HCO₃-、SO₄₂-、Cl-毫克当量百分数栅格数据，对阴阳离子进行组合排序编码，自动完成水化学类型的识别与空间分区，并使用ArcGIS的ModelBuilder实现了模型构建。以实际样本数据为例对该模型进行了验证，对地下水化学类型分区结果与传统方法进行了对比分析。结果表明，采用空间分析模型进行地下水化学类型分区的方法高效可行，水化学分区整体效果与传统方法基本一致，空间分析模型方法能够更好地反映地下水化学类型的空间演化特征。

GIS-Based Spatial Analysis Model for Regionalization of Groundwater Hydrochemical Type

This study is carried out to simplify the procedure of regionalization of groundwater hydrochemical type, and to objectively reflect spatial distribution characteristics of groundwater hydrochemical types. Based on the geographic information system (GIS) technology, the spatial analysis model for regionalization of groundwater hydrochemical type is designed and built by ArcGIS ModelBuilder. Using milligrams equivalent percent raster data of K++Na+、Ca2+、Mg2+、HCO₃-、SO₄2- and Cl-, the combinations and sequence of cations and anions are encoded, and the identification and spatial regiona-lization of groundwater hydrochemical type are automatically completed. The model is validated by measured sample data, and the results of the regionalization of groundwater hydrochemical types are compared with traditional methods. The result shows that the method is efficient and feasible by using spatial analysis model to identify and regionalize the groundwater hydrochemical type, and the overall effect of hydrochemical type regionalization is consistent with that of traditional methods, and the spatial analysis model can better reflect the spatial evolution characteristics of groundwater hydrochemical types.