聊城市地下水质量时空演变特征分析

为对聊城市地下水水质现状进行评价并分析其时空分布演变特征，选取 2018—2022 年地下水井监测数据，借助ArcGIS 处理软件，利用单指标评价法、综合水质标识指数法分别进行分析，结果表明：1） 单指标评价地下水质级别以Ⅳ类、Ⅴ 类为主，总硬度、锰、溶解性总固体(TDS)、钠、氯化物、硫酸盐、氟化物超Ⅲ类水贡献率是反映地下水质量状况的主要指标；2） 综合水质标识指数显示地下水质级别以Ⅲ类、Ⅳ类为主，Ⅴ 类占比较小，评价结果优于单指标评价法；3） 聊城市西部、西南部地下水质量较北部、东北部好，且整体地下水质状况呈现积极向好的变化趋势。

Analysis of the spatiotemporal evolution characteristics of groundwater quality in Liaocheng, North China

To evaluate the current status of groundwater quality in Liaocheng and analyze its spatiotemporal distribution and evolution characteristics, monitoring data from groundwater wells from 2018 to 2022 were selected. Utilizing ArcGIS processing software, the analysis was conducted using the single index evaluation method and the comprehensive water quality identification index method. The results are as follows: the evaluation of groundwater quality based on the single index method mainly falls into class IV and V. The major indicators reflecting the groundwater quality status are total hardness, manganese, total dissolved solids (TDS), sodium, chloride, sulfate, and fluoride, with the contribution rate of class III or higher. The comprehensive water quality identification index shows that groundwater quality is primarily classified as class III and IV, with a smaller proportion classified as class V. The evaluation results are better than those obtained from the single index evaluation method. The groundwater quality in the western and southwestern parts of Liaocheng is better than in the northern and northeastern parts, and overall, the groundwater quality shows a positive trend of improvement.