灌区地下水作为生活饮用水的适宜性演变规律分析

Evolution Analysis of Groundwater Used as Domestic and Drinking Water in Irrigated Area

灌区地下水适宜性评价及适宜性演变过程分析对地下水合理开发利用具有重要的意义。基于人民胜利渠灌区1996—2016年地下水水化学数据,采用单因子法评价了地下水作为生活饮用水的适宜性,分析了评价结果的时空演变规律及影响该适宜性的因素。结果表明:研究区地下水水质超标范围明显扩大,水样中超标指标个数明显增加,说明该区地下水水质恶化趋势明显,总体呈现向越来越不适宜作为生活饮用水的方向发展;至2016年,研究区地下水水质超标区域呈条带状向两侧扩展至西南及东北边界,地下水不适宜作为生活饮用水的区域面积约占一半以上;研究区地下水水质超标区域的水样基本为多指标复合超标,而非单指标超标。

In order to make rational utilization of groundwater resources,it is very significant to analyze groundwater applicability and its hydrochemistry evolution process.Based on the groundwater hydrochemical data of the People′s Victory Canal Irrigation Area from 1996 to 2016,the applicability of groundwater used as domestic and drinking water was evaluated by single factor evaluation method,then,both the spatiotemporal characteristics and the influence factors of the applicability were analyzed.The results show that the area of polluted groundwater is increasing obviously,and the number of over-standard index becomes more,which indicate that groundwater quality is becoming worse and it is becoming more and more unsuitable for domestic and drinking water use.The over-standard area of groundwater extends to the southwest and northeast boundary of the study area by 2016,with the unsuitable area for groundwater as domestic and drinking water use up to half of the total study area.Among the groundwater samples,the reasons for exceed the quality standard are two or more indicators that exceed the standard value,not a single indicator.