北京地区地下水环境背景值选取方案初步研究  

Preliminary Study on Selection Schemes of Groundwater Environmental Background Values in Beijing Area

作　　者：刘元章[1] 吴芮欣 王旭[1] 王树芳[1] 王丽亚[1] 崔一娇[1] 郭彬彬[1] 孙赵爽 杜璇 LIU Yuanzhang;WU Ruixin;WANG Xu;WANG Shufang;WANG Liya;CUI Yijiao;GUO Binbin;SUN Zhaoshuang;DU Xuan(Beijing Institute of Hydrogeology and Engineering Geology,Beijing 100195)

机构地区：[1]北京市水文地质工程地质大队

出　　处：《城市地质》2019年第4期10-16,共7页Urban Geology

基　　金：中国地质调查局地科院基本科研业务课题(JYYWF20182004);国家自然科学基金重点项目(41831283)联合资助

摘　　要：选择受人类活动影响较小的北京山区基岩水(包括泉水)和北京平原区隐伏基岩水进行取样测试,分析水质的影响因素及其分布演化规律。分析结果:一是地层岩性对水质起到一定的控制作用,不同岩性介质中的水质会有不同特点;二是运移时间长短的不同,会影响水质特点;三是人类活动对地下水的原始状况产生了较大的影响。故背景值的选取应尽量避开地层岩性、运移时间、人类活动的影响。基于上述认识,提出了本区地下水背景值选取的3种方案并进行了对比探讨,包括:(1)工业化之前的大气降水;(2)工业化之前的地下水;(3)当前水质最好的地下水。经综合分析研判,基于极限推理的方法,认为可参照工业化之前的大气降水水质浓度值作为地下水环境背景值,这在原理上更加符合背景值的含义,同时便于不同岩性区(包括第四系)统一对比,方便使用。通过资料收集,初步给出了一套可作为北京地区地下水环境背景值的主要离子浓度值,同时在有机指标方面也进行了分析探讨。This study takes Beijing as the study area,and the bedrock water(including spring water)in the mountainous area of Beijing and the hidden bedrock water in the plain area of Beijing were sampled and tested,and the influencing factors and distribution and evolution law of water quality were analyzed.The results are as follows:firstly,the lithology of strata plays a dominant role for the water quality,water in different rocks will have different characteristics;secondly,different migration time will affect water quality characteristics;thirdly,human activities have a greater impact on the original condition of groundwater.Therefore,when we select the background values,the above three effects including lithology,migration time,and human activities should be avoided as far as possible.Based on the above understandings,three selection schemes of groundwater background values in this area are proposed and compared, including: (1) Precipitation before industrialization;(2)Groundwater before industrialization;(3) Groundwater with the best water quality at present. Through comprehensive analysisand comparison, based on the method of limit reasoning, it is considered that the atmospheric precipitation water quality beforeindustrialization can be selected as the background value of groundwater quality, which is more in line with the meaning ofbackground values in principle, and is convenient for the unified comparison of different lithologic zones (including Quaternary)and easy to be used. Through data collection, a set of main ion concentration values that can be used as background values ofgroundwater environment in Beijing area are preliminarily proposed, also the organic indexes are analyzed and discussed.

关 键 词：地下水 环境背景值 山区基岩水 隐伏基岩水 北京地区 

分 类 号：P641[天文地球—地质矿产勘探]