大唐巩义电厂扩建工程对区域地下水环境影响研究  

Study on the impact of Datang Gongyi power plant expansion project on the regional groundwater environment

作　　者：赵翩翩 黄继超 刘建明 ZHAO Pian-pian;HUANG Ji-chao;LIU Jian-ming(Ecological and Environmental Geological Service Centre,Henan Geological Bureau,Zhengzhou,Henan 450053;Henan Institute of Geophysical and Spatial Information,Zhengzhou 450009,China)

机构地区：[1]河南省地质局生态环境地质服务中心,河南郑州450053 [2]河南省地球物理空间信息研究院,河南郑州450009

出　　处：《地下水》2024年第3期20-22,共3页Ground water

摘　　要：巩义市地处在嵩山北麓,属于黄土丘陵区,浅层地下水类型属黄土裂隙水,水位埋藏较深,地下水富水性差,属贫水区。本次以大唐巩义电厂扩建工程为例,通过工程建设过程中的水文地质调查成果,结合区域水文地质资料,查明工程所在区的地下水类型、富水性、水质状况及补给、径流、排泄条件,对工程建设对区域地下水环境的影响进行研究,结果表明:(1)研究区内浅层水埋藏在黄土裂隙中,含水层厚度在3~5 m,单井出水量一般小于100 m^(3)/d,属水量贫乏区,区内浅层黄土裂隙地下水划分为三种类型。其中,HCO_(3)-Ca·Mg型水,其水质较好;HCO_(3)·SO_(4)-Ca·Mg或HCO_(3)·SO_(4)-Ca·Na或HCO_(3)·SO_(4)-Na或HCO_(3)·SO_(4)-Ca·Na·Mg型水,主要分布于拟建场址区及其以西,水质较差;HCO_(3)·CI-Ca·Mg型水,水质较差。深层地下水埋藏于黄土裂隙浅层地下水之下,属中等富水区,地下水水化学类型为HCO_(3)-Ca·Mg或Ca·Na型水,水质优良。(2)工程建设对地下水产生污染的途径主要是污染物通过包气带下渗进入浅层地下水,造成浅层地下水及其与之有水力联系的深层地下水的污染。(3)从浅层地下水水文地质条件和地质环境分析成果看,研究区浅层水存在Fe^(3+)、Mn、F、CI^(-)、NH_(4)^(+)、NO_(3)-(N计)、NO_(2)^(-)(N计)超标现象,主要与含水层地质因素、农业化肥使用及生活废水排放等污染因素有关,建议在开采深层地下水时,采取封闭浅层地下水的止水措施,防止混合开采污染深层水,保护深层地下水水源。本次研究为合理保护区域地下水资源提供了科学依据。Gongyi City is located in the northern foothills of Songshan Mountain,which belongs to loess hilly area,the shallow groundwater type belongs to loess fissure water,the water level is buried deeper,the groundwater is poorly enriched,and it is a poor water area.This time,taking the Datang Gongyi power plant expansion project as an example,through the results of hydro-geological investigation in the process of engineering construction,combined with the regional hydro-geological data,to identify the type of groundwater,water richness,water quality conditions and conditions of recharge,runoff and discharge in the area where the project is located,and to conduct a study on the impacts of the construction of the project on the regional groundwater environment,and the results show that:(1)The shallow water in the study area is buried in the loess fissure,the thickness of the aquifer is 3~5 m,the water output of a single well is generally less than 100 m^(3)/d,which is a water-poor area,and the shallow loess fissure groundwater in the area is divided into three types.Among them,the HCO_(3)-Ca·Mg type of water,which has better water quality;HCO_(3)·SO_(4)-Ca·Mg or HCO_(3)·SO_(4)-Ca·Na or HCO_(3)·SO_(4)-Na or HCO_(3)·SO_(4)-Ca·Na·Mg type water,which is mainly located in the proposed site area and to the west of the site and is of poor quality,and HCO_(3)·CI-Ca·Mg type water,which is of poor quality.The deep groundwater is buried under the shallow groundwater in the loess fissure,which is a moderately water-rich area,and the hydro-chemical type of the groundwater is HCO_(3)-Ca·Mg or Ca·Na type of water,with excellent water quality.(2)The main way in which engineering construction pollutes groundwater is through the seepage of pollutants into shallow groundwater through the air-bearing zone,resulting in the pollution of shallow groundwater and the deep groundwater with which it is hydraulically connected.(3)From the results of hydro-geological conditions of shallow groundwater and geological environment analysis,

关 键 词：地下水 环境影响 污染 水质评价 大唐巩义电厂 

分 类 号：X143[环境科学与工程—环境科学]