Study on the impact of Datang Gongyi power plant expansion project on the regional groundwater environment
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 re-sults of hydro-geological investigation in the process of engineering construction,combined with the regional hydro-geolog-ical 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 m3/d,which is a water-poor area,and the shallow loess fissure groundwater in the area is divided into three types.Among them,the HCO3-Ca·Mg type of water,which has better water quality;HCO3·SO4-Ca·Mg or HCO3·SO4-Ca·Na or HCO3·SO4-Na or HCO3·SO4-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 HCO3·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 ground-water is HCO3-Ca·Mg or Ca·Na type of water,with excellent water quality.(2)The main way in which engineering con-struction pollutes groundwater is through the seepage of pollutants into shallow groundwater through the air-bearing zone,re-sulting 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,the shallow water in the study area has the phenomenon of exceeding the standard of Fe3+,Mn,F,CI-,NH4+,NO3-(N-meter),NO2-(N-meter),which is mainly related to the geological factors of the aquifer,the use of agricultural fertilizers and the discharge of domestic wastewater and other pollution factors,and it is recommended to take the water stop measures to close the shallow groundwater when exploiting the deep groundwater.It is recommended that when deep groundwater is extracted,measures should be taken to close the shallow groundwater,prevent mixed mining from polluting the deep water,and protect the source of deep groundwater.This study provides a scientific basis for the rational protection of regional groundwater resources.
underground waterenvironmental impactpollutionwater quality assessmentDatang Gongyi power plant
NETL
NSTL
万方数据
