Analysis Of Hydrochemical Characteristics Of Groundwater In Feicheng City

Feicheng City,as an important industrial area of Taian City,in recent years,the total amount of industrial and agricultural water consumption is increasing,there are excessive groundwater exploitation,water environment deterioration and other environmental hydrogeological problems.Based on the analysis of the long-term measured data of groundwater,this paper discusses the dynamic characteristics,spatial distribution and evolution of groundwater chemistry in Feicheng City.This paper combined with the hydrogeological conditions and groundwater historical data of the study area,using the methods of groundwater quality assessment,hydrogeology and hydrogeochemistry,and the water chemistry characteristics and temporal and spatial distribution of the study area,Water chemistry formation mechanism and hydrogeochemical process,carried out research,formed a phased results,draw the following conclusions:?1?The groundwater information management system of Feicheng is established based on Hydro GeoAnalyst,which can realize the storage,management,maintenance,query,analysis and visualization of groundwater data in a large amount of data collected in the past 30 years.This system provided the data and technical support for the study of the chemical characteristics of groundwater,and is the basis for the effective management of groundwater resources in Feicheng City in the future.?2?The indexes of pH,Cl^-,SO₄^2-,TDS,total hardness,NO₃^-,permanganate index and Fwere selected,and the groundwater quality was evaluated by F-score method.The poor water quality of groundwater is mainly distributed in the Shiheng township which is the main industrial park in the northwest of the study area and the runoff discharge area Wangzhuang township.The groundwater quality in the southern Wenyang plain is better.?3?The chemical type of groundwater in the study area The water chemistry type in 1996 was mainly HCO₃^-Ca type and HCO₃^-Ca·Mg type,and the chemical composition of water changed continuously,and the SO₄^2-and Cl^-ratio in groundwater increased continuously In 2015,the main water chemistry type has been changed to HCO3·SO4-Ca·Mg type,accounting for 64.29%,which also contains HCO3·SO4·Cl^-Ca·Mg type and HCO3·Cl^-Ca·Mg type water,The main anions shifted from HCO₃^-to SO₄^2-and Cl^-ions,and the TDS and total hardness showed a significant increase.?4?The main ion composition of groundwater hydrochemistry in the study area is consistent with the traditional distribution of groundwater solute content from the runoff area to the excrement area,and the salinity is roughly.Northeastern part of the study area to the southwest of the study area and the groundwater runoff discharge area gradually increased.But it is noteworthy that the northern city of Feicheng is actually a groundwater recharge area,but also occurred in a number of ion concentration is too high,the region is mainly Feicheng industrial area and coal mining area,indicating the intensity of human activities on the groundwater chemical composition.This impact is increasing.?5?The main hydrogeochemical processes of groundwater in Feicheng are analyzed by means of Gibbs diagram and ion scale ratio by hydrogeology,hydrogeochemistry and mathematical statistics.The results show that dissolution of calcite,dolomite and gypsum is the main influencing factor of the change of chemical composition of groundwater in the study area,and there is still a small amount of salt rock dissolution.There is also the effect of cationic alternating adsorption and dissolution to reduce Na+ and K+ ions in groundwater,and Ca2+ and Mg2+.The Human activities cause changes in aquifer structure and industrial and agricultural production wastewater and municipal sewage is also an important factor in the change of groundwater composition.