Hydrochemical Characteristics And Water Quality Analysis And Evaluation Of Groundwater In Zhaozho

Zhaozhou is located in Heilongjiang Province,and the supply and demand of water resources is not optimistic,and it belongs to a more serious water shortage area.With the disorderly exploitation of groundwater in the area,the phenomenon of uneven development degree has appeared,which has further reduced the groundwater level,so the chemical characteristics of groundwater in the area are studied,and then grasp whether the groundwater quality in the area has deteriorated,so as to provide a scientific basis for the rational development of groundwater and ensuring the safety of drinking water supply.In this paper,with the assistance of a variety of analysis methods,the ion characteristics of groundwater are elaborated in detail,the quality of groundwater is analyzed from different angles,and the basic situation and existing problems of groundwater in this region are generally understood,helping people to have a clearer understanding of the groundwater environment in this region.It also provides reference for the follow-up research.Specific contents include:（1）Hydrogeological conditions such as water-bearing medium,type,filling and drainage mode of groundwater in the study area;（2）With the help of descriptive statistical analysis,correlation analysis,Gibbs chart analysis and Piper three-wire graphic method,the analysis of conventional hydrochemical indexes in submersible and confined groundwater is carried out to deeply analyze the hydrochemical characteristics of groundwater,to carry out in-depth exploration of the hydrochemical characteristics of water body,and to explore the relevant influencing factors;（3）Detection of groundwater chemical indexes and analysis of characteristics exceeding the standard,and the BP neural network analysis method was used to evaluate the groundwater quality of the diving aquifer and confined aquifer in the study area.The results showed that:（1）The p H value,DO,EC,T and other field test parameters were not abnormal.In the phreatic aquifer,the cation content can be arranged as Na⁺,Ca²⁺,K⁺and Mg²⁺in the order from large to small,while the anion content can be arranged as HCO₃^-,Cl^-,SO₄^2-and NO₃^-.In confined aquifers,the cations are Na⁺,Ca²⁺,Mg²⁺and K⁺in descending order,while the anions are HCO₃^-,Cl^-,SO₄^2-and NO₃^-in descending order.According to the piper three-plot diagram in the region,Na-HCO₃ type is the most widely distributed groundwater chemical type in the study area.（2）The chemical composition of water in the study area is largely due to the interaction between water and rock.The chemical composition of water in submersible and confined aquifer is formed by the interaction between water and rock and evaporation and concentration.（3）The total hardness index has the most prominent effect on water quality.Among all pollution indexes,the most important indexes include F^-,NO₃^-and NO₂^-.The water quality of the submersible aquifer in the study area is in a relatively good state.The water quality of confined aquifers is relatively poor.Most of the Class V water in the study area is located in the northwest and southwest regions.Poor primary hydrogeological environment and frequent human living and agricultural activities are also the main factors leading to poor water quality in this region.