Characteristics of groundwater quality in Changchun New Area and its evaluation on ecological health

This paper is the result of hydrogeological and environ mental survey engineering.

Objective In order to find out the characteristics and evolution of groundwater in Changchun new area and support the construction of northeast old industrial base.

Methods Based on the investigation and sampling, this paper makes full use of the previous achievements and data, and applies SPSS analysis software and groundwater pollution analysis software, through the analysis of the geological conditions, the spatial distribution characteristics of hydrochemical parameters, the chemical types of groundwater and the chemical causes of groundwater in Changchun new area, a series of results are obtained.

Results The groundwater in Changchun new area has high hardness and mineralization, HCO₃^- is dominant in the ions of groundwater, and the absolute mass concentration of Ca²⁺、Cl^-、O₄^2-、Na⁺ is relatively high; the mass concentration of pH, H₂SiO₃、Sr, TDS, Mg²⁺, HCO₃ is relatively stable; the ions of groundwater are mainly HCO₃^- and Ca²⁺; Na⁺ and K⁺ are from the dissolution of rock salt and siliceous rock; Ca²⁺ and Mg²⁺ are mainly from carbonate dissolution of salt.The quality of groundwater in the area can be divided into four grades, among which class V water is not evaluated.

Conclusions In general, class I water accounts for 7.50%, class II water 32.10%, class III water 20.80%, class IV water 39.60%. More than 60.4% of the groundwater is in good condition.