山东烟台大沽夹河流域中下游地区地下水水质演变特征研究

Research on evolution characteristics of groundwater quality in the middle and lower reaches of the Dagujia River in Yantai,Shangdong

本文以山东烟台大沽夹河中下游地区1987~2017年地下水水质监测数据为背景,选取对地下水影响较大的钠钾离子、钙离子、镁离子、重碳酸根离子、硫酸根离子、氯离子、硝酸根离子以及总硬度、矿化度作为研究对象,利用Grapher软件,制作地下水水质动态曲线图,分析地下水水质多年变化特征,并使用AquaChem软件绘制Piper三线图,总结地下水水质类型及其变化规律,对比分析研究区30年地下水质量变化情况,选择时间序列法对大沽夹河中下游地区地下水水质进去趋势预测,结果表明:研究区地下水主要离子浓度呈上升趋势,水化学类型由HCO3-Ca、HCO3·Cl-Ca·Na向HCO3·SO4-Ca·Na、HCO3·Cl·SO4-Ca·Na转变。但地下水质量变化不大。除下游沿海区域外,大部分地区尚未超过Ⅲ类水标准,仅部分地区NO3-超标明显。

This paper takes the groundwater quality monitoring data in the middle and lower reaches of Dagujia River in Yantai from 1987 to 2017 as the background.Sodium potassium ion,calcium ion,magnesium ion,bicarbonate ion,sulfate ion,chloride ion,nitrate ion and total hardness and salinity are selected as research objects.Grapher software is used to make dynamic graph of groundwater quality and analyze the characteristics of groundwater quality changes over the years.Using AquaChem software rendering Piper trilinear nomograph,summarizes the type of groundwater quality and its change rule.The variation of groundwater quality in the study area in 30 years Is compared and analyzed.Prediction of groundwater quality trend in the middle and lower reaches of Dagujia River by time series analysis.The results show that the main ion concentration of groundwater in the study area is on the rise.The type of water chemistry is changed from HCO3-Ca,HCO3·Cl-Ca·Na to HCO3·SO4-Ca·Na,HCO3·Cl·SO4-Ca·Na,but the quality of groundwater has not changed much.Except the downstream coastal area,most areas have not exceeded Class III water standards,only in some areas,NO-3 exceeds the standard.