【摘要】 为了研究双辽市地下水化学特征及成因,采集了双辽市82个地下水潜水样品,检测分析了地下水主要组分。运用描述性统计分析、Piper三线图、相关性分析、离子相关关系、Gibbs图等方法对双辽市地下水化学特征及成因进行了分析,揭示了地下水水化学特征的变化规律。结果表明:双辽市地下水pH平均值为7.60,呈弱碱性,TDS均值837.75 mg/L,其中有55个水样为淡水,占总数的67.07%,其余为微咸水,沿地下水流方向,TDS逐渐增大;地下水中主要的阴阳离子为HCO₃^-、Ca²⁺;地下水水化学类型以HCO₃-Ca型为主,其次为HCO₃-Ca·Mg型;沿地下水水流方向,东辽河流域地下水化学类型主要从HCO₃-Ca型向HCO₃·SO₄-Ca型演化,西辽河流域地下水化学类型主要从HCO₃-Ca型向HCO₃-Ca·Mg型和HCO₃-Ca·Na型演化;在地下水补给区,水文地球化学作用以风化溶滤作用为主,在地下水径流—排泄区水文地球化学作用以蒸发浓缩作用和阳离子交换作用为主。更多还原

【Abstract】 To study the chemical characteristics and genesis of groundwater in Shuangliao City, 82 phreatic water samples are collected, and the main components of groundwater are detected and analyzed. Descriptive statistical analysis, Piper, correlation analysis, ion correlation method, Gibbs diagram are used to analyze the chemical characteristics and genesis of groundwater in Shuangliao City, revealing the variation law of groundwater hydrochemical characteristics. The result shows that the average pH of phreatic water is 7.60 in Shuangliao City, which is weakly alkaline. The average value of TDS is 837.75 mg/L. 55 phreatic water samples, 67.07% of the total are fresh water, while the remainder is brackish water. The TDS is gradually increasing along the direction of groundwater flow. HCO^-₃ and Ca²⁺ are major ions in groundwater. The groundwater hydrochemical type is given priority to with HCO₃-Ca type, then HCO₃-Ca·Mg type. Along the direction of groundwater flow, the groundwater chemical types evolved from HCO₃-Ca to HCO₃·SO₄-Ca in the Dongliao River Basin, which evolved from HCO₃-Ca to HCO₃-Ca·Mg and HCO₃-Ca·Na in the Xiliao River Basin. The hydrogeochemistry is mainly from weathering and dissolving filtration in the recharge area of groundwater to evaporation concentration and cation exchange in the runoff-discharge area of groundwater.更多还原