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昌平平原区位于北京平原区的西北部,是重要的地下水水源地,在城市供水中发挥着不可替代的作用。本文以研究区24眼监测井2015年枯水期和丰水期水质监测数据为基础,综合运用Piper图、Schoeller图、Gibbs图等不同方法以及同位素技术,分析探讨了研究区地下水在枯、丰水期主要水化学参数浓度变化情况及地下水补给来源。结果表明:(1)研究区地下水水化学特征受季节变化影响显著,HCO_3~–、Ca~(2+)、Na~+等主要离子浓度季节变化程度大,且在枯水期浓度空间分布差异尤为明显。(2)研究区地下水水化学类型以HCO_3-Ca-Mg型为主,但随季节变化部分地区由HCO_3-Ca-Mg型向HCO_3-Na-K型演化。(3)研究区地下水主要起源于大气降水补给,岩石风化及水岩作用是水化学类型形成的主控因素。
Located in the northwest of Beijing Plain, Changping Plain is an important underground water source and plays an irreplaceable role in urban water supply. Based on the monitoring data of 24 monitoring wells in the study area during the dry season and wet season in 2015, using Piper, Schoeller, Gibbs and other methods and isotope techniques, the paper analyzes the effects of groundwater in dry and wet periods Change of Concentration of Major Water Chemical Parameters and Sources of Groundwater Replenishment. The results show that: (1) The hydrochemical characteristics of groundwater in the study area are significantly affected by the seasonal changes. The major ion concentrations of HCO 3 ~ -, Ca ~ (2 +) and Na ~ + have great seasonal changes, especially in the dry season . (2) The hydrochemical types of groundwater in the study area are mainly HCO_3-Ca-Mg type, but they change from HCO_3-Ca-Mg type to HCO_3-Na-K type in some areas according to the seasons. (3) Groundwater in the study area mainly originated from recharge of atmospheric precipitation. Rock weathering and water-rock effect were the main controlling factors for the formation of hydrochemical types.