江油市规划应急水源地地下水水化学特征分析

Analysis on the Hydrochemical Characteristics of Groundwater of Emergency Water Source in Jiangyou City

通过在江油市规划应急水源地及其上、下游采集地下水水样进行化学分析,共采集15个样品。结合主离子浓度、Piper图及沿程变化对该水源地地下水的水化学特征及其上、下游地下水水化学变化规律进行分析,结果表明:研究区地下水呈弱碱性,属硬度水和极硬度水,TDS平均值为281.446mg/L,其中阳离子以Ca^(2+)、Mg^(2+)为主,Na^++K^+次之;阴离子以HCO_3^-和SO_4^(2-)为主,Cl^-较少;地下水的化学类型为HCO_3^--Ca^(2+)。在沿程变化上,自上游至下游,地下水TDS及主离子均有整体增加的现象。地下水化学类型由HCO_3^--Ca^(2+)型变化为HCO_3^-·SO_4^(2-)-Ca^(2+)·Mg^(2+)型。

15 water samples were collected through chemical analysis in Jiangyou City emergency water source and its upper and lower reaches. The hydrochemicai characteristics of the groundwater source and the change law of hydrochemical of the upstream and the downstream were analyzed according to the concentration of main ions, Piper diagram and the variation along the Jianjiang River. The results show that the groundwater in the study area is weak alkaline belonging to hard water and extremely hard water. The average value of TDS is 281. 446mg/L, the main cations are Ca^2＋ and Mg^2＋ , and Na^＋ ＋ K^＋ the second; the anion is mainly HCO3^- and SO4^2- with less CI- and the chemical type of groundwater is HCO3^--Ca^2＋. From upstream to downstream, there is an overall increase in both TDS and main ions of groundwater. The chemical type of groundwater changed from HCO3^- -Ca^2＋ type to HCO^-· SO4^2--Ca^2＋ · Mg^2＋ type.