摘要
水-岩作用是研究岩溶地下水迁移转化的主要理论基础,采用PHREEQC软件对犀牛洞地下河水-岩作用进行反向模拟。通过模拟得出地下水各矿物相的饱和指数,并计算出地下河径流路径水-岩作用过程中主要矿物相的转移量。模拟结果表明:地下河入口至天窗段水中的H+浓度增大,pH值减小,矿物相的溶解使得Ca2+、Mg2+、HCO3-、SO24-、Na+、Cl-浓度增大;天窗至地下河出口段水中的H+浓度基本保持不变,Mg2+、HCO3-、SO24-浓度增大,而Ca2+浓度因方解石的沉淀而有所减小,模拟结果与实际水质数据相符。
Inverse geochemical simulations about water-rock interaction in Xiniudong Underground River were done based on PHREEQC, for it is one of the major theories on migration and transformation of Karst groundwater. Minerals ＇ saturation indexes of the water samples appeared after simulations, based on which, phase mole transfers of the major minerals in the water-rock interaction process along the underground river runoff were calculated. The results show that ： from the underground river entrance to the skylight, the concentration of H^＋ increased and the value of pH dropped, and the concentrations of Ca^2＋、Mg^2＋、HCO3^-、SO4^2-、Na^＋、Cl^- increased with the continuous dissolution of minerals from the skylight to the underground river outfall, the concentration of H^＋ remained unchanged while the concentrations of Mg^2＋, HCO3^- and SO4^2- were still increasing and of Ca^2＋ decreased because of the precipitation of calcite. These simulations are proved to be effective and consistent with the facts after testing.
出处
《人民黄河》
CAS
北大核心
2012年第10期74-76,共3页
Yellow River
关键词
水-岩作用
反向模拟
矿物相
犀牛洞地下河
water-rock interaction
inverse geochemical simulation
mineral phase
Xiniudong Underground River
