利用环境氚定量确定秦岭特长隧道地下水年龄  

Groundwater Age Determined with Environmental Tritium in Qinling Tunnel Area

作　　者：刘丹[1] 李启彬[1] 

机构地区：[1]西南交通大学环境科学与工程学院,四川成都610031

出　　处：《西南交通大学学报》2002年第6期601-605,共5页Journal of Southwest Jiaotong University

基　　金：铁道部重点科技项目(95C48 H)

摘　　要：利用环境氚并借助于同位素数学物理模型,定量确定了秦岭特长隧道地区地下水的滞留时间。下部地下水平均年龄均在43年以上,岭脊地带高达70年,明显老于浅层水(仅1～5年),这表明该两类地下水的动力条件存在明显差异。斜坡地带下部水年龄往洞口方向有逐渐增加的趋势,反映出在隧址区尺度范围内,裂隙含水介质仍具备水力连续性的特点,这对建立合理的预测隧道涌水量的数学模型具有重要意义。Groundwater residence time is quantitatively determined with environmental tritium and an isotopic mathematical model in Qinling extralong tunnel area. The mean age of all the groundwater is over 43 years, and even up to 70 years in the ridge zone, obviously older than that of shallow groundwater aged only 1 to 5 years. This shows great differences between the two areas in dynamic features. The age of the deep groundwater in slop zones trends to increase towards the tunnel entrance and exit, which indicates that the fissured waterbearing medium is characterized by hydraulic continuity within the tunnel area. This property is of great significance to rationally building the mathematical model for prediction of the waterflow to tunnel.

关 键 词：地下水 年龄确定 环境氚 秦岭特长隧道 环境同位素技术 水文地质 

分 类 号：P641.7[天文地球—地质矿产勘探]