北京市永定河流域地下水的环境同位素分析

同位素方法作为一种较新的,在国际、国内都被普遍采用和认可的方法,可以解决许多水文地质问题,如地下水年龄、地下水运动以及补给问题。该项研究是在研究区设取样点十五个进行取样,对采集的水样进行氘、氧、氚含量分析,并取地下水进行水化学分析。浅层孔隙水和基岩裂隙水的氚含量都在14.99~30.56TU之间,深层孔隙水基本在0.51~4.71TU之间。对地下水氚含量进行分析,判断地下水的形成类型及水循环情况,对地下水氘、氧之间的关系进行分析,从而判断地下水的补给来源等。

Analysis of Groundwater Isotopes in Yongding river Plain of Beijing

As a new means in hydrogeology,the isotopes have been widely applied and recognized both internationally and domestically.The measurements applied to research problems of hydrogeology such as the age,the motion and the resource of groundwater and so on.The aim of this study is to search the evolvement of groundwater of the Yongding river plain in the rural of Beijing with the analysis of isotopes content in groundwater.The sampling section is laid along the flow direction of groundwater in Yongding river pluvial and alluvial fan and sampling spots are laid along the section.The next step is to measure the deuterium,oxygen,tritium content and then calculate the age of the samplings.The rang of the content of tritium of superficial layers pore water and deep layers fracture water is both from 14.99TU to 30.56TU,that of deep layers pore water ranges between 0.51TU and 4.71TU basically.Measuring the tritium content is to judge the form mode of groundwater and the mode of water circulation and analysing the relationship between the deuterium and the oxygen is to judge the origin of groundwater.