北京市城近郊区地下水的环境同位素研究  

A study of environmental isotopes in groundwaters near the suburbs of Beijing

作　　者：王新娟[1] 谢振华[2] 李世君[1] 崔亚莉[1] 邵景力[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]北京市地质工程勘察院水资源研究所,北京100037

出　　处：《地学前缘》2006年第1期205-210,共6页Earth Science Frontiers

基　　金：中国地质调查局国土大调查项目:华北平原地下水可持续利用调查评价项目(200310400002)

摘　　要：应用环境同位素方法，研究北京城近郊区地下水演化规律。沿北京市永定河冲洪积扇地下水流动方向取样15组（D、^18O、T、^14C及全分析），对所取水样进行D、^18O、T、^14C分析，并确定地下水同位素年龄。运用地下水^14C和T含量在垂向和水平方向变化的结果，验证了地下水的流向并计算了地下水的流速变化范围为5．02-62．63m／a，从山前至平原浅层地下水径流速度逐渐变小，反映了地下水水平径流强度逐渐减弱，地下水交替逐渐变差；浅层孔隙水以垂向交替为主，深层孔隙水以水平径流为主。对地下水D、^18O之间的关系进行分析，从而判断地下水的补给来源等。We have studied the evolution of groundwaters in the Yongding River Plain near the suburbs of Beijing, using stable isotope geochemistry. We collected fifteen groups of samples along the flow direction. groundwater in the pluvial and alluvial fans of the Yongding River. The contents of deuterium, oxygen, tril urn and ^14C, were measured, and the ages calculated. By analyzing the changes in the ^14C age and in the conte： of tritium of the groundwaters along vertical and horizontal directions, we can calculate the flow velocity. TI calculated flow velocity ranges from 62.63 m/a to 5.02 m/a. The flow velocity in the superficial aquifer decreases gradually from the piedmont to the plain, as does the shallow subsurface runoff. The groundwater cyclic variations occur mainly vertically in the near-surface aquifer, and horizontally in the deeper aquifer. One, the main tasks of this study is to understand the relationship between the content of deuterium and oxygen order to judge the origin of the groundwaters.

关 键 词：地下水 环境同位素方法 ^14C年龄 永定河 

分 类 号：P641.8[天文地球—地质矿产勘探] P597[天文地球—地质学]