【摘要】 氚同位素作为一种理想的示踪剂被广泛用于地下水循环研究。以玛纳斯河流域为研究区,利用1953-2003年降水氚浓度恢复结果,结合活塞与全混模型得出地下水系统的平均滞留时间,并估算地下水系统的平均更新速率。结果表明:从冲洪积扇到冲洪积平原沙漠区地下水的年龄逐渐增大,滞留时间增长,更新能力变弱。不同地下水系统其更新速率差别较大,其中平原区潜水水流系统氚值最高,地下水的年龄在30年左右,更新速率在6%左右,更新速率最大,地下水更新能力最强。更多还原

【Abstract】 Tritium serves as an excellent tracer for the study of water circulation.With Manasi River basin as the research area and the concentration of tritium in precipitation from 1953-2003 as the research data basis,the piston and the mix models were applied to determine the average retention time and estimate the average renewal rate of the groundwater system.The results showed that from the alluvial-proluvial fan to the desert area of the alluvial plain,the age of groundwater and the retentive time increase,while the renewal capacity decreases.In addition,the results revealed that different groundwater systems differ greatly in their renewal rates,among which the current phreatic water system in the plain area has the highest tritium concentration,the fastest renewal rate and the best renewable capacity.Its tritium age is about 30 years and renewal rate is about 6%.更多还原