摘要
为克服应用氚同位素方法确定现代地下水年龄过程中存在的,需确定地下水系统输入项的历史背景浓度问题,本文根据地下水同位素数学物理方程,以全混模型为例,利用不同时期地下水同位素的测试结果,通过数学迭代运算,推导出计算现代地下水年龄的计算公式。该方法不仅可以很好地解决地下水系统输入项氚背景浓度恢复时间序列较长的问题,而且对于提高地下水的定年精度具有十分重要的意义。该方法应用到银川平原取得良好的效果,研究表明银川平原浅层地下水的周转时间为30 a。
In order to overcome difficulties in the recovery of historical tritium concentration in the determination of shallow groundwater age by the method of mathematical physical model, this paper, just taking the expolatianal model as the example, deduces a new formula to calculate the groundwater age based on the equation of the tritium mathematical physical and the tritium analysis results in different times. This method is of significance both to overcome the difficulties in the recovery of the historical tritium concentration and to enhance the accuracy of age-dating. A case study from Yinehuan basin shows a good result and the mean age of shallow groundwater in Yinchan basin is about 30 years.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2006年第4期33-36,共4页
Coal Geology & Exploration
基金
国家重点基础研究发展规划项目(G1999043606)
英国皇家协会研究项目(No.Q778)
关键词
现代地下水年龄
氚同位素
迭代法
modem groundwater age
tritium isotope
iterative method
