塔里木盆地东北部大气降水氚浓度的恢复及应用

发布时间：2018-11-11 08:45

【摘要】：氚作为一种理想的示踪剂和测年技术手段,在地下水研究中应用广泛。为了解决塔里木盆地东北部地下水氚测年研究中的大气降水氚浓度恢复问题,采用因子分析法,建立了塔里木盆地东北部大气降水氚浓度模型,并用实测数据进行了模型校正,校正后模型计算结果与实测数据吻合良好,表明所建立的大气降水氚浓度模型较合理;同时,考虑到研究区大气中氚含量受20世纪大气层核试验的影响,采纳了前人部分研究成果,最终恢复了该区域1960—2009年大气降水氚浓度值。据此,将所恢复的大气降水氚浓度数据作为输入值,代入到氚测年的活塞流模型和混合流模型,计算了研究区4个地下水样的年龄,并分析了氚年龄计算结果的合理性,认为所获得的年龄数据符合当地水文地质条件,这进一步证明了本文所恢复的大气降水氚浓度值较为可靠。
[Abstract]:Tritium, as an ideal tracer and dating technique, is widely used in groundwater research. In order to solve the problem of tritium concentration recovery in groundwater in the northeast of Tarim Basin, a model of tritium concentration in the northeast of Tarim Basin was established by factor analysis, and the model was corrected with measured data. The calculated results are in good agreement with the measured data, which indicates that the model of tritium concentration in precipitation is reasonable. At the same time, considering that the atmospheric tritium content in the study area is affected by the atmospheric nuclear test in the 20th century, some previous research results have been adopted and the tritium concentration of precipitation in the region from 1960 to 2009 has finally been restored. Based on this, the restored data of tritium concentration in precipitation are taken as input values, and the piston flow model and mixed flow model of tritium dating are added to calculate the ages of four groundwater samples in the study area, and the reasonableness of the calculation results of tritium age is analyzed. It is considered that the obtained age data accord with the local hydrogeological conditions, which further proves that the tritium concentration of atmospheric precipitation recovered in this paper is more reliable.
【作者单位】：南京大学地球科学与工程学院;西北核技术研究所;
【基金】：国家自然科学基金(41171058)
【分类号】：P426.612;P641.3

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