以柴达木盆地的诺木洪为研究区，利用氚与14 C方法计算了当地各水体的年龄，分析地下水年龄分布特征及其可更新能力。结果表明：山区至冲洪积扇中部地下水年龄为15～18 a，为1952年之后补给的现代水，更新能力较强；冲洪积扇前缘地下水年龄不超过2 ka，具有现代水与古水混合的特征，更新能力较差；溢出带到盆地中心地下水年龄急剧变老，变化范围为5～28 ka，据此推测研究区溢出带位置的隐伏断层具阻水性质，该位置的地下水基本无更新能力。%By utilizing the 3 H and 14 C dating methods,this paper calculated the distribution of groundwater age and then analyzed the groundwater renewability in the study area of Nuomuhong in Qaidam basin.The results show that:(1)in areas from the mountain to the middle part of the alluvial-proluvial fan,the groundwater age varies slightly (15 -18 a),indicating that the groundwater is recharged after 1952 with a strong renewability;(2)the groundwater age,in the leading edge of the alluvial-proluvial fan,is less than 2 ka,indicating that the groundwater is a mixture of the modern groundwater with the fossil groundwater and has a poor renewability;(3)in areas from overflow zone to the center of the basin,the groundwater age gets older rapidly from 5 ka to 28 ka,indicating that the hidden fault underlaid the overflow zone has the property of water blocking,and that groundwater in this area can be considered as unrenewable resources.
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