中国西北干旱区多级洼地地下水环境同位素分布特征及指示意义

现代地质 ›› 2011, Vol. 25 ›› Issue (6): 1195-1200.

中国西北干旱区多级洼地地下水环境同位素分布特征及指示意义

孙琦^1,2，余翔¹，周训²，陈剑杰¹，高为超¹

1 西北核技术研究所，陕西西安710024；2 中国地质大学水资源与环境学院，北京100083

收稿日期:2911-07-10 修回日期:2011-09-22 出版日期:2011-12-14 发布日期:2011-12-15

Distribution Characteristics of Groundwater Environmental Isotopes in a Multilevel Basin in Arid Area of the Northwestern China and Their Indication

SUN Qi^{-1, 2} , TU Xiang^-1, ZHOU Xun^-2, CHEN Jian-Jie^-1, GAO Wei-Chao^-1

1Northwest Institute of Nuclear Technology, Xian, Shaanxi710024, China;
2 School of Water Resources and Environment, China University of Geosciences, Beijing100083, China

Received:2911-07-10 Revised:2011-09-22 Online:2011-12-14 Published:2011-12-15

摘要/Abstract

摘要：

研究区位于西北干旱区，有两级储水洼地，地下水由山区侧向补给一级洼地，一级洼地通过泉水排泄地下水继而补给二级洼地，同时大气降水直接入渗、洪流间接入渗补给各储水洼地。通过氢氧同位素比例公式计算得到一级洼地大气降水占总补给量60％，其中直接补给量约占21%，山区洪流补给量约占79%，另外，山前侧向补给占40%；二级洼地降水补给量占38%，上游泉水补给量占62%。通过氚值指示，二级洼地不受现代降水影响；活塞流与全混合模型计算得到一级洼地浅层孔隙水平均年龄为32~60 a。

关键词: 氢氧同位素, 氚同位素, 干旱地区, 中国西北

Abstract:

The study area is located in the arid area in the Northwestern China and two levels of water storage basins exist. The firstlevel basin receives the lateral recharge from the southern mountain area. Spring discharge from the firstlevel basin flows into and recharges the next basin, at the same time groundwater in each levels of basin receives recharge from direct precipitation and indirect infiltration of flood flow. Based on hydrogen and oxygen isotope mixture formula, the precipitation amount accounts for 60% of the total recharges, of which, direct recharge from precipitation is estimated 21%, and recharge from flood flow is estimated 79%. Lateral recharge from the mountain area is about 40%. The secondlevel basin receives 38% recharge from precipitation, and the upstream spring discharge accounts for 62%. The quantity of tritium indicates that the se
condlevel basin is not affected by present precipitation. Using the piston model and the complete mixing model, the age of shallow groundwater in the firstlevel basin is estimated to range from 32 to 60 a.

Key words: stable hydrogen and oxygen isotopes, tritium isotope; , arid area, Northwestern China

孙琦, 余翔, 周训, 陈剑杰, 高为超. 中国西北干旱区多级洼地地下水环境同位素分布特征及指示意义[J]. 现代地质, 2011, 25(6): 1195-1200.

SUN Qi, TU Xiang, ZHOU Xun, CHEN Jian-Jie, GAO Wei-Chao. Distribution Characteristics of Groundwater Environmental Isotopes in a Multilevel Basin in Arid Area of the Northwestern China and Their Indication[J]. Geoscience, 2011, 25(6): 1195-1200.

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