辛安泉岩溶水系统特征的环境同位素研究

Study on Environmental Isotope of Karst Water System within Xin’an Spring Basin

摘要: 为了探究泉域内的岩溶水系统的更新转化特征，选用具有可以快速、准确地了解地下水资源的各种属性的环境同位素示踪方法对辛安泉域内的岩溶水系统的更新转化特征进行了研究。本文以辛安泉域内的岩溶水系统的更新转化为例，通过对辛安泉域岩溶水、孔隙水、地表水中锶同位素所占比重及其空间分布特征的计算与分析，探索了泉域岩溶水系统的转化关系。同时，通过对各个泉域排泄区处的氚含量值的分析，估算出岩溶地下水的平均年龄，进而进一步研究了其更新交替的能力。研究表明：研究域岩溶水具有多样性的补给来源，平均地下水年龄为107a，整个泉域水资源的更新交替也相对频繁。由以上可以证明环境同位素示踪法是探究地下水资源属性行之有效的方法。

Abstract: In order to explore the transformation characteristics of the karst water system in Spring Basin with the environmental isotope tracing method which has the characteristics of fast and accurate understanding of the groundwater resources, the renewal and transformation characteristics of the karst water system in the Xin’an spring domain were studied. Taking Xin’an Spring in the domain of update transformation as example to analyze the proportion of strontium isotope and characteristics of spatial distribution in karst water, pore water and surface water in the basin, the transform relationship was explored on karst water system. By analyzing the value of tritium isotope in each discharge area of spring basin, the average age of karst groundwater was estimated and then renewability and alternation capability were analyzed. It is shown that karst water system in Xin’an Spring Basin has diversity on recharge sources, and the average age of groundwater is 107a; the renewability and alternation of the whole water resources of the spring area are frequently updating. The analysis method of environmental isotope tracing is proved to be effective in the work of exploring the water resource attributes of groundwater system.