新疆霍城县水环境同位素特征及其指示作用

Feature of isotopes of water environment and their indication in Huocheng County of Xinjiang

在分析研究区水文地质条件基础上,根据同位素测试结果,重点分析了地下水、泉水及地表水氢氧稳定同位素和氚同位素的分布特征。潜水δD变化范围为-87.71^-75.40‰,δ18O为-12.80^-10.91‰。承压水δD为-90.44^-65.57‰,δ18O为-13.08^-8.17‰。地下水氚浓度主要集中在15~30TU范围内,绝大部分地下水为1953年以前所补给。地下水与地表水均起源于当地大气降水。潜水与承压水水力联系较强,潜水与承压水属于同一含水系统,在开发过程中要十分注重保护这一含水系统,防止过度开发导致含水系统遭到破坏。

On the basis of analyses of hydrogeological conditions of the study area, according to the isotope test results, the distribution characteristics of hydrogen and oxygen stable isotopes and tritium isotope of groundwater, spring and surface water were emphatically analyzed. Unconfined water δD varies from 87.71‰ to 75.40‰, δ^18O varies from 12.80‰ to 10.91‰. Confined water δD varies from 90.44%0 to 65.57‰, δ^180 varies from 13. 08‰ to 8.17‰. Tritium concentration in the groundwater mainly varies from 15 TU to 30 TU. The vast majority of the groundwater were recharged by 1953 years ago. Groundwater and surface water are originated from the local atmospheric precipitation. Mutual transformation between unconfined and confined water is frequent, and there is a stronger connection; unconfined and confined water belong to the same aquifer system. In the process of development of groundwater, it should be payed attention to protect the water system, prevent the excessive development of unconfined or confined water from destructing the aquifer system.