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| 高放废物处置库北山预选区及其邻区深部地下水氢、氧同位素特征 |
| Characteristics of Hydrogen and Oxygen Isotopes in the Deep Groundwater of the Pre-selected Area for High-level Radioactive Waste Disposal Repository in Beishan and Its Adjacent Areas |
| 投稿时间：2019-06-18 修订日期：2019-11-20 |
| DOI：10.14050/j.cnki.1672-9250.2020.48.046 |
| 中文关键词: 地下水成因;氢氧稳定同位素;北山地区 |
| 英文关键词: groundwater formation;hydrogen and oxygen stable isotopes;Beishan pre-selected area |
| 基金项目:放射性地质与勘探技术国防重点学科实验室开放基金（RGET1808）。 |
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| 中文摘要: |
| 为了解高放废物处置库北山预选区深部地下水是否会通过断裂流入河西走廊地区，危害当地的生态环境和人民安全，本文以北山预选区及其邻区为研究对象，利用同位素地球化学方法，建立了研究区当地大气降水线方程和同位素高程效应方程，通过对比两个系统地下水δD、δ18O值和氘盈余特征的差异，确定北山地区与走廊地区的深部地下水具有不同的起源，即北山预选区深部地下水起源于地质历史时期受到过强烈蒸发的大气降水，祁连山北麓-河西走廊地区地下水呈现出典型的现代大气降水补给特征，没有表现出明显的蒸发特征，氢、氧稳定同位素特征表明北山预选区深部地下水并未进入走廊地区，为高放废物处置库的选址工作提供一定的理论依据。 |
| 英文摘要: |
| In order to understand whether the deep groundwater in the Beishan pre-selected area of high-level waste disposal repository will flow into the vast Hexi Corridor area through faults and such to endanger the ecological environment and people's health, this paper selected the Beishan Pre-selected area of high-level waste disposal repository and its adjacent areas as the research object and used isotope geochemical methods as the main research technique. The local atmospheric precipitation line equation and the isotope elevation effect equation of the study area were established and origins of deep groundwaters in the Beishan area and the Hexi corridor area were identified by comparing δD, δ18O and D-excess values in the two groundwater systems. The recharge relationship between deep groundwaters of Beishan and Hexi Corridor areas were investigated. The results showed that the deep groundwater in the Beishan pre-selected area originated from atmospheric precipitations which had been evaporated strongly during the geological history, while the deep groundwater in the area of northern Qilian mountain piedmont-Hexi Corridor was replenished typical by modern meteoric water with no obvious evaporation. The evidences from Hydrogen and Oxygen isotopes showed that the deep groundwater in the Beishan pre-selected area didn't enter the Hexi Corridor area. Results of this study provided a theoretical basis for pre-selecting Beishan as a site of high-level waste disposal repository. |
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