WANG Chen, SUN Zhanxue, LI Jiale, LIU Jinhui, ZHOU Zhongkui, WU Guangyin, HUANG Qiwei，YANG Bo

(School of Water Resources and Environment Engineering, East China University of Technology, Nanchang 330013, China)

Abstract: 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.

Key words: groundwater formation; hydrogen and oxygen stable isotopes; Beishan pre-selected area

EARTH AND ENVIRONMENT Vol.48, No.3, Tot No.335, 2020, Page 377-384