| Citation: | LI Jiebiao，ZHOU Zhichao，GUO Yonghai，et al. Hydrogeochemical modeling of groundwater formation mechanism at the Beishan preselected site for high-level radioactive waste disposal[J]. Bulletin of Geological Science and Technology，2025，44（4）：340-353 doi: 10.19509/j.cnki.dzkq.tb20240194
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Hydrogeochemical characteristics play a pivotal role in site selection and long-term safety assessment for high-level radioactive waste (HLW) disposal repositories.
This study employs integrated hydrogeochemical analysis and modeling to investigate the basic hydrogeochemical characteristics, horizontal zoning, and formation mechanisms in different hydrogeological zones of the Beishan preselected site for HLW disposal in Gansu Province, China.
The results show that the predominant hydrogeochemical types were Cl·SO4-Na and SO4·Cl-Na, Province with pH values generally ranging from 7.5 to 8.3. Fractured bedrock groundwater is typically undersaturated with respect to halite, gypsum, fluorite, glauconite, and feldspar, and oversaturated with respect to clay minerals. A distinct horizontal zonation is observed in the hydrogeochemical composition from the recharge area to the discharge area. The Mazongshan region serves as the primary recharge zone, characterized by low mineralization, where hydrogeochemical composition is mainly controlled by leaching processes. The sedimentary basins act as the main discharge areas with high mineralization, where evaporation processes dominate. The water-rock interaction processes along the flow path are primarily driven by the dissolution of halite and gypsum, while the effect of carbonate and silicate dissolution or precipitation remains relatively weak.
Overall, the hydrogeochemical formation of fractured bedrock groundwater in the Beishan area is predominantly governed by evaporation and water-rock interaction processes. This study provides fundamental hydrogeochemical data and insights to support the site selection of the HLW disposal repository.
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