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Infiltration Analysis of a Multi-Layer Cover System Considering Bedrock Heterogeneity and Rainfall Variability KCI 등재 SCOPUS
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/438720
pp.451-464
This study evaluates the long-term performance of a multi-layer cover system (MLCS) for near-surface disposal facilities using numerical modeling to estimate infiltration rates under various rainfall scenarios. An effective cover system is essential to prevent radionuclide migration and protect groundwater inflow within disposal facility. The analysis incorporated different bedrock characteristics (homogeneous and discrete fracture networks) and rainfall patterns throughout a 300-year post-closure period, assuming constant initial hydraulic properties. A comprehensive modeling approach incorporating both saturated and unsaturated flow dynamics was employed to assess system performance. Results showed that the cover system effectively limited infiltration rates to 15.94%−21.25% of the design criterion (32 mm∙year−1) across all scenarios. Although infiltration patterns showed minimal sensitivity to bedrock heterogeneity, preferential flow along fractures was observed in the unsaturated zone, necessitating further investigation. These findings emphasize the importance of considering fracture-dominated flow in cover system design and highlight the need for detailed analysis of chemical degradation effects, experimental validation, and uncertainty quantification. The study provides valuable insights for optimizing disposal facility designs and improving long-term performance assessment methodologies.
2. Methodology
2.1 Conceptual Model
2.2 Governing Equations
2.3 Numerical Modelling
3. Modelling Results
3.1 CASE #1
3.2 CASE #2
3.3 CASE #3
3.4 CASE #4
4. Findings
Conflict of Interest
Acknowledgements
REFERENCES
