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Radon transport carried by geogas: prediction model
Xiaojie Chen1,2, Yong Liu3, Yourui Jiang1
1School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, Hunan, China.
Radon migration in Earth's crust is complex. Geogas theory, involving gases like CO2 and CH4 in microbubbles, offers a new explanation for anomalous radon concentrations, challenging molecular diffusion alone.
Area of Science:
- Earth Sciences
- Geophysics
- Environmental Science
Background:
- Radon migration in the Earth's crust is a significant area of research.
- Existing studies lack a comprehensive review of large-scale radon transport.
- Molecular diffusion was previously considered the primary migration mechanism.
Purpose of the Study:
- To provide an overview of radon migration mechanisms in the Earth's crust.
- To review the geogas theory and its role in radon transport.
- To explore fracture modeling methods for understanding radon migration.
Main Methods:
- Literature review of radon migration studies.
- Analysis of geogas theory and multiphase flow.
- Examination of discrete fracture network (DFN) modeling.
Main Results:
- Molecular diffusion alone cannot explain anomalous radon concentrations.
- Geogas, particularly CO2 and CH4 in microbubbles, may drive radon migration.
- Fractures are identified as principal channels for geogas migration.
Conclusions:
- Geogas theory provides a framework for understanding rapid radon migration.
- Discrete fracture network (DFN) methods offer advanced tools for fracture modeling.
- This review contributes to a deeper understanding of radon migration and its modeling.
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