An experimental and numerical study on radon transport from UMT-contaminated sand to a house basement under variable weather conditions
| Autor: | Laurent Marie, Zakaria Saâdi |
|---|---|
| Přispěvatelé: | Institut de Radioprotection et de Sûreté Nucléaire (IRSN) |
| Rok vydání: | 2017 |
| Předmět: |
Atmospheric air
geography geography.geographical_feature_category Process Chemistry and Technology 0208 environmental biotechnology chemistry.chemical_element Radon Aquifer 02 engineering and technology 010501 environmental sciences Contamination 01 natural sciences Pollution Tailings 020801 environmental engineering chemistry Evapotranspiration [SDE]Environmental Sciences Soil water Chemical Engineering (miscellaneous) Geotechnical engineering Porosity Waste Management and Disposal Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Environmental Chemical Engineering Journal of Environmental Chemical Engineering, 2017, 5 (4), pp.3667-3683. ⟨10.1016/j.jece.2017.07.017⟩ |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2017.07.017 |
| Popis: | International audience; Numerical modelling is necessary in order to better understand transient phenomena of radon transport from radium-contaminated soils to a house basement where high radon levels were observed. The present work aims to develop a robust and simplified subsurface numerical model which can simulate radon transport at the soil-basement foundation interface under variable weather conditions around a house. The equivalent continuum modelling (ECM) approach has been used assuming an equivalent porosity and permeability of the basement foundation cracked concrete materials. This approach has been applied for simulating two-dimensional (2D) soil-gas and radon-entry into a house basement built on sand contaminated by uranium mill tailings (UMT) considering the presence of an aquifer with water-table, rainfall, evapotranspiration, atmospheric air pressure, and house under-pressurization. Sensitivity analysis of the model foundation parameters, performed at steady-state, showed that the numerical model predictions at transient conditions were in a good agreement with measurements of the radon-entry-rate through the basement foundation and radon concentration in the basement. The optimized parameters are physically sound and consistent with the observations and literature data. © 2017 Elsevier Ltd. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect