Articles | Volume 58
https://doi.org/10.5194/adgeo-58-77-2022
https://doi.org/10.5194/adgeo-58-77-2022
23 Nov 2022
 | 23 Nov 2022

The influence of sedimentary heterogeneity on the diffusion of radionuclides in the sandy facies of Opalinus Clay at the field scale

Chaofan Chen, Tao Yuan, Renchao Lu, Cornelius Fischer, Olaf Kolditz, and Haibing Shao

Model code and software

OpenGeoSys L. Bilke, T. Fischer, D. Naumov, C. Lehmann, W. Wang, R. Lu, B. Meng, K. Rink, N. Grunwald, J. Buchwald, C. Silbermann, R. Habel, L. Günther, M. Mollaali, T. Meisel, J. Randow, S. Einspänner, H. Shao, K. Kurgyis, O. Kolditz, and J. Garibay https://doi.org/10.5281/zenodo.7092676

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Short summary
The moving distance of the diffusion front is farther away the canister center, along the direction with the neighboring layer having lower diffusion coefficient. When the bedding angle increases, the diffusion front moves farther in z+ direction, reflecting the increase in effective diffusivity and higher impact of parallel-to-bedding diffusion. The neighboring layers can slightly reshape the diffusion front line of the radionuclide.