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Numerical Modelling and Laboratory Experiments of Tritium Transport in Unsaturated Soil

Jun Koarashi, Takao Iida, Mariko Atarashi-Andoh, Hiromi Yamazawa, Hikaru Amano

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 464-469

Environment / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 /

Numerical models for simulating tritiated water (HTO) transport in unsaturated soil were developed to assess the migration of HTO from contaminated groundwater to terrestrial biosphere. Column experiments using sandy soil and deuterated water (D2O) were performed and a scenario of HTO transport from contaminated aquifer to atmosphere through an unsaturated soil zone was investigated. The results obtained by both model calculations and column experiments indicated that hydraulic conductivity of soil is an important soil parameter characterizing D2O transport speed and that dispersion and advection are dominant elemental transport processes in unsaturated soil.

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