Abstract
The soil-gas diffusion coefficient (Dp) and its dependency on air-filled porosity (ε) govern the gas diffusion and reaction processes in soil. Accurate Dp(ε) prediction models for variably saturated peat soils are needed to evaluate vadose zone transport and fate of greenhouse gases such as methane in peaty wetlands. In this study, we measured D p on peat soil samples at different soil-water matric potentials, and developed new, linear and nonlinear expressions for describing and predicting Dp(ε). Undisturbed peat soil samples were taken from Bibai wetland, Hokkaido, Japan. By modifying 3 existing Dp(ε) models, the Buckingham model, the Macroporosity-Dependent model, and the Penman-Call model, we suggested 3 new Dp(ε) models for peat soils. To validate the new Dp(ε) models, we tested the models against independent datasets for peat soil samples from literatures. The modified Buckingham type model performed the best against independent datasets.
Originalsprog | Engelsk |
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Titel | Unsaturated Soils : Theoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils |
Antal sider | 5 |
Publikationsdato | 2010 |
Sider | 697-701 |
ISBN (Trykt) | 9780415804806 |
Status | Udgivet - 2010 |
Begivenhed | 4th Asia Pacific Conference on Unsaturated Soils - Newcastle, NSW, Australien Varighed: 23 nov. 2009 → 25 nov. 2009 |
Konference
Konference | 4th Asia Pacific Conference on Unsaturated Soils |
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Land/Område | Australien |
By | Newcastle, NSW |
Periode | 23/11/2009 → 25/11/2009 |