LINEAR MODEL TO PREDICT SOIL-GAS DIFFUSIVITY FROM TWO SOIL-WATER RETENTION POINTS IN UNSATURATED VOLCANIC ASH SOILS

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概要

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• Risk assessment and design of remediation methods at soil sites polluted with gaseous phase contaminant require an accurate description of soil-gas diffusion coefficient (D_p) which is typically governed by the variations in soil air-filled porosity (υ_a). For undisturbed volcanic ash soils, recent studies have shown that a linear D_p(υ_a) model, taking into account inactive air-filled pore space (threshold soil-air content, υ_<a,th>), captured the D_p data across the total soil moisture range from wet to completely dry conditions. In this study, we developed a simple, easy to apply, and still accurate linear D_p(υ_a) model for undisturbed volcanic ash soils. The model slope C and intercept (interpreted as υ_<a,th>) were derived using the classical Buckingham (1904) D_p(υ_a) power-law model, υ^X_a, at two soil-water matric potentials of pF2 (near field capacity condition) and pF4.1 (near wilting point condition), and assuming the same value for the Buckingham exponent (X=2.3) in agreement with measured data. This linear D_p(υ_a) prediction model performed better than the traditionally-used non-linear D_p(υ_a) models, especially at dry soil conditions, when tested against several independent data sets from literature. Model parameter sensitivity analysis on soil compaction effects showed that a decrease in slope C and υ_<a,th> due to uniaxial reduction of air-filled pore space in between aggregates markedly affects the magnitude of soil-gas diffusivity. We recommend the new D_p(υ_a) model using only the soil-air contents at two soil-water matric potential conditions (field capacity and wilting point) for a rapid assessment of the entire D_p-υ_a function.

• 社団法人地盤工学会の論文

著者

• Moldrup Per

  Environmental Engineering Section Dept. Of Biotechnology Chemistry And Environmental Engineering Aal

• Komatsu Toshiko

  Graduate School Of Science And Engineering Saitama University

• Kawamoto Ken

  Saitama Univ. Saitama Jpn

• Kawamoto Ken

  Graduate School Of Science And Engineering Saitama University

• RESURRECCION AUGUSTUS

  Dept. of Engineering Sciences, University of the Philippines-Diliman

• ODA MASANOBU

  Graduate School of Science and Engineering, Saitama University

• YOSHIKAWA SEIKO

  Department of Hilly Land Agriculture, National Agricultural Research Center for Western Region

• Oda Masanobu

  Graduate School Of Science And Engineering Saitama University

• Yoshikawa Seiko

  Department Of Hilly Land Agriculture National Agricultural Research Center For Western Region

• Resurreccion Augustus

  Dept. Of Engineering Sciences University Of The Philippines-diliman

関連論文

• Simazine Sorption and Transport in Soils and Soil Particle Size Fractions
• LINEAR MODEL TO PREDICT SOIL-GAS DIFFUSIVITY FROM TWO SOIL-WATER RETENTION POINTS IN UNSATURATED VOLCANIC ASH SOILS
• Application of GPR to Evaluate Water Table and Peat Layer at Bibai Bog

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