2021 Fiscal Year Final Research Report
Development and application of three-dimensional soil moisture measurement method using X-ray Computer Tomography
| Project/Area Number |
19K04626
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Kindai University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
麓 隆行 近畿大学, 理工学部, 教授 (30315981)
河井 克之 近畿大学, 理工学部, 教授 (30304132)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | X線CT / 土壌水分 / 凍上 / DVC |
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| Outline of Final Research Achievements |
Experiments using X-ray CT to estimate the volumetric water content distribution and water evaporation of unsaturated silica sand indicated the possibility of Experiments using X-ray CT to estimate the volumetric water content distribution and water evaporation of unsaturated silica sand indicated the possibility of estimating the amount of evaporation from the CT value and the integrated brightness value of the sand.
The three-dimensional distribution of volumetric strain due to freezing and thawing was calculated by Digital Volume Correlation to three-dimensional images of saturated silica sand before freezing, after freezing, and after thawing taken by X-ray CT. The time change of the distribution of volume strain in the soil was measured by the three-dimensional images of silica sand cooling from the bottom, and it was confirmed that as the freezing of the soil progressed from the bottom upward, the volume strain also expanded upward.
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| Free Research Field |
水文学
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| Academic Significance and Societal Importance of the Research Achievements |
X線CTを用いた不飽和珪砂の体積含水率分布と水蒸発量の推定実験の結果より，水分センサーなどを用いた点計測ではなく，X線CTにより三次元的に土壌水分量を計測し，さらに蒸発量のような水分変化量の計測の可能性が示された．
また凍結土壌を用いた実験より，凍上現象のメカニズムを解明する上で，X線CTと三次元画像相関法を用いることで，凍結・融解に伴う移動量・体積ひずみなどの土壌の変形を示す物理量を連続的かつ三次元的に追跡できることを示した点に，学術的な意義があると考えられる．
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