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  1. 防災科研関係論文

Application of a Magnetic Resonance Imaging Method for Nondestructive, Three-Dimensional, High-Resolution Measurement of the Water Content of Wet Snow Samples

https://nied-repo.bosai.go.jp/records/3841
https://nied-repo.bosai.go.jp/records/3841
9a3d5f9e-1855-4bab-a73f-a4b86ab4e1ca
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Application of a Magnetic Resonance Imaging Method for Nondestructive, Three-Dimensional, High-Resolution Measurement of the Water Content of Wet Snow Samples
言語
言語 eng
著者 Satoru Adachi

× Satoru Adachi

en Satoru Adachi

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Toshihiro Ozeki

× Toshihiro Ozeki

en Toshihiro Ozeki

Search repository
Katsumi Kose

× Katsumi Kose

en Katsumi Kose

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抄録
内容記述タイプ Other
内容記述 The infiltration of melted snow water and rainwater into snow can drastically change the form of snow layers. This process is an important factor affecting wet snow avalanches. Accordingly, numerous field surveys and cold room experiments have been conducted to investigate the distribution of water in snow. The common methods of water content measurement (calorimetric and dielectric methods) are implemented by disturbing snow samples to measure them. However, the resolutions obtained are of the order of several centimeters, which hinders the continuous measurement of the water content of a particular sample. Magnetic resonance imaging (MRI), which is typically used in the medical field, can be used to generate a high-resolution three-dimensional (3D) image of the water distribution in samples without destructing them. The luminance of images produced by MRI depends on the volumetric water content of the sample, with luminance increasing with volumetric liquid water content. Therefore, the volumetric liquid water content of the sample can be estimated from its luminance value. Considering this concept, we developed a method to measure the volumetric liquid water content of wet snow samples using MR images. To evaluate the developed method, we prepared several wet snow samples and measured their various volumetric liquid water contents using MRI (theta(MRI)) and the calorimetric method (theta(cal)). theta(MRI), and theta(cal)showed good correlation when compared, with values in the range 0.02-0.46. Therefore, our system can accurately and non-destructively measure water content. The developed method using MRI can measure 3D volumetric liquid water contents with a high resolution (2 mm). Using the developed method, we investigated the hysteresis of the water retention curve of snow based on the measurements of a wetting process (boundary wetting curve) and a drying process (boundary drying curve) of the water retention curve for each sample. Our results indicate the existence of hysteresis in the snow water retention curves and the possibility of modeling it by adopting contexts of soil physics.
言語 en
書誌情報 en : FRONTIERS IN EARTH SCIENCE

巻 8, 発行日 2020-06-10
出版者
言語 en
出版者 FRONTIERS MEDIA SA
ISSN
収録物識別子タイプ EISSN
収録物識別子 2296-6463
DOI
関連識別子 10.3389/feart.2020.00179
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