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  1. 防災科研関係論文

Nondestructive three-dimensional observations of flow finger and lateral flow development in dry snow using magnetic resonance imaging

https://nied-repo.bosai.go.jp/records/4251
https://nied-repo.bosai.go.jp/records/4251
d3704033-9455-43f5-8c8f-2f1ed5822215
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Nondestructive three-dimensional observations of flow finger and lateral flow development in dry snow using magnetic resonance imaging
言語
言語 eng
著者 Takafumi Katsushima

× Takafumi Katsushima

en Takafumi Katsushima

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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

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Toshiro Kumakura

× Toshiro Kumakura

en Toshiro Kumakura

Search repository
抄録
内容記述タイプ Other
内容記述 Flow fingers develop due to the infiltration of snow meltwater or rain water into a dry snowpack. The width, spacing, and areal coverage of the flow finger path and occurrence of capillary barriers have been demonstrated using dye tracer experiments that were conducted in the field and in cold laboratories. Because dye tracer experiments require the destructive analysis of the snow, the initial shape, and the temporal development of fingering and lateral flows are unclear. To examine this, we carried out nondestructive observations of flow finger development, and the formation of capillary barriers using two different dry snow samples in a cold laboratory using magnetic resonance imaging (MRI) with a three-dimensional rapid imaging method. X-ray micro-computed tomography (mu CT) was also used to determine the relationship between the water flow phenomena and the snow microstructure. The experimental results showed that flow fingers developed in dry snow samples. The number of flow finger paths increased, and a lateral flow developed through the continuing water supply. The small discontinuity of the pore size and snow density in the vertical direction acted as a capillary barrier and induced lateral flow. These results showed that both the persistence of the flow finger path and the increase in the number of flow paths are important for understanding the infiltration of water into dry snow and for developing a snowpack model that includes water-moving processes. Nondestructive observation using MRI is a promising technique to follow the development of preferential flow path and lateral flow. Detailed information regarding the heterogeneity of the pore distribution and snow microstructures in a layered snowpack is required to understand the water flow phenomena in a natural snowpack.
言語 en
書誌情報 en : COLD REGIONS SCIENCE AND TECHNOLOGY

巻 170, p. 102956
出版者
言語 en
出版者 ELSEVIER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1872-7441
DOI
関連識別子 10.1016/j.coldregions.2019.102956
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