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  1. 防災科研関係論文

Observations of capillary barriers and preferential flow in layered snow during cold laboratory experiments

https://nied-repo.bosai.go.jp/records/5910
https://nied-repo.bosai.go.jp/records/5910
9d1c79ba-1249-4a0c-b309-242846b7ae7c
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Observations of capillary barriers and preferential flow in layered snow during cold laboratory experiments
言語
言語 eng
著者 Francesco Avanzi

× Francesco Avanzi

en Francesco Avanzi

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Hiroyuki Hirashima

× Hiroyuki Hirashima

en Hiroyuki Hirashima

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Takafumi Katsushima

× Takafumi Katsushima

en Takafumi Katsushima

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Carlo De Michele

× Carlo De Michele

en Carlo De Michele

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抄録
内容記述タイプ Other
内容記述 Data of liquid water flow around a capillary barrier in snow are still limited. To gain insight into this process, we carried out observations of dyed water infiltration in layered snow at 0aEuro-A degrees C during cold laboratory experiments. We considered three different finer-over-coarser textures and three different water input rates. By means of visual inspection, horizontal sectioning, and measurements of liquid water content (LWC), capillary barriers and associated preferential flow were characterized. The flow dynamics of each sample were also simulated solving the Richards equation within the 1-D multi-layer physically based snow cover model SNOWPACK. Results revealed that capillary barriers and preferential flow are relevant processes ruling the speed of water infiltration in stratified snow. Both are marked by a high degree of spatial variability at centimeter scale and complex 3-D patterns. During unsteady percolation of water, observed peaks in bulk volumetric LWC at the interface reached similar to 33-36aEuro-vol % when the upper layer was composed by fine snow (grain size smaller than 0.5aEuro-mm). However, LWC might locally be greater due to the observed heterogeneity in the process. Spatial variability in water transmission increases with grain size, whereas we did not observe a systematic dependency on water input rate for samples containing fine snow. The comparison between observed and simulated LWC profiles revealed that the implementation of the Richards equation reproduces the existence of a capillary barrier for all observed cases and yields a good agreement with observed peaks in LWC at the interface between layers.
言語 en
書誌情報 en : CRYOSPHERE

巻 10, 号 5, p. 2013-2026, 発行日 2016-09-09
出版者
言語 en
出版者 COPERNICUS GESELLSCHAFT MBH
ISSN
収録物識別子タイプ EISSN
収録物識別子 1994-0424
DOI
関連識別子 10.5194/tc-10-2013-2016
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