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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/59109d1c79ba-1249-4a0c-b309-242846b7ae7c
| Item type | researchmap(1) | |||||||||||||||
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| 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
× Hiroyuki Hirashima
× Satoru Yamaguchi
× Takafumi Katsushima
× 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 |
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| 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 | |||||||||||||||
