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  1. 防災科研関係論文

Application of snow specific surface area measurement using an optical method based on near-infrared reflectance around 900-nm wavelength to wet snow zones in Japan

https://nied-repo.bosai.go.jp/records/5926
https://nied-repo.bosai.go.jp/records/5926
985cc9b6-d79f-4856-b09c-d97908e7d347
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Application of snow specific surface area measurement using an optical method based on near-infrared reflectance around 900-nm wavelength to wet snow zones in Japan
言語
言語 eng
著者 Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Hiroki Motoyoshi

× Hiroki Motoyoshi

en Hiroki Motoyoshi

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Tomonori Tanikawa

× Tomonori Tanikawa

en Tomonori Tanikawa

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Teruo Aoki

× Teruo Aoki

en Teruo Aoki

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Masashi Niwano

× Masashi Niwano

en Masashi Niwano

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Yukari Takeuchi

× Yukari Takeuchi

en Yukari Takeuchi

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Yasoichi Endo

× Yasoichi Endo

en Yasoichi Endo

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抄録
内容記述タイプ Other
内容記述 The specific surface area (SSA) of snow can be used as an objective measurement to define the optical sphere diameter of snow; it is therefore a helpful parameter to describe the physical properties of snow, such as albedo. Recently, measurement of snow SSA in the field has become easier with the use of optical methods based on near-infrared reflectance values (Ref). However, existing optical methods have only been validated for dry snow conditions in the field. In this study, we tested the possibility of applying the optical method using light with wavelength of around 900 nm (NIR photometry) to wet snow zones in Japan by comparing the findings with snow pit observation data. Our results indicated that NIR photometry can be applied to wet snow zones before the main melt season when the liquid water content is small, but problems arose during melt season due to the appearance of darker layers with more high liquid water content. To resolve these problems, we propose three improvements to NIR photometry: using three calibration targets ranging from high Ref to low Ref in coverage; establishing an estimation formula for SSA from measured Ref, including lower Ref values; and considering how water in the snow influences Ref.
言語 en
書誌情報 en : BULLETIN OF GLACIOLOGICAL RESEARCH

巻 32, 号 0, p. 55-64, 発行日 2014
出版者
言語 en
出版者 NIHON SEPPYO GAKKAI-JAPANESE SOC SNOW & ICE
ISSN
収録物識別子タイプ EISSN
収録物識別子 1884-8044
DOI
関連識別子 10.5331/bgr.32.55
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