Investigation of methods for measuring specific surface area of wet snow
Project/Area Number |
26560195
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Natural disaster / Disaster prevention science
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Research Institution | National Research Institute for Earth Science and Disaster Prevention |
Principal Investigator |
Yamaguchi Satoru 国立研究開発法人防災科学技術研究所, 観測・予測研究領域 雪氷防災研究センター, 主任研究員 (70425510)
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Co-Investigator(Kenkyū-buntansha) |
HACHIKUBO AKIHIRO 北見工業大学, 環境・エネルギー研究推進センター, 教授 (50312450)
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Co-Investigator(Renkei-kenkyūsha) |
TANIKAWA TOMONORI 気象庁気象研究所, 気候研究部, 研究官 (20509989)
TAKEUCHI Yukari 国立研究開発法人森林総合研究所, 気象環境研究領域, チーム長 (90353755)
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Project Period (FY) |
2014-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 湿雪 / 比表面積 / 近赤外域の反射率 / ガス吸着法 / 近赤外 / 反射率 / 含水率 / 積雪 / 濡れ雪 |
Outline of Final Research Achievements |
The specific surface area (SSA) of snow is defined as its surface area per unit mass or volume. Because the SSA of snow includes information relating to the grain type, grain size, and connections among grains, it is a powerful parameter for quantifying the exchange of matter and energy between the snow and the atmosphere. Additionally, it is also an essential parameter for modeling mass transfer (air or water) in snow cover. Several methods are available to measure the SSA of snow, but they have only been applied to dry snow. In this study, we investigated the methods to measuring wet snow SSA using the linking multi-wavelengths with the difference in light absorption between ice and water. Our results indicated that the near-infrared reflectance (NIR) of snow strongly depends on its water content (θ) and the dependency of NIR on θ chages with its wavelength. These results suggest the potential that wet snow SSA can be measured using the sources of multi-wavelength.
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Report
(3 results)
Research Products
(13 results)
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[Presentation] Specific surface area of new snow2015
Author(s)
Yamaguchi, S., M. Ishizaka, H. Motoyoshi, K. Nakamura, A. Hachikubo
Organizer
International Symposium on snow and avalanche in Niseko
Place of Presentation
ニセコ町民センター(北海道ニセコ町)
Year and Date
2015-12-10 – 2015-12-12
Related Report
Int'l Joint Research
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[Presentation] ガス吸着式積雪比表面積測定装置の改良2015
Author(s)
八久保晶弘, 山口悟, 堀雅裕, 谷川朋範, 杉浦幸之助, 的場澄人, 庭野匡思, 朽木勝幸, 青木輝夫
Organizer
雪氷研究大会2015・松本
Place of Presentation
信州大学(長野県松本市)
Year and Date
2015-09-14 – 2015-09-16
Related Report
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[Presentation] 新雪の比表面積と降雪種の関係 (2)2015
Author(s)
山口悟, 石坂雅昭, 本吉弘岐, 八久保晶弘, 青木輝夫
Organizer
2015年度 (公社)日本雪氷学会 北信越支部大会
Place of Presentation
信州大学(長野県松本市)
Year and Date
2015-06-06 – 2015-06-06
Related Report
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[Presentation] 野外におけるガス吸着式積雪SSA測定装置の運用2015
Author(s)
八久保晶弘, 山口悟, 堀雅裕, 谷川朋範, 杉浦幸之助, 的場澄人, 庭野匡思, 朽木勝幸, 青木輝夫
Organizer
日本雪氷学会北海道支部研究発表会
Place of Presentation
北海道大学(北海道札幌市)
Year and Date
2015-05-15 – 2015-05-16
Related Report
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[Presentation] 降雪種と比表面積との関係2014
Author(s)
山口悟・石坂雅昭・本吉弘岐・八久保晶弘・青木輝夫
Organizer
日本気象学会2014年度秋季大会
Place of Presentation
福岡国際会議場(福岡県福岡市)
Year and Date
2014-10-21 – 2014-10-23
Related Report
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[Presentation] 積雪比表面積計測手法の比較2014
Author(s)
安達聖・中村一樹・山口悟・阿部修
Organizer
雪氷研究大会(2014・八戸)
Place of Presentation
八戸工業大学(青森県八戸市)
Year and Date
2014-09-20 – 2014-09-23
Related Report
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