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Numerical simulation of snow saltation and suspension in a turbulent boundary layer
https://nied-repo.bosai.go.jp/records/4482
https://nied-repo.bosai.go.jp/records/448242e8fc5d-aeba-4d6f-903e-1fa658217a3b
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 | Numerical simulation of snow saltation and suspension in a turbulent boundary layer | |||||||||
言語 | ||||||||||
言語 | eng | |||||||||
著者 |
M Nemoto
× M Nemoto
× K Nishimura
|
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抄録 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | [ 1] A new numerical model was developed to describe the development of drifting snow on a flat surface. The model uses Lagrangian stochastic theory to account for turbulence effects on the suspension of snow grains, and also includes aerodynamic entrainment, the grain-bed collision process, wind modification by the grains, and a distribution of grain sizes. The calculated wind profile, shear stress, and mass flux near the surface agreed quantitatively with previous wind tunnel experiments. Because of turbulence, snow grains can reach 10 m high, a results that agrees with recent measurements but had not previously been simulated using saltation models. We also found that the steady state fluid shear stress exceeded the threshold stress, meaning that the grains were continually entrained by the fluid. A distinct change in the mass flux profile occurred at 0.1 m high for the following reason. Below 0.1 m, the particle inertia dominated the grain motion and turbulence had only a small effect on the motion; in contrast, above 0.1 m, most particles were less than 100 mm in diameter and their motion was mainly affected by the turbulence and not inertia. That is, the particles above 0.1 m were in suspension mode. | |||||||||
言語 | en | |||||||||
書誌情報 |
en : JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 巻 109, 号 D18, p. doi:10.1029 |
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出版者 | ||||||||||
言語 | en | |||||||||
出版者 | AMER GEOPHYSICAL UNION | |||||||||
ISSN | ||||||||||
収録物識別子タイプ | EISSN | |||||||||
収録物識別子 | 2169-8996 | |||||||||
DOI | ||||||||||
関連識別子 | 10.1029/2004JD004657 |