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  1. 防災科研関係論文

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/4482
42e8fc5d-aeba-4d6f-903e-1fa658217a3b
Item type researchmap(1)
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

en M Nemoto

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K Nishimura

× K Nishimura

en 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
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
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