紡錘状せんの落下姿勢の安定性に影響する因子について

• 梶川 正弘

  秋田大学教育学部

書誌事項

タイトル別名

• Factors affecting the stability of fall attitude of cone-like graupel.
• ボウスイジョウ アラレ ノ ラッカ シセイ ノ アンテイセイ ニ エイキョウス

抄録

To examine the effects of heterogeneity of internal density affecting the stability of fall attitude of cone-like graupel, densities of apex part and base part were measured for eight snowfalls.In addition, the relation between apex angle and tumbling motion of cone-like graupel was reanalysed on the data of free-fall attitude.When the bulk density is less than about 0.3 g·cm^-3, the density difference between the apex part and the base part is small, and the apex angle θ, affects the tumbling motion.When θ>θ^*, the cone-like graupel falls with perfect tumble(complete apex downward), and when θ<θ^* the graupel falls with imperfect tumble(incomplete apex downward).Here, θ^* is defined with the following(Jayaweera and Mason, 1965), θ^*=0.68 h/r+π/4, where h is the height of base convex and r the radius of the base.<BR>When the bulk density is larger than about 0.3 g·cm^-3, the density of base part is considerably larger than that of apex part, thus the fall attitude may be stabililzed and perfect tumbles may be lessened.It is suggested that the possibility of growth of cone-like graupel to about 1 cm in size or the cone-like hailstones.

収録刊行物

• 雪氷

  雪氷 58 (3), 223-228, 1996

  公益社団法人 日本雪氷学会

キーワード

• 霰
• 紡錘状霰
• 落下姿勢

詳細情報

• CRID: 1390001206461954304
• NII論文ID: 10002382293
• NII書誌ID: AN00131221
• DOI: 10.5331/seppyo.58.223
• ISSN: 18836267
• ISSN: 03731006
• NDL書誌ID: 3965703
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3965703
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可