INTERNAL VELOCITY FIELD OF DAM-BREAK FLOWS ON DRY BED AND ESTIMATION OF BED SHEAR STRESS USING SPACE-TIME AVERAGE

• MIZUTANI Natsuki

  大阪産業大学 工学部都市創造工学科

Bibliographic Information

Other Title

• ドライベッド上を進む段波の内部流速場と時空間平均によるせん断応力の評価について
• ドライベッド ジョウ オ ススム ダンパ ノ ナイブ リュウソクジョウ ト ジクウカン ヘイキン ニ ヨル センダンオウリョク ノ ヒョウカ ニ ツイテ

Abstract

 In this study, the internal velocity field of dam-break flows on a dry bed was investigated, to estimate bed shear stress using the space-time average. The wave number spectrum of velocity fields at the same height was calculated from the PIV results. The width for spatial average was decided based on the peak wave number to calculate the vertical profiles of mean horizontal velocity and Reynolds stress. The profiles indicated that layers under y = 2 mm strongly affected by the bottom friction. The bed shear stress calculated from the friction velocity was of the same order as that obtained from the Manning formula, but indicated larger fluctuations with time variation. Further, it was indicated that bed shear stress caused by friction velocity was related to the local water surface slope.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75 (2), I_7-I_12, 2019

  Japan Society of Civil Engineers

Keywords

• bed shear stress
• dry bed
• dam break flow
• friction velocity
• turbulent structure

Details

• CRID: 1390001277369667840
• NII Article ID: 40022083597
• NII Article ID: 130007730325
• DOI: 10.2208/kaigan.75.i_7
• ISSN: 18838944
• ISSN: 18842399
• NDL BIB ID: 030109602
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030109602
• Web Site: https://www.jstage.jst.go.jp/article/kaigan/75/2/75_I_7/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed