EXPERIMENTAL STUDY ON TURBULENCE AND SEDIMENT TRANSPORT IN THE VICINITY OF RIVERBED USING PIV MEASUREMENT

• SEKINE Masato

  早稲田大学理工学術院

• NAKAMA Ryota

  早稲田大学大学院 創造理工学研究科 建設工学専攻

• WASHIZU Aki

  早稲田大学大学院 創造理工学研究科 建設工学専攻

Bibliographic Information

Other Title

• PIV解析を用いた河床付近で生じる乱れの構造と流砂現象に関する実験的検討

Abstract

 In this study, a riverbed with exposed large gravel that does not move due to water flow and a flat riverbed without boulders were reproduced in an open channel. PIV analysis was performed on each riverbed condition, and the structure of the turbulence was investigated. As a result, it was confirmed that vortex is generated behind the boulders of the riverbed where the boulders are exposed, and stronger turbulence is generated in the void space among the boulders than in the flat riverbed. In addition, it was suggested that the turbulence structure depending on the presence or absence of exposed boulders causes a difference in the structure of vertical sorting. Furthermore, the motion of a suspended load taken by a high-speed camera and the PIV analysis result at the same time were superimposed. It was confirmed that the motion of the particles changed due to the influence of the surrounding fluid motion with a slight delay by the experimental video.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 77 (2), I_691-I_696, 2021

  Japan Society of Civil Engineers

Keywords

• PIV
• turbulence
• sediment transport
• hiding effect
• vortex

Details

• CRID: 1390572590015177984
• NII Article ID: 130008160192
• DOI: 10.2208/jscejhe.77.2_i_691
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/77/2/77_I_691/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed