THE FLOW RESISTANCE AND RIVER-BED CONDITION IN THE SHALLOW RIFFLE ON GRAVEL-BED RIVERS

• HARADA Morihiro

  岐阜大学 流域圏科学研究センター

• YOSHIKAWA Atsuki

  岐阜大学大学院自然科学技術研究科環境社会基盤工学専攻

• MIWA Hiroshi

  鳥取大学 工学部社会システム土木系学科

Bibliographic Information

Other Title

• 石礫床河川の早瀬における流水抵抗と河床表層状態の関係性

Abstract

 In the riffle of a gravel-bed river with a wide grain size, sediment transport corresponding to the magnitude of the flow rate occurs. The purpose of this study is to obtain basic knowledge for sediment transport modeling in riffle under the ordinary flow rate. The six field surveys were conducted on the Nagara River, and three cases of experiments were conducted in the experimental flumes. For the observed hydraulic values, the magnitude of flow resistance, the balance between the movement limit of surface sediment mixture and the tractive force were examined. As a result, Hey's and VPE with the relative water depth as a parameter were able to evaluate the observed values of U/U^* relatively well. In the process of continuous water flow, partial sediment movement occurred and the process of coarsening the surface layer of the riverbed was observed in the flume. However, it was suggested that the balance of the actual river riffle would be unstable due to various fluctuation factors.

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_637-I_642, 2021

  Japan Society of Civil Engineers

Keywords

• flow resistance
• riffle
• riverbed environment
• gravel-bed rivers
• flume experiment

Details

• CRID: 1390572590007025280
• NII Article ID: 130008160167
• DOI: 10.2208/jscejhe.77.2_i_637
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/77/2/77_I_637/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed