THE TRANSITION BETWEEN DUNE-COVERED AND FLAT BEDS WITH ACTIVE SUSPENDED LOAD

• YAMAGUCHI Satomi

  独立行政法人 港湾空港技術研究所 海洋・水工部

• IZUMI Norihiro

  東北大学大学院工学研究科

Bibliographic Information

Other Title

• 浮遊砂を伴うデューン―平坦床遷移過程
• フユウ サ オ トモナウ デューン ヘイタンショウ センイ カテイ

Abstract

During floods, dunes formed under the condition of a low discharge disappear when the discharge becomes larger than a certain amount, and dunes are re-created with decreasing discharge. On the dune-flat bed transition, it is observed that a critical discharge from dune to flat bed regimes is larger than a discharge from flat bed to dune regimes (hysteresis). The authors have shown that the dune-flat bed transition is characterized by subcritical bifurcation that causes hysteresis with the use of a nonlinear stability analysis. However, the critical Froude number at the dune-flat bed transition predicted in the analysis is much larger than that observed in the field. In this study, we performed a weakly nonlinear analysis incorporated with suspended sediment transport. It is found that the critical Froude number decreases due to the effects of suspended load while the transition is still characterized by subcritical bifurcation.

Journal

• Doboku Gakkai Ronbunshu

  Doboku Gakkai Ronbunshu 2005 (796), 796_53-796_67, 2005

  Japan Society of Civil Engineers

Keywords

• dunes
• hysteresis
• weakly nonlinear analsys
• growth rate expansion method
• perturbation technique

Details

• CRID: 1390282680578807680
• NII Article ID: 10015604322
• NII Book ID: AN10014020
• DOI: 10.2208/jscej.2005.796_53
• ISSN: 18827187
• ISSN: 02897806
• NDL BIB ID: 7461688
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7461688
• Web Site: https://www.jstage.jst.go.jp/article/jscej/2005/796/2005_796_796_53/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed