Weakly nonlinear stability analysis of dunes by the use of a sediment transport formula including the effect of the pressure gradient

• Satoh Hiroshige

  Graduate School of Engineering Hokkaido University

• Izumi Norihiro

  Graduate School of Engineering Hokkaido University

Bibliographic Information

Other Title

• 圧力勾配を考慮した流砂量式によるデューンの弱非線形安定解析

Abstract

In order to obtain the accurate predictions of the bedform change in rivers, the accurate estimation of the sediment transport rate is important. In this study, we proposed a bedload formula, considering the effect of the pressure gradient in flow caused by the formation of dunes on the basis of Kovacs' & Parker's formula including the effect of the local bed inclination. We performed a weakly nonlinear stability analysis by the use of the sediment transport formula derived in this study. It is found that the transition between dune-covered and flat bed is charactrized by subcritical bifurcation and the results can be explained by the experimental results.

Journal

• NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan

  NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 57 (0), 144-144, 2008

  National Committee for IUTAM

Keywords

• dunes
• bedload transport
• local bed inclination
• pressure gradient
• weakly nonlinear stability analysis

Details

• CRID: 1390001205591808256
• NII Article ID: 130004603934
• DOI: 10.11345/japannctam.57.0.144.0
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed