NONLINEAR STABILITY ANALYSIS OF DUNES BY THE USE OF A SEDIMENT TRANSPORT FORMULA INCLUDING THE EFFECT OF THE PRESSURE GRADIENT

• 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土木工学専攻

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型安定解析

Abstract

In order to enable accurate predictions of the bedform change in rivers, the accurate estimation of the sediment transport rate is important. In this study, we propose a bedload formula taking into account 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 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 transition is charactrized by subcritical bifurcation even if the effect of the local bed inclination is large.

Journal

• PROCEEDINGS OF HYDRAULIC ENGINEERING

  PROCEEDINGS OF HYDRAULIC ENGINEERING 49 937-942, 2005

  Japan Society of Civil Engineers

Keywords

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

Details

• CRID: 1390282680146324736
• NII Article ID: 130003842250
• DOI: 10.2208/prohe.49.937
• ISSN: 18849172
• ISSN: 09167374
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed