ON CHANNEL BIFURCATION

• IZUMI Norihiro

  東北大学大学院工学研究科土木工学専攻

Bibliographic Information

Other Title

• 水路の分岐現象について

Abstract

Channels are commonly observed to develope upstream due to the concentration of flow and the resultant intensification of erosion around their channel heads. In the developing process, a channel head sometimes splits into two or more than two branches. By repeating such bifurcation, simple patterns of channels evolve into comlex patterns of channel networks. In this study, a mathematical model of channel bifurcation is presented in terms of the secondary instability of a channel head. Linear stability analysis is performed to study the instability of a hole in a horizontal plane imitating a channel head. It is found that a channel head becomes unstable for perturbation and chanel bifurcation is initiated when the critical depth divided by the friction coefficient is reduced compared with the channel radius.

Journal

• PROCEEDINGS OF HYDRAULIC ENGINEERING

  PROCEEDINGS OF HYDRAULIC ENGINEERING 49 979-984, 2005

  Japan Society of Civil Engineers

Keywords

• channellization
• gully
• channel head
• channel bifurcation
• secondary instability

Details

• CRID: 1390282680146320384
• NII Article ID: 130003842258
• DOI: 10.2208/prohe.49.979
• ISSN: 18849172
• ISSN: 09167374
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed