河床上昇・低下に伴う河床勾配の時間変化を考慮した砂州の線形安定解析

• 高畑 知明

  北海道大学大学院工学院

• 泉 典洋

  北海道大学工学研究院

書誌事項

タイトル別名

• Linear stability analysis of fluvial bars considering the time variation of bed slopes with aggradation and degradation

抄録

Bed slope changes due to bed aggradation/degradation caused by an increase/decrease of sediment supply. Though we have performed a linear stability analysis of sand bars incorporating effects of bed aggradation/degradation, the analysis has assumed bed elevation changes without changing its shape, and temporal variation of bed slope has not been taken into account. In order to study bar instability with temporal variation of bed slope, the WKB method is applied with the use of the rate of bed slope changes as a small parameter. The analysis shows that, unstable regions in the instability diagram is expanded to the range of large wavenumbers when bed slope decreases while unstable regions are reduced when bed slope increases.

収録刊行物

• 土木学会論文集Ａ２（応用力学）

  土木学会論文集Ａ２（応用力学） 67 (2), I_661-I_669, 2011

  公益社団法人 土木学会

キーワード

• linear stability analysis
• sand bars
• change of bed slope
• WKB method

詳細情報

• CRID: 1390001205351304320
• NII論文ID: 130004557210
• DOI: 10.2208/jscejam.67.i_661
• ISSN: 21854661
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可