EFFECTS OF SEDIMENT SUPPLY AND GRAIN SORTING ON LOW-WATERCOURSE FORMATION IN CHANNEL WITH ALTERNATE BARS

• MIWA Hiroshi

  舞鶴工業高等専門学校建設システム工学科

• DAIDO Atsuyuki

  東アジア技術事務所

• YOKOGAWA Jun

  伊根町役場農林水産課

Bibliographic Information

Other Title

• 交互砂州河床における水みちの形成過程に及ぼす土砂供給と砂礫の分級の影響

Abstract

Effects of sediment supply and grain sorting on the formation process of low-watercourse in a straight channel with alternate bars are investigated by means of flume tests using uniform and non-uniform sediment. Results are summarized as follows:(1) The low-watercourse is shallow and unstable when the bed level does not vary by sediment supply, whereas the deep and stable low-watercourse is formed when the bed degradation progresses by no sediment supply.(2) The emerged bars in the non-uniform sediment bed are formed with grain sorting, and their upper and lower part mainly consists of coarse grains and fine grains, respectively. These emerged bars are more stable than those in the uniform sediment bed, and contribute to the stability of the low-watercourse.(3) The meandering wavelength of the low-watercourse increases considerably with progression of the bed degradation, and is about 2-3 times the mean wavelength of the alternate bars.

Journal

• PROCEEDINGS OF HYDRAULIC ENGINEERING

  PROCEEDINGS OF HYDRAULIC ENGINEERING 49 949-954, 2005

  Japan Society of Civil Engineers

Keywords

• alternate bars
• low-watercourse
• emerged bar
• riverbed degradation
• sediment supply
• non-uniform sediment
• grain sorting

Details

• CRID: 1390001205169627520
• NII Article ID: 130003842252
• DOI: 10.2208/prohe.49.949
• ISSN: 18849172
• ISSN: 09167374
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed