EFFECTS OF NOTCH RATIO IN POOL-AND-WEIR FISHWAY ON MIGRATION RATE

• ONITSUKA Kouki

  九州工業大学

• AKIYAMA Juichiro

  九州工業大学

• IIGUNI Yohei

  九州工業大学大学院

• MORI Yusuke

  九州工業大学

Bibliographic Information

Other Title

• 階段式魚道における隔壁の切り欠き率が遡上率に及ぼす影響

Abstract

Most of fishways constructed beside of weirs and dams in Japanese rivers belong to pool-and-weir type. Usually, a notch is placed at the weir. Ministry of Land, Infrastructure and Transport recommends that the ratio between the notch width and fishway one set to in the range between 0.17 and 0.20 without any verification. In this study, the notch ratio in a pool-and-weir fishway was changed in the range between 0.1 and 0.7 and migration rates of ayu, Plecoglossus altivelis altivelis, were obtained with the aid of two sets of digital video cameras. Further, three components velocities were measured with a 3-D electromagnetic current meter. It was found that the migration rate changes with respect to the discharge, the migration rate increases with a decrease of the notch ratio and also that the most of migration positions over the weir are located near the side-wall. Those characteristics concern with the flow velocity and orientation area. The position of the orientation area concerns with the flow velocity.

Journal

• PROCEEDINGS OF HYDRAULIC ENGINEERING

  PROCEEDINGS OF HYDRAULIC ENGINEERING 52 1201-1206, 2008

  Japan Society of Civil Engineers

Keywords

• pool-and-weir fishway
• notch ratio
• discharge
• orientation
• migration

Details

• CRID: 1390282680148967936
• NII Article ID: 130004043959
• DOI: 10.2208/prohe.52.1201
• ISSN: 18849172
• ISSN: 09167374
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed