EFFECT OF LOCATION OF NOTCH ON MIGRATION RATE IN POOL-AND-WEIR FISHWAY

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Other Title
  • 階段式魚道における切り欠き位置が魚の遡上率に及ぼす影響

Abstract

Fishways have been constructed to facilitate migration of fish at dams, waterfalls and rapids. Although a lot of types of fishway are suggested, most of the fishways installed in Japanese rivers belong to the pool-and-weir type. Several values such as a water level difference between the upstream and downstream, the ratio between the flow depth and streamwise pool length, the shape of the weir and so on have an influence on the suitability of migration. In particular, Nakamura pointed out that the suitability of migration is greatly affected by the location of notch. However, this indication is not verified quantitatively. In this study, the trajectories of the migrating fish were recorded with two sets of digital video cameras and also velocity measurements were conducted in the pool-and-weir fishway with alternate notch and also with one-sided notch. It was found that the trajectories are different between alternate notch case and one-sided notch case. This is because the velocity and its direction in the pool is different from each other.

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Details 詳細情報について

  • CRID
    1390282680147675776
  • NII Article ID
    130003842398
  • DOI
    10.2208/prohe.51.1279
  • ISSN
    18849172
    09167374
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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