Influence on Fish Ascent Rate of Designs and Numbers of Weirs for Sloped Weir Fishways with V-shaped Notches

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  • Ichion Eiji
    Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University
  • Nakano Mitsunori
    Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University
  • Tanaka Kenji
    Civil Engineering Research Institute for Cold Region
  • Chono Shunsuke
    Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University
  • Fujihara Yoichi
    Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University

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Other Title
  • V字ノッチ傾斜隔壁魚道の隔壁形状と枚数が魚類の遡上率に与える影響
  • Vジ ノッチ ケイシャ カクヘキ ギョドウ ノ カクヘキ ケイジョウ ト マイスウ ガ ギョルイ ノ ソジョウリツ ニ アタエル エイキョウ

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Abstract

<p>  This study aimed to clarify the influence on fish ascent rate of designs and numbers of sloped weirs with V-shaped notches. Experiments were carried out using three types of sloped weir designs with V-shaped notches, with and without orifices. Experiments to compare the effect of the number of weirs were carried out using a further three types of top-sloped weir with V-shaped notches, with and without orifices. Oryzias spp., Carassius spp., and Misgurnus auguillicaudatus were tested in both the experiments. Experiments comparing the designs of weirs suggested that the orifices decreased the ascent rates of Carassius spp. and increased the ascent rate of Misgurnus auguillicaudatus; however, Oryzias spp. was not observed to ascend. Concerning the ascent rates of Carassius spp. and Misgurnus auguillicaudatus, there were no significant differences between the fully-sloped weir and the top-sloped weir. In the experiments comparing the number of weirs, we obtained similar approximate expressions between the number of weirs and normalized indices for ascent rates of Carassius spp. and Misgurnus auguillicaudatus for all weir types. However, Oryzias spp. was not observed to ascend, as was the case in the experiments using the sloped-weir designs.</p>

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