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Key Words : fishway design ,evaluation of fishway, siphon ,migration, habitat, field observation
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225p., 1995.
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pp.104- 115 2010.
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155p., 2005 7)
41 pp.51-58 2011.
8) Yukio OTA Nobuyoshi AKASHI et.al Design of Si- phon System Pipe-type Fishway and Installation in Indone-
sia vol.42 pp.75-82 2011.
EVALUATION OF FISHWAY AND DEVELOPMENT OF THE SIPHON-PIPE TYPE FISH PASSAGE
WITH MONITORING OF ASCENDING INDIGENOUS FISH Kiyoshi WADA, Takuya FUJII, Shigeru TERAMACHI, Yukio OTA
and Yosuke MABUCHI
In this study, the function of fishway was evaluated using preliminary data, the siphon-pipe type fish pas- sage with cost performance and portability has been developed, and local river experiment with indigenous fish was conducted. The structure form that the flow velocity should be reduced below at the burst swimming speed of fishes was examined. As results, dissipative energy can be attenuated greatly by the form loss of joints. The calculation formula of the design flow velocity and the required number of joint was proposed.
The siphon-pipe for fish was designed using this formula, and the amount of ascension of the indigenous fish by local river experiment was investigated. Although the complete range of the fishes used for the experi- ment permeated into the pipe, the Oikawa (Zacco platypus) ascended to exit of the fish passege for a short time, and it is the whole dominant species. This fish passage can be used for choosing fishes, as the prede- termined flow velocity is changed. It was shown that the ascension difficulty of fishes is canceled by installa- tion of the siphon-pipe type fish passage. Therefore, siphon-pipe fish passage is effective in improving the river ecological habitat.
（2014. 7.11 受付）