Numerical Investigation of Flow in Various Types of Vertical Slot Fishways and the Function of Baffles

Hydraulic structure in vertical slot fishways with 12 designs is numerically investigated and the effect of baffles of the fishways on the hydraulic structure is discussed. The numerical model employed is based on the finite volume method of the shallow water flow equation discretized on quadtree gr...

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Bibliographic Details
Published inFisheries engineering (Japan)/Suisan Kogaku (Japan) Vol. 49; no. 2; pp. 85 - 92
Main Authors FUJIHARA, Masayuki, YAMANAKA, Satoshi, IZUMI, Tomoki, LAPONG, Edward
Format Journal Article
LanguageEnglish
Published The Japanese Society of Fisheries Engineering 15.11.2012
Subjects
Baffles
Finite volume method
Quadtree grids
Sargassum
Sebastes
Shallow water equation
Turbo cornutus
Vertical slot fishway
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Summary:Hydraulic structure in vertical slot fishways with 12 designs is numerically investigated and the effect of baffles of the fishways on the hydraulic structure is discussed. The numerical model employed is based on the finite volume method of the shallow water flow equation discretized on quadtree grids with a Godunov-type scheme. The vertical slot fishway models consist of 9 pools with width and length of 2.0m and 2.2m, respectively. The width of the slot at each pool is 0.25m and the bottom gradient of the fishway is 1/20. Each pool is framed by at most three types of baffles: main, short and guide baffles. Based on the numerical investigations, it is concluded that the short baffles decrease the main stream velocity by enhancing meandering of main stream and the guide baffles suppress excessive meandering to create calm recirculation areas in the pools. Hence, both kinds of baffles are indispensable for vertical slot fishways.
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ISSN:0916-7617
2189-7131
DOI:10.18903/fisheng.49.2_85