多種のバーティカルスロット式魚道の数値流動解析とプールを構成する各隔壁の機能について Numerical Investigation of Flow in Various Types of Vertical Slot Fishways and the Function of Baffles

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Abstract

12種類のバーティカルスロット式魚道における水理構造を数値モデルにより計算し,プールを構成する各隔壁の流れに与える影響を検討した.採用した数値モデルは,四分木格子上で有限体積法に基づいて離散化されたモデルである.対象魚道は9個のプール(幅:2.0m,長さ:2.2m)から構成され,スロット幅は0.25m,底面勾配は1/20である.得られた結果より,突出し壁は蛇行を促進させることで最大流速を抑える効果があり,導流壁は蛇行を抑制して滞留域を確保する機能のあることが示された.

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.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 49(2), 85-92, 2012

    The Japanese Society of Fisheries Engineering

References:  11

Codes

  • NII Article ID (NAID)
    110009586178
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    0916-7617
  • NDL Article ID
    024206241
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE  JASI 
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