Elevator fishway - Elevator fishway

Japanese: エレベーター式魚道 - えれべーたーしきぎょどう
Elevator fishway - Elevator fishway

...A passageway that allows fish such as salmon, trout, sweetfish, and eels to pass through when their passage is blocked by obstacles such as dams. Fishways are built in various structures depending on the type of fish and the terrain. (1) Waterway type: A gently sloping waterway is added to the waterway, and some are designed to widen the waterway in places to create pools or to set up pillars along the way to make the flow even gentler. (2) Guide wall type: A guide wall is extended from one or both sides of the waterway to make the flow gentler, and is further divided into various types depending on the shape, spacing, and protruding angle of the guide wall. ...

*Some of the terminology used to refer to "elevator fishway" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…サケ・マス類,アユ,ウナギなど河川を上り下りする習性をもつ魚の通行が,ダムなどの障害物によって妨げられる場合に,これらの魚が往来できるように設けられる通路。 魚道は魚の種類や地形に応じて,いろいろの構造のものが造られている。(1)水路式 傾斜の緩い水路を付設するもので,水路の所々を広げてプールを造ったり,途中に柱を立てて流れをさらに緩やかにする工夫のされたものもある。(2)導壁式 水路の片側あるいは両側から導壁を張り出して流れを緩やかにするもので,導壁の形,間隔,突出角度などによってさらにいろいろの形式に分けられる。…

※「エレベーター式魚道」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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