... In terms of structure, dams can be divided into movable dams, which are made up of movable structures such as gates (sluice gates) for releasing stored water, and fixed dams, where the main parts of the dam body cannot be moved, but most dams are fixed dams. Of the fixed dams, those that are designed to allow water to overflow by attaching a gate to the top of the dam are called overflow dams, and those that are not designed to allow water to overflow are called non-overflow dams. In terms of materials, there are concrete dams made of concrete, and fill dams made of earth, gravel, and rock (a general term for earth dams and rockfill dams.)... *Some of the terms used in reference to "overflow dams" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 構造面からは,ダムの大部分が貯水を放流するためのゲート(水門扉)のように動かしうる構造物で占められる可動ダムと,ダム本体の主要部分が動かすことのできない固定ダムとに分けられるが,ほとんどのダムが固定ダムである。固定ダムのうち,堤頂にゲートを取り付けたりして水を越流させるようになっているものを越流ダム,越流させるように設計されていないものを非越流ダムという。 材料面からは,コンクリートでつくられたコンクリートダム,土,砂れき,ロックからなるフィルダム(アースダムとロックフィルダムの総称。… ※「越流ダム」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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