A structure built across a river to prevent floodwaters from flowing back into a tributary, or to prevent high tides and tsunamis from running up the river. There are backflow prevention gates installed in tributaries to prevent floodwaters from the main river from flowing back into the tributary, and flood gates installed near the river's mouth to prevent high tides and tsunamis from running up the river. Floodgates are equipped with gates. The gates of a floodgate are normally left open, and are fully closed in the event of flooding, a high tide, or a tsunami. A pumping station may be installed to drain tributary water into the main river and river water into the sea when the gates are fully closed. The Thames Barrier (completed in 1984) on the River Thames in the UK is a flood gate to protect London from high tides. [Noboru Ikawa] This water gate is located at the junction of the main Arakawa River (foreground of the photo) and the tributary Sumida River. It was built in 1924 (Taisho 13) under the guidance of Sakano Yutaka, who worked on the construction of the Panama Canal. In 1982 (Showa 57), a new water gate was completed downstream and this water gate ceased its role, but it is still affectionately known as the "Red Water Gate." Kita-ku, Tokyo ©Yutaka Sakano "> Iwabuchi Water Gate Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
洪水の支川への逆流や高潮、津波の河川への遡上(そじょう)を阻止するために河川を横断してつくられる構造物。本川の洪水が支川に逆流するのを防止するために支川に設置される逆流防止水門、高潮・津波が河川を遡上するのを防止するために河口付近に設置される防潮水門がある。水門にはゲートが備えられる。水門のゲートは平常時は開けておき、洪水時、高潮発生時、津波襲来時に全閉する。ゲート全閉時に支川の水を本川に、河川の水を海に排水するために排水機場を設置することがある。イギリス・テムズ川のテムズバリア(1984年完成)はロンドンを高潮から守るための防潮水門である。 [鮏川 登] 本流の荒川(写真手前)と支流の隅田川の分岐点にある水門。パナマ運河建設に従事した青山士の指導により、1924年(大正13)に建設された。1982年(昭和57)、下流に新しい水門が完成し、その役目を終えたが、現在も「赤水門」の名で親しまれている。東京都北区©Yutaka Sakano"> 岩淵水門 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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