A shallow lake separated from the open sea by a sandbar that developed at the mouth of a bay. Also called a lagoon. Synonymous with lagoon. Many brackish lakes were originally lagoons, and they occupy a high position among Japan's large lakes. A representative example is Lake Saroma (Hokkaido), where a tidal mouth was artificially excavated in 1929 (Showa 4). Also, in Lake Hamana (Shizuoka Prefecture), the sandbar is said to have been broken by the Tokaido earthquake on September 20, 1498 (August 25, Meiō 7) and the Settsu-Kawachi earthquake on September 21, 1510 (August 8, Eishō 7). In this way, lagoons often alternate between brackish and freshwater states in their formation history. [Kazunori Mori] [References] | | |A lagoon in northeastern Hokkaido. It is the third largest lake in Japan (area 151.8 km). It is separated from the Sea of Okhotsk by a 30 km long sand spit, but because it is a brackish lake with seawater flowing in from a central opening (tidal mouth), scallops, oysters, Hokkai shrimp, sea urchins, and other creatures are cultivated there. It is included in Abashiri Quasi-National Park. Kitami City, Yubetsu Town, Monbetsu District, and Saroma Town, Tokoro District, Hokkaido ©Kitami City "> Lake Saroma Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
湾口に発達した砂州などにより外海と切り離されて生じた浅い湖。ラグーンlagoonともいう。潟(かた)と同義。汽水湖の多くが成因的には潟湖であり、日本の大きな湖のなかに占める地位は高い。代表例のサロマ湖(北海道)では、1929年(昭和4)に潮口が人工的に開削されており、また浜名湖(静岡県)では、1498年9月20日(明応(めいおう)7年8月25日)の東海道地震と1510年9月21日(永正(えいしょう)7年8月8日)の摂津(せっつ)・河内(かわち)方面の地震(1510)などによって砂州が切れたとされる。このように潟湖は、その形成史において汽水と淡水の状態を繰り返す場合が多い。 [森 和紀] [参照項目] | | |北海道北東部にある潟湖。日本で3番目に大きな湖(面積151.8km)である。延長30kmの砂嘴によってオホーツク海と隔てられるが、中央の開口部(潮口)から海水が流入する汽水湖のため、ホタテガイ、カキ、ホッカイシマエビ、ウニなどの養殖が行われている。網走国定公園に含まれる。北海道北見市・紋別郡湧別町・常呂郡佐呂間町©北見市"> サロマ湖 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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