...When the area between two or more natural levee-like protrusions is filled in and becomes land, the coastline becomes an arc with a series of river mouths. This type of delta is called an arc-shaped delta, and typical examples are the Nile River delta and the Niger River delta. In Japan, examples of arc-shaped deltas include the Tama River and the Obitsu River that flow into Tokyo Bay, and the delta of the Iwaki River (Aomori Prefecture) before it was reclaimed. *Some of the terminology explanations that refer to "arc delta" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また二つ以上の自然堤防状突出部の間が埋積されて陸化すると,海岸線は河口を連ねた円弧状となる。このような三角州は円弧状三角州とよばれ,ナイル川三角州やニジェール川三角州にその典型をみる。日本でも,東京湾に注ぐ多摩川や小櫃川,干拓以前の岩木川(青森県)の三角州などが円弧状三角州の例としてあげられる。… ※「円弧状三角州」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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