…In arid and semi-arid regions, the production of debris is active and rainfall is often heavy, which favors the development of alluvial fans. When the conditions for alluvial fan formation change due to crustal movement, climate change, or even changes in sea level, which serves as the river erosion base level, dissected alluvial fans carved by valleys and synthetic alluvial fans formed in front of alluvial fans are created. When many rivers emerge from the mountains, adjacent alluvial fans join together to form a series of alluvial fans called confluent alluvial fans. … *Some of the terminology that refers to "dissected alluvial fan" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また,乾燥地域や半乾燥地域でも岩屑の生産が活発であり,降雨は豪雨の型をとることが多いため扇状地の発達が良好である。 地殻変動や気候変化,さらには河川の浸食基準面となる海面の変動などによって,扇状地の形成条件が変化した場合には,谷によって刻まれた開析扇状地や扇状地の前面に新たな扇状地が形成された合成扇状地などがつくられる。また,山地から多数の河川が出てくるときには,隣り合う扇状地が相接して連なり,合流扇状地とよばれる一連の扇状地群をつくる。… ※「開析扇状地」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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