著者
堀 和明 斎藤 文紀
出版者
公益社団法人 東京地学協会
雑誌
地学雑誌 (ISSN:0022135X)
巻号頁・発行日
vol.112, no.3, pp.337-359, 2003-06-25 (Released:2009-11-12)
参考文献数
141
被引用文献数
6 or 0

Large rivers with high sediment discharge, such as the Amazon, Ganges-Brahmaputra, and Huanghe (Yellow) rivers, have formed mega-deltas at their mouths. This paper reviews morphology and sediments of mega-deltas and their Holocene evolution in relation to sea-level changes, channel avulsion, and past-sediment discharge. Application of various radiometric dating techniques to delta deposits, especially since the 1980's has made it possible to clarify delta evolution dynamically on 10-to 1000-year time scales. Most of the deltas are located in developing countries, and have environmental problems principally caused by human activities. For the evaluation of current status and human activities in deltas and drainage basins, both natural and anthropogenic changes of deltas should be analyzed from the viewpoints of geology, sedimentology, and their evolution.

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インドへの中継点の上海に到着。着陸前の飛行機から、長江の三角州の海底部のうち、河口から数十キロ沖合の水深が急変する部分がみえた。海の青色の変化や筋状の微地形が印象的だった。海底部を含む世界の三角州を日本語で解説した論文(pdf)。… https://t.co/0oGcnzFl8i

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