Morphology and Sediments of Large River Deltas

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 pas...

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Bibliographic Details
Published inChigaku zasshi Vol. 112; no. 3; pp. 337 - 359
Main Authors SAITO, Yoshiki, HORI, Kazuaki
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo Geographical Society 2003
Subjects
coastal environment
delta
Holocene
large river
sea-level change
sediment discharge
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ISSN0022-135X
1884-0884
DOI10.5026/jgeography.112.3_337

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Summary: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.
ISSN:0022-135X
1884-0884
DOI:10.5026/jgeography.112.3_337