...It includes small basins such as Iizuka (Kaho) and Tagawa, and numerous narrow, long valley plains spread out like trees along the river system. The deltaic lowlands extending 3 to 8 km east to west and 20 km north to south downstream from Nogata are sometimes called the Onga River Plain. Based on the distribution of shell mounds, it is estimated that the river once was a seabed several dozen km from its mouth in Ashiya, and the riverbed slope of the Onga River is only 1/8000 to 1/10000. *Some of the terminology that refers to the "Onga River Plain" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…飯塚(嘉穂),田川などの小盆地を含み,水系に沿って多数の狭長な谷底平野が樹枝状に広がっている。直方から下流の東西3~8km,南北約20kmの三角州性低地をとくに遠賀川平野と呼ぶこともある。 貝塚の分布で,かつては河口の芦屋から十数kmの入海であったと推定され,遠賀川の河床傾斜も1/8000~1/10000にすぎない。… ※「遠賀川平野」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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