Parachute gravels on the gravel beaches of the Tsuyazaki coast, North Kyushu

概要

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The Tsuyazaki coast of North Kyushu, western Japan, shows well-developed gravel beaches at the southern foot of the headland of Tsuyazaki. They consist mainly of basaltic pebbles to boulders, which are sorted horizontally depending on the distance from the source. Behind the gravel mound, there is a pool composed of sand-sized sediments, where gravels of outsize attached by long kelps are scattered. Such gravels are also randomly found on the nearby sand beach. The origin of gravels of outsize is due to the sailing effect of gravels with kelp-streamers under storm-agitated condition mainly during the winter season. Gravels in such an occurrence are called "parachute gravels". They are important to understand the occurrence of outsized gravels of coastal deposits.
日本堆積学会の論文