MECHANISM OF SAND SUPPLY TO LITTORAL CELL FROM CLIFFY COAST

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  • 海蝕崖の崩落土砂の漂砂系への供給メカニズム

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Sand supply from the sea cliff to the coast was investigated, taking the Byobugaura sea cliff as an example. This sea cliff with a 10km length has been retreated for a long time while supplying sand to the Kujukuri coast with a 60 km length. This sea cliff is composed of unconsolidated layers, mostly mud stone with part of sand stone. Grain size of sand supplied from the sea cliff was investigated by the sieve analysis of the samples taken from fallen rocks, as well as the shoreline materials downcoast. The silt content is as high as 42-64% in the sea cliff, but downcoast of the sea cliff, the content of fine sand increases along the coastline, suggesting that a large amount of silt is quickly lost soon after the collapse of sea cliff.

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