日本沿岸における礫質砂州の離水量

概要

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Coastal barriers, which are composed of sand and/or gravel, run parallel to the mainland coast but are separated from it by lagoons. There are also cases in which these lagoons became coastal lowlands or abandoned lagoons by deposition of sediment. The top of these barriers have been considered to be emergence bodies by sea level lowering or uplift. The relative height between the upper limit of the backshore (coinciding with the upper limit of the swash of storm waves at present sea level) and the crest of barriers (coinciding with the upper limit of backshore at high sea level), RH, should represent the amount of emergence. This report shows the data on RH obtained from four gravel barriers in Japan which have no sand dunes above their top, i.e., Senbon-Matsubara, Shizuoka Prefecture; Shichiri-Mihama, Mie Prefecture; Amano-Hashidate, Kyoto Prefecture; Nagameno-Hama, Kami-Koshiki Island, Kagoshima Prefecture. These barriers each have different RH values, but RH values remain consistent along each barrier. The mean value of RH is 4.0m for Senbon-Matsubara, 3.2m for Shichiri-Mihama, 0.4m for Amano-Hashidate, and 0m for Nagameno-Hama, respectively.
2009-04-25