上五島・有福湾に設置された潮通し水路の海水交換機能

概要

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The Arifuku Bay located in the middle part of Gotoh Islands in Nagasaki Prefecture has been enclosed by two dikes for the roadway since 1975. In recent years, the red tide often occurs in this bay. Municipality constructed a tidal flume at Feb. 2008 to promote the seawater exchange in this bay as countermeasure against the red tide. This study deals with the field observations on tidal currents in the flume and the tidal levels, the numerical simulations for prediction of flow change and seawater exchange to accompany the construction of a new tidal flume.