海洋の大規模渦が沿岸水の水理的挙動に及ぼす影響

抄録

Large scaled eddies in Pacific coastal area along Honshu island in Japan were looked into through analysis of Landsat data with taking account of measurement results of water temperature and salinity as well as velocity of currents and then analyzed theoretically the fluid dynamic features such as circulation and spin-down time to sight the effects on the behaviour of effluence from the land. The off Tohoku district and the off Kii peninsula are selected as the subjects of the study. Analysis of Landsat data in the off Tohoku reveals that the water moving offshore terminates in anticlockwise eddies with the diameters of about 30km, life of which are estimated to be more than several months. In the off Kii peninsula, two definite fronts, one of which originates around Shingu and running southward and the other along Kuroshio. At the their intersection, a large eddy may be produced. These eddies will maintain the coastal water mass for quite period.