CHARACTERRISTICS OF YEAR TO YEAR CHANGE OF TIDES AND TIDAL CURRENT IN ARIAKE SEA AND ISAHAYA BAY

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  • 有明海・諫早湾の潮汐・潮流の経年変化特性

Abstract

<p> The long-term characteristics of the tides in the Ariake Sea and the data of nine years of continuous multi-point observations of current velocities in Isahaya Bay, which have been carried out by this research group, were reviewed and analysed with a focus on the changes. The results showed that the M2 tidal amplitude has continued to decrease since the 2000s, and that the current tidal current velocity caused by the incoming and outgoing tides is at its lowest in the present Ariake Sea, when considered together with the decrease in the bay area due to past reclamation, the 18.6-year cycle variation of tides and the rise in mean sea level. Analysis of long-term continuous tidal current observation data for nine years, about half of the 18.6-year cycle in Isahaya Bay, showed that there was no perfect correspondence with tidal changes, suggesting the influence of density stratification and other factors.</p>

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