田辺湾における流れの長期連続観測

Abstract

A series of long-term observations of currents has been carried out at the Tower Station, Shirahama Oceanographic Observatory to find dynamical behaviour of coastal water in TanabeBay. During the observations, an ultra-sonic current meter has been employed successfullyto measure currents of two-components in the horizontal direction. Spectral analysis wasmade of the observed data of currents to specify representative phenomena in the long-termdata of currents. The representative phenomena are classified into four kinds in time-scale, such as long-term (seasonal, yearly and several days) variations, tides, seiches, swells and windwaves. Characteristics of each phenomenon are breifly considered. Additional observations ofcurrents in the bay were also performed to obtain the spatial distribution of tidal and residualcurrents. In the observations, water intrusion occurred from the offshore waters to the bay.