ADCP (acoustic Doppler current profiler) measurement was carried out in Irago Suido, an entrance of Ise bay, south coast of Japan, to determine the horizontal and vertical variation of tidal phase and amplitude in the inlet. R/V Tenyo had passed through Irago Suido repeatedly for 25 hours to measure the currents. As a result, the followings are noted;
1) The lower-layer velocity leads surface velocity due to the effect of bottom friction on the oscillating current.
2) The velocity at the center leads the velocities on both sides, bay-side and ocean-side. This agrees with the result of a numerical model.
3) The directions of residual currents are northwestward on the bay-side and southeastward on the ocean-side.