Study of internal tides in Nomi Bay [Japan], 1: Observations and theoretical consideration
1992
Hagino, S.(National Research Inst. of Fisheries Engineering, Kashima, Ibaraki (Japan))
The tidal currents associated with temperature and salinity fluctuations have been observed at Nomi Bay. The period of internal tides is close to the natural period in the bay, causing the resonance. It is indicated that the vertical displacement of the transition layer by resonance is larger than that of the sea surface. The horizontal tidal flow of the upper layer is approximately opposite to the flow of the lower layer. Those phenomena showed that internal tides are predominant in the bay. The sea water exchange is dominantly affected by the resonance of internal tide. The exchange ratio is much larger than weakly stratified bays. Especially, the resonance of internal tide plays a crucial role in making the culture of young yellowtails, etc, a possibility. The behaviors of the internal tides are examined analytically by a two-layer linear model. It is estimated that resonance of internal tide occurrs at Nomi Bay. The displacement of the interface and the velocities of upper and lower layers are calculated. These estimated values are verified by the observed values at Nomi Bay.
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