Study of internal tides in Nomi Bay [Japan], 2: Numerical experiments and application to the improvement of seawater quality
1992
Hagino, S.(National Research Inst. of Fisheries Engineering, Kashima, Ibaraki (Japan))
The oceanographical conditions due to internal tides which have been observed at Nomi Bay are examined by a numerical experiment with a two-layer stratified flow model. When the fluctuations of surface tide and the interface are given with the inversion phase at the mouth of Susaki Bay, the internal tides are amplified and the stratified flows are formed. The computed values are consistent with the observed values of current velocities and the amplitude of the internal tides. It is indicated that the amplification of the internal tides at Nomi Bay is considered to be due to the resonance phenomenon and is closely related to the local bottom topography. A method for the improvement of water quality in area such as a mariculture ground where the internal waves intrude into a shelf is discussed. The effectiveness of the enhanced sea water exchange by density current ditch is examined by a hydraulic experimental model. The effectiveness is estimated to be stronger when the thickness of lower layer is thinner and the bottom friction stress is larger.
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