KUMERICAL INVESTIGATIOI OF M2-TIDE II THE MEDITERRANEAN SEA WITH ITS REAL BOUIDARIKS AID OF GRID SIZE 15'1 IS' .

KUMERICAL INVESTIGATIOI OF M2-TIDE II THE MEDITERRANEAN SEA
WITH ITS REAL BOUIDARIKS AID OF GRID SIZE 15’1 IS’ .
By
G.F. SOLIMAN*, I.A. MAIYZA*, r.M. KID AND A.M. ABDALLAH,.
* lational Institute of Oceanography and Fisheries, Kayet-Bey,
Alelandria, EGYPT.
Key Words: M2-Tides, Mediterranean Sea.
ABSTRACT
The M2- co-oscillating tide has been investigated numerically in
the Mediterranean with grid resolution of IS’X 15′. The basin is cooscillating with the Atlantic through Gibraltar Strait. The observed
oscillatory movement of the water level at Gibraltar was taken to
represent the boundary condition at the opening.
The co-oscillating motions caused a change in the time of
occurrence of malimum amplitudes ( co-tidal lines) for about one to
two hours in the eastern and the western basins. The changes in the
amplitude values due to such co-oscillations are more pronounced in
the western basin than in the eastern one.
The ratios of the co-oscillating to the independent tides are
relatively higher in the western basin than in the eastern basin. A
minor influence has been observed in both Adriatic and Aegean Seas.
Generally, the results are mostly in good agreement with
observations elcept at some locations where relatively higher
amplitude values were obtained. These may be attributed to the high
energy penetrating at the opened boundary, which may be improved it
more fine grid resolution is used. The influence of shallow water
depths has been considered. In addition, the spatial distribution of
currents at different lunar times were also presented which showed the
way of elchange of water between the different basins in the
co-oscillating conditions.