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vol-12INVESTIGATION Ol1.TIIE IIIGII FREQUENCY OSCILLATIONS
OF TilE SEA LEVEL IN THE WESTEHN HARBOUR
OF ALEXANDRIA, EGYPT.
A.. A.. EL-GINDY
Faculty of Science, Alexandria Universfty, ,Egypt.
ABSTRACT
The high frequency range of oscillations in the Western
harbour are studied using sea level records for 20 day
in each of the months June, 1980, October, 1980, January,
1981 April, 1981.
The spectral analysis is applied on different time series
(each having 720 points), with an interval time of 10
minutes.
Three significant peaks have bee” shown. The first lIu
a long period of about 12 hours due to astronOlllti:a~ ti4e.
The second has half an ~ur period. This peri04a,rees
with the calculated seiche peri~ in the basin AS. well
as the estimated edge wave peri~. Finally, a 8fte hevr
period oscillation was found anti it _treeswUb fter10d
of the beat between half an hour perio~ aR4 the seDidfurnal
tidal period.
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