VARIATIONS OF WIND VELOCITY WITH TIME AND SPACE ALONG ALEXANDRIA AND ABUKIR COASTAL ZONE OF EGYPT.

VARIATIONS OF WIND VELOCITY WITH TIME AND SPACE

ALONG ALEXANDRIA AND ABUKIR COASTAL ZONE OF EGYPT.

A. H. AHMED EL-GINDY* AND A. A. HAMED**.
*Oc”anography Dept •• Facultil of Science. Alex. Univ •• Egypt.

**Head of Hydrometeorological Office. Egyptian Navy Force.

ABSTRACT
The hourly values of wind velocity in the period
from January. 1976 to December. 1979 at Ra~ Eltin
station (Alexandr1a) as well as at Abuk1r station
f”om February to December. 1979 were analysed. The.
monthly as well as the annual variat10ns of the
variance and the spectrum were studied and the
coherence between Ras Elt1n and Abukir winds was
determined. The k1net1c energy of w1nd is minimum
in summer and max1mu~ in december. The most important
variance of wind 15 found in the low ferquency range
with period up to 24 h. The normal to the shore
component of the w1 nd .( re1at1ve to Alexandria coas t) •
in 1979 was significantly coherent between the two
stations. nearly all the year, in the periods equal
or grea ter than 20.57 hours. The longshore component
was coherent only up to 28.80 hours. in February,
March, May, June, November and December. The 1imfted
coherence of the longshore component could be explained
by the influence of the land.
The linear equations relating the dal1y mean
longshore components (and the normal to shore
components) at the two stations were calculated
and the correlation coeffecients were significant
at a11 months.