Abstract:
Two dimensional sea breeze & land breeze model describes a combined
observational and theoretical study of sea breeze & land 1Jreezeover Sri Lanka. The
structure of the sea breeze circulation and its variations in time were obtained from
observations. The observational data were gathered with surface stations, pilot
balloons and radar radiosonde stations.
Over the land the depth of the layer of sea breeze flow is approximately 1500
m and velocity of 8 knots (4 ms-I) is observed with 34 Ian inland penetration. Well
defined sea breeze current is apparent early afternoon and dies away in the evening.
The wind model for simulating the wind flow in two dimensional spaces is
described. The model predicts winds at different levels, in terrain following (J
coordinate. Physical processes such as horizontal diffusion, diurnal heating and
cooling are incorporated.
The empirical constants associated with the physical effect terms in the
horizontal momentum equations and thermodynamic equation of the wind model is
properly calibrated. Calibrated model is applied to Sri Lanka under the inter monsoon
condition in order to check the performance of the model. The use of computer and
the fraction of time required to run the program are the principal advantages of this
model.
A two dimensional, time dependent, primitive equation model was constructed
to simulate the observed sea breeze. The numerical simulation is reasonably realistic;
however the sea breeze intensity and inland penetration were under estimated.
