Paper Information

Title: 

AN OBSERVATIONAL STUDY OF TURBULENCE IN ATMOSPHERIC BOUNDARY LAYER WITH COMPLEX TOPOGRAPHY

Type: PAPER
Author(s): BIDOKHTI A.A.,SAGHAFI M.A.
 
 
 
Name of Seminar: CONFERENCE ON FLUID DYNAMICS
Type of Seminar:  CONFERENCE
Sponsor:  IRANIAN PHYSICS SOCIETY
Date:  2004Volume 9
 
 
Abstract: 

THE AIM OF THIS PAPER IS TO PRESENT SOME RECENTLY ACQUIRED RESULTS FROM ATMOSPHERIC BOUNDARY LAYER TURBULENCE, INCLUDING TURBULENT FLUXES IN AN AREA IN TEHRAN WITH COMPLEX TOPOGRAPHY, USING SODAR (PA1) DATA FOR A PERIOD BETWEEN 20TH TO 24TH AUGUST 2002 FOR WHICH NO ACTIVE SYNOPTIC SYSTEM WERE IN THE AREA. IN SUCH CONDITION THE WIND REGIME OBEYS A THERMALLY INDUCED MOUNTAIN DRIVEN CIRCULATION WHICH CHANGES BETWEEN DAY AND NIGHT. VERTICAL PROFILES OF SU, SV AND SW SHOW THAT TURBULENCE IS SUBSTANTIALLY LESS AT NIGHTS COMPARED TO DAY TIME VALUES. ALSO THE TURBULENCE INTENSITY AND TKE ARE REDUCED FUNCTIONS OF RIG. IN NIGHT TIME STABLE CONDITION THE INTERNAL WAVE’S ACTIVITIES ARE EXPECTED WHICH ARE RESPONSIBLE FOR SOME OF THE RANDOM OSCILLATION IN THE RECORDED SIGNALS (MONTI ET AL. 2002). SUCH WAVES MAY ALSO BE RESPONSIBLE FOR COMPLEX WAVY STRUCTURE OF MEAN WIND SPEED VERTICAL STRUCTURE. THE ONLY LIMITATION OF THE SODAR MEASURING SYSTEM, USED HERE IS ITS AVERAGING PERIOD THAT COULD NOT BE LESS THAN 15 MIN. HENCE SOME HIGH FREQUENCY FLUCTUATIONS ARE UNWONTEDLY FILTERED.

 
Keyword(s): TURBULENCE, URBAN AREA, SODAR, INTERNAL WAVES, COMPLEX TOPOGRAPHY
 
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