Paper Information

Title: 

A PHYSICAL MODEL OF DOWNBURST AND COMPARISON WITH AN OBSERVATION IN TEHRAN AREA

Type: PAPER
Author(s): FEYZ ABADI NAHID,ALIAJBARI ABBASALI
 
 
 
Name of Seminar: CONFRANCE ZHEOFIZIKE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  ANJOMANE MELI ZHEOFIZIK IRAN
Date:  2006Volume 12
 
 
Abstract: 

DOWNBURSTS ARE SMALL-SCALE, SHORT-LIVED AND ENERGETIC EVENTS IN THE ATMOSPHERE. DISTINCTIVE FEATURES ASSOCIATED WITH DOWNBURST ARE: A SUDDEN DROP IN TEMPERATURE, SUDDEN INCREASE IN WIND SPEED, WIND SHIFT, PRESSURE RISE AND HUMIDITY INCREMENT. IN THIS STUDY, A PHYSICAL MODEL OF DOWNBURSTS HAS BEEN PRESENTED.
VERTICAL RELEASE OF KNOWN VOLUME DENSE FLUID IS SIMULATED IN AN ISOTROPIC AND A DENSITY STRATIFIED ENVIRONMENT. AS SOON AS THE RELEASED FLUID REACHES THE SURFACE, IT FORMS THE SHAPE OF A VORTEX RING AND SPREADS OUT IN ALL DIRECTIONS LIKE GRAVITY CURRENT. TYPICAL FROUDE NUMBERS OF THE FLOW IN 0.7 THE STRUCTURE OF THE FLOW IN MONITORED BY CONDUCTIVITY PROBES SHOWING INHOMOGENEOUS TURBULENT STRUCTURE. SUCH AS VERTICALLY MOVING FLOW IN THE ATMOSPHERE. CAN LEAD TO DANGER TO FLYING AIRCRAFTS NEAR THE GROUND AND HENCE MUST BE STUDIED AND MONITORED NEAR THE AIRPORTS.

 
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