Document Details

Document Type : Article In Journal 
Document Title :
Measurements of momentum and sensible heat flux using eddy correlation method in the mina valley during the haj period
قياسات القوة الدافعة وطاقة الحرارة المحسوسة باستخدام طريقة الترابط لحركة الدوامات بوادي منى خلال فترة الحج
 
Document Language : English 
Abstract : Direct measurements of sensible heat flux were made in the Mina valley during Haj Period. Fifteen-minute average of the correlations between the fluctuations of the two signals ( w' T' ) and later the vertical turbulent heat flux were computed from a Remtech fluxmeter station. Friction velocity u was deduced from the fluxmeter data as well. It was seen particularly on Dhu Al-Hijjah 11 starting from 2100 h until next day at 0200 h on Dhu Al-Hijjah 12, u was attained up to 0.8 ms–1 at night. This may be interpreted as the direction was easterly to south easterly wind. The wind flowed across obstacles such as tents, shelters, high buildings ... etc. It was noticed always that evenings sensible heat had positive values, most probably because at night the long wave radiation doesn’t escape outside the valley but collides with vertical walls and slopes of the valley and then reflects to the ground. Thus the contribution of large amounts of long wave and the resulting excessive heat on the floor in addition to thousands of pilgrims standing there keep the warm lower layer of the valley unstable throughout night. 
ISSN : 1319-1039 
Journal Name : Meteorology, Environment and Arid Land Agriculture Sciences Journal 
Volume : 18 
Issue Number : 1 
Publishing Year : 1428 AH
2007 AD 
Article Type : Article 
Added Date : Monday, August 6, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عمر محمد عنبرAnbar, Omar MohamedInvestigatorDoctorate 

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