17-12-2025
جامعة الملك عبدالعزيز
KING ABDULAZIZ UNIVERSITY
Faculty of Environmental Sciences
Document Details
Document Type
:
Article In Journal
Document Title
:
Estimation of Roughness Parameters and Sensible Flux in the Hada Al-Sham Area, Makkah
تقدير عناصر الاحتكاك وفيض الحرارة المحسوسة في منطقة هدى الشام، مكة المكرمة
Document Language
:
English
Abstract
:
Abstract. Examples of computed roughness length oz (m) in the Hada Al-Sham were presented as: Between Jumad El-Awwal, 6th and 12 th except on 9 th , the peak value was 1.6m at 1900 h, lower values of o z were observed and remained very close to an average of 0.03m between 1100-2000 h when the wind direction was nearly SW with an average wind direction of 255º. The higher friction velocities u∗ (ms –1 ) were found in the afternoon with an average of about 0.4 ms –1 with less effect of winds. Examples of maximum values of u∗ on J. El-Awwal 9 th attained up to 0.8 ms –1 at about 1900 h, on J. El-Awwal 12 th 1.0 ms –1 at 2100 h and on J. El-Awwal 15 th 1.7 ms –1 at 1730 h. The higher friction velocity on J. El-Awwal 9 th , was probably due to the change of the wind direction from SW (~223°) which was recorded at 1900 h to westerly wind at 1930 h (275º). The maximum value of sensible heat flux was found as 1118 Wm –2 at 1400 h on J. El-Awwal 15 th . Another maximum value of H was found as 1200 Wm –2 at 1200 h on J. El-Awwal 21 th . The afternoon peak values of H were found between 550 Wm –2 and ~ 700 Wm –2 from J. El-Awwal 6 th until J. El-Awwal 13 th .
ISSN
:
1319-1039
Journal Name
:
Meteorology, Environment and Arid Land Agriculture Sciences Journal
Volume
:
20
Issue Number
:
2
Publishing Year
:
1430 AH
2009 AD
Article Type
:
Article
Added Date
:
Sunday, July 8, 2012
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
عمر محمد عنبر
Anbar, O M
Investigator
Doctorate
oanbar@kau.edu.sa
Files
File Name
Type
Description
33861.pdf
pdf
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