Estimation of roughness parameters and sensible flux in The Hada al-Sham Area, Makkah
Other Title(s)
تقدير عناصر الاحتكاك و فيض الحرارة المحسوسة في منطقة هدى الشام، مكة المكرمة
Author
Source
Journal of King Abdul Aziz University : Meteorology, Environment and Arid land Agriculture Sciences
Issue
Vol. 20, Issue 2 (31 Dec. 2009), pp.77-93, 17 p.
Publisher
King Abdulaziz University Scientific Publishing Center
Publication Date
2009-12-31
Country of Publication
Saudi Arabia
No. of Pages
17
Main Subjects
Earth Sciences, Water and Environment
Topics
Abstract AR
قدمت أمثلة للأطوال الاحتكاكية على قيم z˳م التي تم حسابها في منطقة هدى الشام الزراعية بين 6 و 12 جمادى الأولى 1423هـ، حيث كانت قيم ˳z منخفضة و قريبة من الصفر (0،03 م)، بين الساعة 1100 صباحا و حتى الساعة 2000 مساء، بسبب تأثير الرياح الجنوبية الغربية، بحيث كان متوسط اتجاهها 255°.
أما في يوم 9 جمادى الأولى فكانت أقصى قيمة للطول z˳ هو 1،6 م عند الساعة 1900 مساء.
أما بالنسبة إلى قيمة السرعة الاحتكاكية u* بمتوسط 0،4 م / ثانية بعد الظهر، فقد وجدت مرتفعة مع تأثير أقل للرياح ما لم يعق وصولها أشجار عالية.
Abstract EN
Examples of computed roughness length o z (m) in the Hada Al-Sham were presented as: Between Jumad El-Awwal, 6th and 12th except on 9th, the peak value was 1.6m at 1900 h, lower values of 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 9th attained up to 0.8 ms–1at about 1900 h, on J.
El-Awwal 12th 1.0 ms–1 at 2100 h and on J.
El-Awwal 15th 1.7 ms–1at 1730 h.
The higher friction velocity on J.
El-Awwal 9th, 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 (º 275).
The maximum value of sensible heat flux was found as 1118 Wm–2 at 1400 h on J.
El-Awwal 15th.
Another maximum value of H was found as 1200 Wm–2 at 1200 h on J.
El-Awwal 21th.
The afternoon peak values of H were found between 550 Wm–2 and 700 Wm–2 from J.
El-Awwal 6th until J.
El-Awwal 13th.
American Psychological Association (APA)
Anbar, Umar Muhammad Yaqub. 2009. Estimation of roughness parameters and sensible flux in The Hada al-Sham Area, Makkah. Journal of King Abdul Aziz University : Meteorology, Environment and Arid land Agriculture Sciences،Vol. 20, no. 2, pp.77-93.
https://search.emarefa.net/detail/BIM-327411
Modern Language Association (MLA)
Anbar, Umar Muhammad Yaqub. Estimation of roughness parameters and sensible flux in The Hada al-Sham Area, Makkah. Journal of King Abdul Aziz University : Meteorology, Environment and Arid land Agriculture Sciences Vol. 20, no. 2 (2009), pp.77-93.
https://search.emarefa.net/detail/BIM-327411
American Medical Association (AMA)
Anbar, Umar Muhammad Yaqub. Estimation of roughness parameters and sensible flux in The Hada al-Sham Area, Makkah. Journal of King Abdul Aziz University : Meteorology, Environment and Arid land Agriculture Sciences. 2009. Vol. 20, no. 2, pp.77-93.
https://search.emarefa.net/detail/BIM-327411
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 90-91
Record ID
BIM-327411
