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
عمر محمد عنبر | Anbar, O M | Investigator | Doctorate | oanbar@kau.edu.sa |
|
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