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Sains Malaysiana 45(1)(2016): 99–107 Wind Tunnel Experimental Research on the
Effect of Col Topography on Wind Environment (Penyelidikan Eksperimen Terowong Angin
ke atas Kesan Topografi Kol Alam Sekitar Angin) LIU HUI* Department of Civil Engineering,
Sichuan
College of Architectural Technology 618000
Sichuan, China Received: 17 July 2014/Accepted:
2 November 2014 ABSTRACT Investigation of meteorological
disasters caused by small-scale topography shows that flashover
due to wind age yaw occurred quite often where col topography existed.
Considering that the distribution pattern of wind profile at different
locations of a col topography is not clear, this paper, with wind
tunnel tests, studied the influenced of such topographic features
of a col as hill slope and valley mouth width on the wind profile
at different locations. The results of wind tunnel tests indicated
that over-hill wind has a stronger effect on wind velocity correction
coefficient than does valley wind, that compared to flat terrain
wind velocity, the maximum speed-up amplitude of wind velocity at
valley throat and hill summit reach 33 and 53%, respectively, apparently
higher than 10% specified in Codes, that wind velocity at valley
throat increases with the increase of hill slope and decreases with
the increase of valley mouth width, that wind velocity in the valley
basically does not go up when the slope of one hill side is smaller
than 0.1 and that wind velocity at the same non-dimensional height
of a 3D hill summit increases with the increase of hill height. Keywords: Col; wind tunnel
test; wind velocity correction coefficient ABSTRACT Kajian bencana meteorologi
yang disebabkan oleh topografi berskala kecil menunjukkan bahawa
lampau kilat kerana anginan rewang berlaku agak kerap dengan kol
topografi wujud. Memandangkan bahawa pola taburan profil angin di
lokasi yang berbeza daripada topografi kol tidak jelas, kertas kerja
ini dengan ujian terowong angin, mengkaji pengaruh ciri-ciri seperti
topografi kol sebagai cerun bukit dan lembah lebar mulut ke atas
profil angin di lokasi yang berbeza. Keputusan ujian terowong angin
menunjukkan bahawa angin lepas bukit mempunyai kesan yang kuat pada
pekali pembetulan halaju angin daripada angin lembah atas dengan
halaju angin rupa bumi rata, amplitud kelajuan sehingga maksimum
halaju angin di lembah tekak dan puncak bukit masing-masing pada
33 dan 53%, nampaknya 10% lebih tinggi daripada yang dinyatakan
dalam Kod, bahawa halaju angin di lembah tekak bertambah dengan
peningkatan cerun bukit dan berkurang dengan peningkatan lebar mulut
lembah, bahawa halaju angin di lembah itu pada dasarnya tidak naik
apabila lereng bukit satu bahagian lebih kecil daripada 0.1 dan
bahawa halaju angin pada ketinggian tanpa dimensi yang sama sidang
kemuncak bukit 3D meningkat dengan peningkatan ketinggian bukit. Kata kunci: Angin pekali pembetulan halaju; kol; ujian terowong angina REFERENCES Ashraf,
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Environmental Earth Sciences 73(4): 1443-1458. *Corresponding author; email: lyzliuhui@126.com
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