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자료유형
학술저널
저자정보
Kruger, A.C. (Climate Service Division, South African Weather Service) Goliger, A.M. (Division of Built Environment, CSIR) Retief, J.V. (Department of Civil Engineering, University of Stellenbosch) Sekele, S. (Climate Service Division, South African Weather Service)
저널정보
테크노프레스 Wind & structures Wind & structures 제13권 제1호
발행연도
2010.1
수록면
37 - 55 (19page)

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In this paper South Africa is divided into strong wind climate zones, which indicate the main sources of annual maximum wind gusts. By the analysis of wind gust data of 94 weather stations, which had continuous climate time series of 10 years or longer, six sources, or strong-wind producing mechanisms, could be identified and zoned accordingly. The two primary causes of strong wind gusts are thunderstorm activity and extratropical low pressure systems, which are associated with the passage of cold fronts over the southern African subcontinent. Over the eastern and central interior of South Africa annual maximum wind gusts are usually caused by thunderstorm gust fronts during summer, while in the western and southern interior extratropical cyclones play the most dominant role. Along the coast and adjacent interior annual extreme gusts are usually caused by extratropical cyclones. Four secondary sources of strong winds are the ridging of the quasi-stationary Atlantic and Indian Ocean high pressure systems over the subcontinent, surface troughs to the west in the interior with strong ridging from the east, convergence from the interior towards isolated low pressure systems or deep coastal low pressure systems, and deep surface troughs on the West Coast.

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