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Technische Universiteit Eindhoven (1988)

The boundary layer wind regime of a representative tropical African region, Central Sudan

Abu Bakr, EH

Titre : The boundary layer wind regime of a representative tropical African region, Central Sudan

Auteur : Abu Bakr, EH

Université de soutenance : Technische Universiteit Eindhoven

Grade : Doctor of Philosophy (PhD) 1988

Description
This thesis is a contributton to solve the outstanding problem of reliable aasesament of wind energy potentlal in tropical African countries without a sufficient number of meteorological stations. One solution for this problem is the development of some models to interpolate horizontally between the few available stations with surface wind and/or upper wind data. Such models have be n developed in the last decade for temperate-latitude countries. However, they are based on geostrophic similarity principles, assuming reasonably high Coriolis forces, while in the tropics such forces are much smaller. Moreover, in the tropics the air flow is dominated by other mechanisme, such as large stability variations in the atmosphere and the monsoon phenomena, which cause the above mentioned models to be inappropriate. To understand the physical processas of the tropical boundary layer wind regime a representative tropical region is considered, which measures about (700 x 800)km2 and lies between 12°N 30°E and 20°N 36°E in the Central Sudan. We made a detailed study of the climatological and geographical characteristics of the region. The topography of the region is relatively flat. The elimate of this region is semi-desert, and is strongly dependent on the Inter Tropical Converganee Zone (I.T.C.Z.), the high press re belts and the low pressure belts. In order to be able to develop a elimate model for Central Sudan and to check its accuracy, we constructed a sufficiently detailed and reliable data base. For this purpose unprocessed meteorological data (about 330 x 103 observations) from eight Sudanese stations, consisting of surface data and limited upper air soundings, were supplied by the Sudanese Meteorological Department in Khartoum. For the used stations we described the station surroundings and the quality of the observations. The data were processed by computer and corrected for obvious errors. The wind surface data are further corrected for local exposure deficiencies.

Présentation de la thèse

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Page publiée le 9 décembre 2011, mise à jour le 11 décembre 2016