THE INTENSITY AND EROSIVITY OF RAINSTORMS IN NIGERIA

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dc.contributor.authorAIYEPEKU, COMMANDER S.O.
dc.date.accessioned2014-02-05T10:35:26Z
dc.date.available2014-02-05T10:35:26Z
dc.date.issued1993-01
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY IN PARTIAL FULFILMENT OF THE AWARD OF THE DEGRE OF DOCTOR OF PHILOSOPHY (Ph.d) AHMADU BELLO UNIVERSITY, ZARIA.en_US
dc.description.abstractThis work is a study of the intensity and erosivity of rainstorms in Nigeria. Intensities and erosivity of 34,288 rainstorms spread throughout the country and over a period of 10 years (1960 to 1970) were quantified from autographic rainfall charts. The limit of erosive intensities was determined by using the Hudson KE > 25. The spatial variation of intensities showed that the proportion of non-erosive intensities that were less than 2 5mm hr-1 was high in the South and decreased with latitude. Conversely, the proportion of erosive storms increased with ward. The temporal variation of monthly mean intensive rainstorms in most southern stations showed high values at the beginning and at the end of the rainy season, with low values between July and September. A comparison of the relative performance of the three erosivity indices of Wischemeier's EI30 Hudson's KE > 25 and Lai's AI10 show that Lai's AI10 erosivity index is the mos applicable to the Nigerian environment.From the iso-erodent map constructed for the country using Lai's AI10 index, it was noted that the annual erosivity in the country ranges from a maximum of 140cm2 hr-1 in northwestern Nigeria to a maximum of 1,759 cm2 hr"1 in the Niger Delta area. The values decrease with latitude, showing a distribution that suggests a strong influence of the ITD's differentiated weather zones, coupled with local topograhic differences.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/282
dc.language.isoenen_US
dc.subjectINTENSITYen_US
dc.subjectEROSIVITYen_US
dc.subjectRAINSTORMSen_US
dc.subjectNIGERIAen_US
dc.titleTHE INTENSITY AND EROSIVITY OF RAINSTORMS IN NIGERIAen_US
dc.typeThesisen_US
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