Year to year variation of rainfall rate and rainfall regime in Ota, southwest Nigeria for the year 2012 to 2015
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IOP Publishing
Abstract
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The tropics is characterized to have convective type of rainfall which has high
occurrence of rainfall compared to the temperate regions of the world. In this paper, the
accumulation of rainfall in Ota, Southwest, Nigeria (6o 42 N, 3o 14 E) has been analysed to
present the one-minute rainfall rate and the predominant type of rainfall. Four years’ data used
for this study was taken using the Davis Wireless vantage Pro2 weather station at Covenant
University, Ota, Ogun State. The data collected were used to analyse the one-minute rainfall
rate and different types of rainfall predominant in this region. For the prediction and
modelling of rain attenuation at microwave frequencies for a region like the Nigeria at various
percentage of time, one-minute rainfall rate is required. Nigeria falls into the P zone of 114
mm/hr. as per International Telecommunication Union – Recommendation (ITU-R). The
analysis carried out indicated that the measured yearly averaged maximum one-minute rainfall
rate for 2012, 2013, 2014 and 2015 are 157.7 mm/h, 148.0 mm/h, 241.2 mm/h and 157.3
mm/h respectively. It also indicated that the drizzle type of rainfall is predominant in contrast
to established fact that thunderstorm occurs more in the tropics.
Keywords
QC Physics