Variability of rainfall over Lake Kariba catchment area in the Zambezi river basin, Zimbabwe

dc.contributor.authorMuchuru, Shepherd
dc.contributor.authorBotai, Joel Ongego
dc.contributor.authorBotai, Mihloti Christina
dc.contributor.authorLandman, Willem Adolf
dc.contributor.authorAdeola, Abiodun Morakinyo
dc.date.accessioned2015-03-26T06:17:20Z
dc.date.available2015-03-26T06:17:20Z
dc.date.issued2016-04
dc.description.abstractIn this study, average monthly and annual rainfall totals recorded for the period 1970 to 2010 from a network of 13 stations across the Lake Kariba catchment area of the Zambezi river basin were analyzed in order to characterize the spatial-temporal variability of rainfall across the catchment area. In the analysis, the data were subjected to intervention and homogeneity analysis using the Cumulative Summation (CUSUM) technique and step change analysis using rank-sum test. Furthermore, rainfall variability was characterized by trend analysis using the non-parametric Mann-Kendall statistic. Additionally, the rainfall series were decomposed and the spectral characteristics derived using Cross Wavelet Transform (CWT) and Wavelet Coherence (WC) analysis. The advantage of using the wavelet-based parameters is that they vary in time and can therefore be used to quantitatively detect time-scale-dependent correlations and phase shifts between rainfall time series at various localized time-frequency scales. The annual and seasonal rainfall series were homogeneous and demonstrated no apparent significant shifts. According to the inhomogeneity classification, the rainfall series recorded across the Lake Kariba catchment area belonged to category A (useful) and B (doubtful), i.e., there were zero to one and two absolute tests rejecting the null hypothesis (at 5 % significance level), respectively. Lastly, the long-term variability of the rainfall series across the Lake Kariba catchment area exhibited non-significant positive and negative trends with coherent oscillatory modes that are constantly locked in phase in the Morlet wavelet space.en_ZA
dc.description.embargo2017-04-12en_ZA
dc.description.librarianhb2015en_ZA
dc.description.urihttp://link.springer.com/journal/704en_ZA
dc.identifier.citationMuchuru, S, Botai, JO, Botai, CM, Landman, WA & Adeola, AM 2016, 'Variability of rainfall over Lake Kariba catchment area in the Zambezi river basin, Zimbabwe', Theoretical and Applied Climatology, vol. 124, no. 1, pp. 325-338.en_ZA
dc.identifier.issn0177-798X (print)
dc.identifier.issn1434-4483 (online)
dc.identifier.other10.1007/s00704-015-1422-1
dc.identifier.urihttp://hdl.handle.net/2263/44149
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© Springer-Verlag Wien 2015. The original publication is available at : http://link.springer.com/journal/704.en_ZA
dc.subjectLake Karibaen_ZA
dc.subjectZambezi river basinen_ZA
dc.subjectZimbabween_ZA
dc.subjectRainfall variabilityen_ZA
dc.titleVariability of rainfall over Lake Kariba catchment area in the Zambezi river basin, Zimbabween_ZA
dc.typePostprint Articleen_ZA

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