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

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dc.contributor.author Muchuru, Shepherd
dc.contributor.author Botai, J.O. (Joel Ongego)
dc.contributor.author Botai, M.C. (Mihloti Christina)
dc.contributor.author Landman, W.A. (Willem Adolf), 1964-
dc.contributor.author Adeola, A.M. (Abiodun Morakinyo)
dc.date.accessioned 2015-03-26T06:17:20Z
dc.date.available 2015-03-26T06:17:20Z
dc.date.issued 2016-04
dc.description.abstract In 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.embargo 2017-04-12 en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.uri http://link.springer.com/journal/704 en_ZA
dc.identifier.citation Muchuru, 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.issn 0177-798X (print)
dc.identifier.issn 1434-4483 (online)
dc.identifier.other 10.1007/s00704-015-1422-1
dc.identifier.uri http://hdl.handle.net/2263/44149
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © Springer-Verlag Wien 2015. The original publication is available at : http://link.springer.com/journal/704. en_ZA
dc.subject Lake Kariba en_ZA
dc.subject Zambezi river basin en_ZA
dc.subject Zimbabwe en_ZA
dc.subject Rainfall variability en_ZA
dc.title Variability of rainfall over Lake Kariba catchment area in the Zambezi river basin, Zimbabwe en_ZA
dc.type Postprint Article en_ZA


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