nature of rainfall in the main drainage sub-basins of Uganda

A study of rainfall trends and temporal variations within seven sub-basins of Uganda spanning from 1940 to 2009 has been made. Rainfall climatologies are constructed from observational data, using 36 station records which reflect hydroclimatic conditions. Long-term changes in rainfall characteristic...

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Bibliographic Details
Published in:Hydrological sciences journal 2014-02, Vol.59 (2), p.278-299
Main Authors: Nsubuga, Francis W.N, Botai, O.J, Olwoch, Jane M, Rautenbach, C.J. deW, Bevis, Yvette, Adetunji, Adebayo O
Format: Article
Language:English
Subjects:
analyse de tendance
de la sécheresse
drainage
drainage sub-basins
drought
drought severity index
indice de concentration des précipitations
indice de sévérité
Mann-Kendall
Mann-Kendall, test T de Sen
Ouganda
precipitation concentration index
rain
seasonal variation
Sen's T test
sous-bassins hydrographiques
trend analysis
Uganda
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Summary:A study of rainfall trends and temporal variations within seven sub-basins of Uganda spanning from 1940 to 2009 has been made. Rainfall climatologies are constructed from observational data, using 36 station records which reflect hydroclimatic conditions. Long-term changes in rainfall characteristics were determined by non-parametric tests (Mann-Kendall and Sen’s T tests), coefficient of variation (CV), precipitation concentration index and drought severity index. Magnitude of change was estimated by applying Sen’s estimator of slope. Decadal variability of rainfall with marked seasonal cycles is evident. Temporal variability of drought patterns is detected. Variations in annual rainfall are low with no significant trends observed in the main drainage sub-basins. Significant trends occur in October, November, December and January. A noticeable decrease in the annual total rainfall was observed mostly in northwestern and southwestern sub-basins. Rainfall trend in the second normal of June–July–August (JJA) was decreasing in all the main drainage sub-basins. Editor Z.W. Kundzewicz; Associate editor S. Yue Citation Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J.deW., Bevis, Y., and Adetunji, A.O., 2014. The nature of rainfall in the main drainage sub-basins of Uganda. Hydrological Sciences Journal , 59 (2), 278–299.
ISSN:2150-3435
0262-6667
2150-3435
DOI:10.1080/02626667.2013.804188