Rainfall variability, drought characterization, and efficacy of rainfall data reconstruction: case of eastern Kenya

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dc.creatorKisaka, M. Oscar
dc.creatorMucheru-Muna, M.
dc.creatorNgetich, Felix K.
dc.creatorMugwe, JN
dc.creatorMugendi, D
dc.creatorMairura, Franklin S.
dc.date2015
dc.date2015-06-02T16:52:21Z
dc.date2015-06-02T16:52:21Z
dc.date.accessioned2026-06-27T14:39:43Z
dc.descriptionThis study examined the extent of seasonal rainfall variability, drought occurrence, and the efficacy of interpolation techniques in eastern Kenya. Analyses of rainfall variability utilized rainfall anomaly index, coefficients of variance, and probability analyses. Spline, Kriging, and inverse distance weighting interpolation techniques were assessed using daily rainfall data and digital elevation model using ArcGIS. Validation of these interpolation methods was evaluated by comparing the modelled/generated rainfall values and the observed daily rainfall data using root mean square errors and mean absolute errors statistics. Results showed 90% chance of below cropping threshold rainfall (500 mm) exceeding 258.1 mm during short rains in Embu for one year return period. Rainfall variability was found to be high in seasonal amounts (CV = 0.56, 0.47, and 0.59) and in number of rainy days (CV = 0.88, 0.49, and 0.53) in Machang’a, Kiritiri, and Kindaruma, respectively. Monthly rainfall variability was found to be equally high during April and November (CV = 0.48, 0.49, and 0.76) with high probabilities (0.67) of droughts exceeding 15 days in Machang’a and Kindaruma. Dry-spell probabilities within growing months were high, (91%, 93%, 81%, and 60%) in Kiambere, Kindaruma, Machang’a, and Embu, respectively. Kriging interpolation method emerged as the most appropriate geostatistical interpolation technique suitable for spatial rainfall maps generation for the study region.
dc.identifierhttps://hdl.handle.net/10568/66587
dc.identifier.urihttp://hdl.handle.net/123456789/84755
dc.languageen
dc.publisherHindawi Limited
dc.rightsOpen Access
dc.sourceKisaka, M. Oscar; Mucheru-Muna, M.; Ngetich, F. K.; Mugwe, J. N.; Mugendi, D.; Mairura, F.. 2015. Rainfall variability, drought characterization, and efficacy of rainfall data reconstruction: case of eastern Kenya . Advances in Meteorology 16 p.
dc.titleRainfall variability, drought characterization, and efficacy of rainfall data reconstruction: case of eastern Kenya
dc.typeJournal Article

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