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International Institute for Aerospace Survey, Netherlands (2001)

Estimation of rainfall using Meteosat TIR data for the Naivasha catchment

Tessema Mesfin, Alemu

Titre : Estimation of rainfall using Meteosat TIR data for the Naivasha catchment

Auteur : Tessema Mesfin, Alemu

Etablissement de soutenance : International Institute for Aerospace Survey, Netherlands

Grade : Master of Science (MSc) 2001

Résumé
Arial rainfall computed by kriging from point data measured with the available rain gauge network over the Naivasha catchment were used to calibrate a satellite rainfall algorithm using TIR METEOSAT data, through TAMSAT method approach. The TAMSAT technique uses infrared images and depends on the assumption that convective clouds are the main source of rain. Cold Cloud Duration at different thresholds and gauge data from 1994 to 1998 were compared in this study, it was shown that CCD 30 is an optimum threshold which shows the highest level of agreement with the gauge data in this region. The correlation between precipitation ground measurement and convective clouds derived from METEOSAT TIR data were computed for daily and decadal scales, the relation between precipitation and cold cloud field notably improved in decadal scale. Some of the statistical techniques have been utilized for the determination of the best relationship between rainfall and satellite data. The response of the runoff at the outlet of Malewa catchment to the event CCD and the kriged rainfall has been discussed briefly for two short periods during 1997 and 1998.

Sujets : Lake Naivasha, Kenya ; Malewa River, Kenya ; Watershed ; Remote sensing ; Meteorology ; Stormwater ;

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Page publiée le 10 janvier 2017, mise à jour le 14 novembre 2019