DROUGHT MONITORING USING HIGH RESOLUTION SATELLITE-BASED RAINFALL PRODUCT ACROSS DIFFERENT RAINFALL REGIMES OF ETHIOPIA

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Research areas:
Year:
2017
Type of Publication:
Article
Keywords:
Drought, EDI, CHIRPS, Rainfall-regime
Authors:
Estifanos LEmma, RAAJ Ramsankaran
Abstract:
Drought is a recurrent phenomenon in the arid and semi-arid regions of Ethiopia. In the past two decades, millions of people are affected by drought throughout the country. Therefore, to assess and monitor historical drought, accurate rainfall record is crucial at different spatial and temporal scales. Although rain gauge observations provide long-term and accurate rainfall data, the distribution of most the rain gauges are sparsely distributed and very limited in many regions of the world and particularly in developing countries like Ethiopia. To solve this limitation, satellite-based rainfall products have been widely and successfully used in many hydrological applications. Therefore, in this study by considering its high spatial resolution and longer period record, the Climate Hazard group Infrared Precipitation with Stations version 2 (CHIRPSv2) satellite rainfall data has been used for drought monitoring across the rainfall regimes of Ethiopia. In the current study, due to its adaptability to different time scale, climatic conditions and its ability to determine the start and end of drought period, Effective drought index (EDI) has been applied for drought monitoring. Preliminary analysis indicates that the combination of EDI and CHIRPS rainfall product can be used to compute severity of drought. Detailed analysis being carried out and will be presented later.
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