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      Identifying hydro-meteorological events from precipitation extremes indices and other sources over northern Namibia, Cuvelai Basin

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          Abstract

          Worldwide, more than 40% of all natural hazards and about half of all deaths are the result of flood disasters. In northern Namibia flood disasters have increased dramatically over the past half-century, along with associated economic losses and fatalities. There is a growing concern to identify these extreme precipitation events that result in many hydro-meteorological disasters. This study presents an up to date and broad analysis of the trends of hydro-meteorological events using extreme daily precipitation indices, daily precipitation data from the Grootfontein rainfall station (1917–present), regionally averaged climatologies from the gauged gridded Climate Research Unit (CRU) product, archived disasters by global disaster databases, published disaster events in literature as well as events listed by Mendelsohn, Jarvis and Robertson (2013) for the data-sparse Cuvelai river basin (CRB). The listed events that have many missing data gaps were used to reference and validate results obtained from other sources in this study. A suite of ten climate change extreme precipitation indices derived from daily precipitation data (Grootfontein rainfall station), were calculated and analysed. The results in this study highlighted years that had major hydro-meteorological events during periods where no data are available. Furthermore, the results underlined decrease in both the annual precipitation as well as the annual total wet days of precipitation, whilst it found increases in the longest annual dry spell indicating more extreme dry seasons. These findings can help to improve flood risk management policies by providing timely information on historic hydro-meteorological hazard events that are essential for early warning and forecasting.

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          Most cited references36

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          Global observed changes in daily climate extremes of temperature and precipitation

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            Detection and Attribution of Twentieth-Century Northern and Southern African Rainfall Change

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              Global changes in extreme events: regional and seasonal dimension

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                Author and article information

                Journal
                Jamba
                JAMBA
                Jàmbá : Journal of Disaster Risk Studies
                AOSIS OpenJournals
                2072-845X
                1996-1421
                30 October 2015
                2015
                : 7
                : 1
                : 177
                Affiliations
                [1 ]Department of Geography, University of Canterbury, New Zealand
                [2 ]Department of Geography, History and Environmental Studies, University of Namibia, Namibia
                Author notes
                Correspondence to: Frans Persendt, Email: fpersendt@ 123456unam.na Postal address: Private Bag X13301, Windhoek, Namibia

                How to cite this article: Persendt, F.C., Gomez, C. & Zawar-Reza, P., 2015, ‘Identifying hydro-meteorological events from precipitation extremes indices and other sources over northern Namibia, Cuvelai Basin’, Jàmbá: Journal of Disaster Risk Studies 7(1), Art. #177, 18 pages. http://dx.doi.org/10.4102/jamba.v7i1.177

                Article
                JAMBA-7-177
                10.4102/jamba.v7i1.177
                6014122
                1a0f623e-2362-4573-88b8-778fab9eff68
                © 2015. The Authors

                Licensee:AOSIS OpenJournals. This work is licensed under the Creative Commons Attribution License.

                History
                : 14 March 2015
                : 11 August 2015
                Categories
                Original Research

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