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Wilk, J., Kniveton, D., Andersson, L., Layberry, R., Todd, M.C., Hughes, D., Ringrose, S. and Vanderpost, C. 2006. Estimating rainfall and water balance over the Okavango River Basin for hydrological applications. Journal of Hydrology, 331(1–2): 18–29


Description:

Estimating rainfall and water balance over the Okavango River Basin for hydrological applications.

Summary / Notes:

A historical database for use in rainfall-runoff modeling of the Okavango River Basin in Southwest Africa is presented. The work has relevance for similar data-sparse regions. The parameters of main concern are rainfall and catchment water balance, which are key variables for subsequent studies of the hydrological impacts of development and climate change. Rainfall estimates are based on a combination of in situ gauges and satellite sources. Rain gauge measurements are most extensive from 1955 to 1972, after which they are drastically reduced due to the Angolan civil war. The sensitivity of the rainfall fields to spatial interpolation techniques and the density of gauges were evaluated. Satellite based rainfall estimates for the basin are developed for the period from 1991 onwards, based on the Tropical Rainfall Measuring Mission (TRMM) and Special Sensor Microwave Imager (SSM/I) datasets. The consistency between the gauges and satellite estimates was considered. A methodology was developed to allow calibration of the rainfall-runoff hydrological model against rain gauge data from 1960 to 1972, with the prerequisite that the model should be driven by satellite derived rainfall products from 1990 onwards. With the rain gauge data, addition of a single rainfall station (Longa) in regions where stations earlier were lacking was more important than the chosen interpolation method. Comparison of satellite and gauge rainfall outside the basin indicated that the satellite overestimates rainfall by 20%. A non-linear correction was derived by fitting the rainfall frequency characteristics to those of the historical rainfall data. This satellite rainfall dataset was found satisfactory when using the Pitman rainfall-runoff model (Hughes, D., Andersson, L., Wilk, J., Savenije, H.H.G., this issue. Regional calibration of the Pitman model for the Okavango River. Journal of Hydrology). Intensive monitoring in the region is recommended to increase accuracy of the comprehensive satellite rainfall estimate calibration procedure. Keywords: Rainfall estimates, Satellite data, Raingauge, Co-kriging, River basin, Okavango.

Year: 2006

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/S0022169406002502


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Pinheiro, I., Gabaake, G. and Heyns, P. 2003. Chapter 5: Cooperation in the Okavango river basin: The OKACOM perspective. In: Turton, A., Ashton, P. and Cloete, E. (eds.) Transboundary rivers, sovereignty and development: Hydropolitical Drivers in the Okavango River basin, pages 105-118
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Nicol, A. 2003. Chapter 8: The dynamics of river basin cooperation: The Nile and Okavango basins. In: Turton, A., Ashton, P. and Cloete, E. (eds.) Transboundary rivers, sovereignty and development: Hydropolitical Drivers in the Okavango River basin, pages 167-186
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Hughes, D.A., Andersson, L., Wilk, J. and Savenije, H.H.G.2006. Regional calibration of the Pitman model for the Okavango River. Journal of Hydrology, 331(1–2): 30–42
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Pröpper, M., Gröngröft, A., Finckh, M., Stirn, S., de Cauwer, V., Lages, F., Masamba, W., Murray-Hudson, M., Schmidt, L., Strohbach, B. and Jürgens, N. 2015. The Future Okavango - Conclusões, Cenários e Recomendações para Ações. Síntese do Relatório Final do Projeto de Pesquisa, 2010 a 2015, 199 pages
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Andersson, L., Gumbricht, T., Hughes, D., Kniveton, D., Ringrose, S., Savenije, H., Todd, M., Wilk, J. and Wolski, P. 2003. Water Flow Dynamics in the Okavango River Basin and Delta - A prerequisite for the Ecosystems of the Delta. Physics and Chemistry of the Earth, Parts A/B/C, 28(20–27): 1165–1172
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Gieske, A. Influence of shallow groundwater levels on outflow from the Okavango Delta, Botswana. University of Botswana, Geology Department, Gaborone, Botswana
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Wilson, B.H. and Dincer, T. 1976. An introduction to the hydrology and hydrography of the Okavango Delta. Okavango Delta Symposium, Proceedings of the Symposium on the Okavango Delta and its future utilization, National Museum, Gaborone, (Botswana Society)
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Biggs, R.C. 1976. The effects of seasonal flood regime on the ecology of Chief's Island and the adjacent floodplain system. Okavango Delta Symposium, Proceedings of the Symposium on the Okavango Delta and its future utilization, National Museum, Gaborone
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von Durckheim, K. 2010. Overview Report pertaining to the Okavango Basin and the Upper Zambezi Basin
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Turton, A. 2003. Chapter 4: The hydropolitical dynamics of cooperation in Southern Africa: A strategic perspective on institutional development in international river basins. In: Turton, A., Ashton, P. and Cloete, E. (eds.) Transboundary rivers, sovereignty and development: Hydropolitical Drivers in the Okavango River basin, pages 83-103
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Porto,J.G. and Clover, J. 2003. Chapter 3: The peace dividend in Angola: Strategic implications for Okavango basin cooperation. In: Turton, A., Ashton, P. and Cloete, E. (eds.) Transboundary rivers, sovereignty and development: Hydropolitical Drivers in the Okavango River basin, pages 65-81
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