Hydrological Balance of Lake Tana, Upper Blue Nile Basin, Ethiopia

T.H.M. Rientjes, Janaka B.U. Perera, A.T. Haile, Ambro S.M. Gieske, Martijn J. Booij, Paolo Reggiani

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Abstract

In recent years, few studies are presented on the water balance of Lake Tana. In these studies, the water balance is closed by unknown runoff contributions from ungauged catchments. Studies relied on simple procedures of area comparison to estimate runoff from ungauged catchments. In this study, emphasis is on regionalisation approaches by the use of physical catchment characteristics and a regional model. For runoff modelling, the HVB-96 model is selected while automated calibration is applied as based on a Monte Carlo procedure. Closure of the lake water balance was established by comparing measured to estimated lake levels. Results of daily lake level simulation show a relative volume error of 2.17% and a Nash–Sutcliffe coefficient of 0.92. Results show runoff from ungauged catchments of 527 mm/year for the simulation period 1994–2003 while the closure term only is 85 mm. Compared to previous works this closure term is smallest.
Original languageEnglish
Title of host publicationNile River Basin Hydrology, Climate and Water Use
EditorsAssefa M. Melesse
Place of PublicationDordrecht
PublisherSpringer
Pages69-89
Number of pages419
ISBN (Print)978-94-007-0689-7
DOIs
Publication statusPublished - 2011

Publication series

Name
PublisherSpringer

Keywords

  • Regionalisation · Lake Tana · Bathymetry · Water balance closure
  • IR-78682
  • METIS-274969

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    Rientjes, T. H. M., Perera, J. B. U., Haile, A. T., Gieske, A. S. M., Booij, M. J., & Reggiani, P. (2011). Hydrological Balance of Lake Tana, Upper Blue Nile Basin, Ethiopia. In A. M. Melesse (Ed.), Nile River Basin Hydrology, Climate and Water Use (pp. 69-89). Dordrecht: Springer. https://doi.org/10.1007/978-94-007-0689-7_3