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To What Extent Is Hydrologic Connectivity Taken into Account in Catchment Studies in the Lake Tana Basin, Ethiopia? A Review

Author

Listed:
  • Anik Juli Dwi Astuti

    (Department of Geography, Ghent University, 9000 Ghent, Belgium
    Department of Geography, Universitas Negeri Medan, Medan 20221, Indonesia)

  • Sofie Annys

    (Department of Geography, Ghent University, 9000 Ghent, Belgium)

  • Mekete Dessie

    (School of Civil and Water Resources Engineering, Bahir Dar University, Bahir Dar P.O. Box 430, Ethiopia)

  • Jan Nyssen

    (Department of Geography, Ghent University, 9000 Ghent, Belgium)

  • Stefaan Dondeyne

    (Department of Geography, Ghent University, 9000 Ghent, Belgium)

Abstract

Knowledge of hydrologic connectivity is important to grasp the hydrological response at a basin scale, particularly as changes in connectivity can have a negative effect on the environment. In the context of a changing climate, being able to predict how changes in connectivity will affect runoff and sediment transport is particularly relevant for land-use planning. Many studies on hydrology, geomorphology and climatology have been conducted in the Lake Tana Basin in Ethiopia, which is undergoing rapid development and significant environmental changes. This systematic literature review aims at assessing to what extent the hydrologic connectivity has been taken into account in such research, and to identify research gaps relevant to land and water management. On the Web of Science and Scopus databases, 135 scientific articles covering those topics were identified. Aspects of hydrologic connectivity were mostly implicitly taken into account based on process-based, statistical and descriptive models. Amongst the drivers of changing connectivity, the climate was covered by a large majority of publications (64%). Components of structural hydrologic connectivity were accounted for by considering geomorphology (54%) and soils (47%), and to a lesser extent, hydrography (16%) and geology (12%). Components of functional connectivity were covered by looking at surface water fluxes (61%), sediment fluxes (18%) and subsurface water fluxes (13%). While numerous studies of the Lake Tana Basin accounted for the hydrologic connectivity implicitly, these related predominantly to functional components. The structural components are given less attention, while in the context of a changing climate, better insights into their influence on the hydrologic seem most relevant. Better knowledge of the static aspect of connectivity is particularly important for targeting appropriate soil and water conservation strategies. Being able to explicitly assess the ‘structural connectivity’ is therefore of direct relevance for land management and land-use policy.

Suggested Citation

  • Anik Juli Dwi Astuti & Sofie Annys & Mekete Dessie & Jan Nyssen & Stefaan Dondeyne, 2022. "To What Extent Is Hydrologic Connectivity Taken into Account in Catchment Studies in the Lake Tana Basin, Ethiopia? A Review," Land, MDPI, vol. 11(12), pages 1-18, November.
    • Handle: RePEc:gam:jlands:v:11:y:2022:i:12:p:2165-:d:989245
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    References listed on IDEAS

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    1. Walker, D. & Parkin, G. & Gowing, J. & Haile, Alemseged Tamiru, 2019. "Development of a hydrogeological conceptual model for shallow aquifers in the data scarce Upper Blue Nile Basin," Papers published in Journals (Open Access), International Water Management Institute, pages 6(2):1-24..
    2. Annys, Sofie & Van Passel, Steven & Dessein, Joost & Adgo, Enyew & Nyssen, Jan, 2020. "From fast-track implementation to livelihood deterioration: The dam-based Ribb Irrigation and Drainage Project in Northwest Ethiopia," Agricultural Systems, Elsevier, vol. 184(C).
    3. Adugnaw T. Akale & Dessalegn C. Dagnew & Mulugeta A. Belete & Seifu A. Tilahun & Wolde Mekuria & Tammo S. Steenhuis, 2017. "Impact of Soil Depth and Topography on the Effectiveness of Conservation Practices on Discharge and Soil Loss in the Ethiopian Highlands," Land, MDPI, vol. 6(4), pages 1-17, November.
    4. Gumindoga, W. & Rientjes, T. H. M. & Haile, Alemseged Tamiru & Makurira, H. & Reggiani, P., 2019. "Performance of bias-correction schemes for CMORPH rainfall estimates in the Zambezi River Basin," Papers published in Journals (Open Access), International Water Management Institute, pages 23(7):2915-.
    5. Moges B. Wagena & Andrew Sommerlot & Anteneh Z. Abiy & Amy S. Collick & Simon Langan & Daniel R. Fuka & Zachary M. Easton, 2016. "Climate change in the Blue Nile Basin Ethiopia: implications for water resources and sediment transport," Climatic Change, Springer, vol. 139(2), pages 229-243, November.
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