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    Hydro-geomorphological features at gully heads in the humid northern Ethiopian Highlands, Birr Watershed

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    Authors
    Addisie, Meseret B.
    Ayele, Getaneh K.
    Gessess, A.A.
    Tilahun, Seifu A.
    Moges, M. M.
    Schmitter, Petra S.
    Steenhuis, Tammo S.
    Date Issued
    2015
    Language
    en
    Type
    Conference Paper
    Accessibility
    Limited Access
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    Citation
    Addisie, M. B.; Ayele, G. K.; Gessess, A. A.; Tilahun, S. A.; Moges, M. M.; Schmitter, Petra S.; Steenhuis, T. S. 2015. Hydro-geomorphological features at gully heads in the humid northern Ethiopian Highlands, Birr Watershed. Paper presented at the 3rd International Conference on the Advancements of Science and Technology [ICAST], Bahir Dar, Ethiopia, 8-9 May 2015. 7p.
    Permanent link to cite or share this item: https://hdl.handle.net/10568/75751
    Abstract/Description
    The study was conducted in the Birr watershed at twelve gully heads located close to each other. The survey includes measurements of morphological features, soil properties, water table elevations and catchment characteristics including erosion at each gully head. The analysis showed that gully head morphology could be explained by the role of different gully head controlling factors. The result suggested the maximum rate of head cut retreat reaches from 0 to 22.5m. There was no head retreat recorded from the arrested heads relative to unprotected heads. Compared to semiarid highlands of northern Ethiopia, the average short term head cut retreat was 12 fold greater. From the direct shear test, angle of internal friction by far greater than the slope of gully heads which are located at flat lands. The width depth ratio showed that the shallow depth heads were controlled by fluvial erosion whereas for the deep gully heads both fluvial and mass wasting due tension cracks are operating. In this study a significant power relationship established between the volume of the gully head and the length of retreat at the active gullies with V = 4.85 L1.05 (R2 = 0.91 and P= 0.042) which is different from the relation obtained from the entire gully system as a result of varies controlling factors.
    Other CGIAR Affiliations
    Water, Land and Ecosystems
    AGROVOC Keywords
    hydrogeology; geomorphology; morphology; humid zones; highlands; watersheds; water table; soil properties; gully erosion; landscape; case studies
    Countries
    Ethiopia
    Regions
    Eastern Africa
    Collections
    • IWMI Conference Chapters or Papers [1045]
    • Land and Water Productivity [412]

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