Browsing by Author "Azagegn, Tilahun (Dr)"

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    Structural Control on Ground Water Dynamics in Gur River Catchment of Jema River Sub-Basin at Middle Blue Nile Basin in Central Ethiopia
    (Addis Ababa University, 2018-06-01) Ashenafi, Bekelech; Azagegn, Tilahun (Dr)
    In Central Ethiopia, The Structural Control On Ground Water Dynamics In Gur River Catchment Of Jema River Sub-Basin At Middle Blue Nile Basin Have Been Investigated To Characterize The Ground Water Flow Direction And Lineaments Orientation. The Development Of Ground Water Contour Map, Lineament Orientation And Flow Direction Is Based On The Interpretation Of Water Level Data And From Field Measurement Data Of Attitude (Strike) Were Plotted On Rose Diagram Respectively. Lineaments Were Extracted From DEM Using Geomatica Software Mapped Using Kriging Interpolation Tools In Arc GIS 10.3. The Geological Structure And Regional Fault System From NW-SE Trending Horst Beneath Volcanic Rock Unit And Ridges Control The Aquifer Distribution In The Catchment. The Lineament Density Is High On Lithologic Unit Of Sedimentary Rock Unit, But There Are Thin Beds Of Mudstone And Shale Intercalation With Upper Sandstone Domes Are Affected By Fractures And Faults, They Form Groundwater Flow Barriers. The Volcanic Rock Unit Is Highly Fractured And Jointed With Major Lineament Orientation N-S, E-W, And NE-SW Direction. In Sedimentary Rock Due To High Deep Gorge Which Is Strongly Disturbed By Geological Structure With Varying Attitude Act As Low Permeability Boundaries. Hence Geological Structure And Attitude Influenced On Ground Water Storage And Dynamics By Hindering or Deflected Ground Flow Direction. Therefore the Fractures And Joints Act As Conduit Though Which Ground Water Flow or Barrier.