Structural Control on Ground Water Dynamics in Gur River Catchment of Jema River Sub-Basin at Middle Blue Nile Basin in Central Ethiopia
No Thumbnail Available
Date
2018-06-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
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.
Description
Keywords
Geological Structure, Lineament Orientation, Groundwater Flow, , Controls Gur River Catchment