Integrated Geophysical Investigations for Mapping Possible Inflow of Water from Merti-Fentale Irrigation Canal into Lake Beseka, Metahara Area, Eastern Ethiopia

Addisu, Haile Tedla (2014) Integrated Geophysical Investigations for Mapping Possible Inflow of Water from Merti-Fentale Irrigation Canal into Lake Beseka, Metahara Area, Eastern Ethiopia. Masters thesis, Addis Ababa University.

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Abstract

This manuscript presents a master’s thesis work dealing with an integrated geophysical, magnetic and electrical resistivity tomography, survey conducted as part of a systematic investigation to understand the mechanisms for Lake Beseka’s level rise, its mitigation actions and its impact in Metahara area, eastern Ethiopia. The geophysical survey particularly aims at investigating the possible inflow of fresh water into the Lake Beseka from the Merti-Fentale irrigation canal. Qualitative interpretation of the total field magnetic data along four profiles showed the presence of structures, which could act as paths for fresh water to recharge the lake. On the other hand, appraisal of five traverse lines of electrical imaging data revealed that the area is covered by low resistivity response region at shallow depths which are believed to result from water saturated silty clay and welded tuff subsurface horizon. Relatively medium and high resistivity responses resulting from weathered scoria, scoracious basalt; fine and coarse grained basalt are also mapped. The current results of the integrated methods of electrical imaging and magnetic have showed good correlations, reduced the ambiguity inherent in the geophysical data interpretations, and highlight the fractured systems oriented NW-SE, E-W and NE-SW directions. These structures are seen to be extending to a larger depth and potentially act as conduits for the fresh water which come from the Merti-Fentale canal to recharge Lake Beseka. As a further conclusion from the work, it is suggested that the amount of water which is distributed into the farmland must be in controlled manner. The land is highly fractured and water saturation arising from the secondary and tertiary canals, which are extending up to the lake periphery, are expected to be the causes for the rise in lake level.

Item Type:	Thesis (Masters)
Subjects:	Q Science > Q Science (General) Q Science > QE Geology T Technology > TC Hydraulic engineering. Ocean engineering
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	18 Jun 2018 14:09
Last Modified:	18 Jun 2018 14:09
URI:	http://thesisbank.jhia.ac.ke/id/eprint/4486

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