Integrated Geophysical Investigations For Mapping Possible Inflow Of Water From Merti-fentale Irrigation Canal Into Lake Beseka Metahara Area Eastern Ethiopia

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This manuscript presents a master’s thesis work dealing with an integrated geophysical,rnmagnetic and electrical resistivity tomography, survey conducted as part of a systematicrninvestigation to understand the mechanisms for Lake Beseka’s level rise, its mitigationrnactions and its impact in Metahara area, eastern Ethiopia. The geophysical surveyrnparticularly aims at investigating the possible inflow of fresh water into the Lake Besekarnfrom the Merti-Fentale irrigation canal.rnQualitative interpretation of the total field magnetic data along four profiles showed thernpresence of structures, which could act as paths for fresh water to recharge the lake. Onrnthe other hand, appraisal of five traverse lines of electrical imaging data revealed that thernarea is covered by low resistivity response region at shallow depths which are believed tornresult from water saturated silty clay and welded tuff subsurface horizon. Relativelyrnmedium and high resistivity responses resulting from weathered scoria, scoracious basalt;rnfine and coarse grained basalt are also mapped.rnThe current results of the integrated methods of electrical imaging and magnetic havernshowed good correlations, reduced the ambiguity inherent in the geophysical datarninterpretations, and highlight the fractured systems oriented NW-SE, E-W and NE-SWrndirections. These structures are seen to be extending to a larger depth and potentially actrnas conduits for the fresh water which come from the Merti-Fentale canal to recharge LakernBeseka.rnAs a further conclusion from the work, it is suggested that the amount of water which isrndistributed into the farmland must be in controlled manner. The land is highly fracturedrnand water saturation arising from the secondary and tertiary canals, which are extendingrnup to the lake periphery, are expected to be the causes for the rise in lake level

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Integrated Geophysical Investigations For Mapping Possible Inflow Of Water From Merti-fentale Irrigation Canal Into Lake Beseka Metahara Area Eastern Ethiopia

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