Application Of Geophysical Methods To Delineate Fresh Water Saline And Water Zones In Amibara Irrigation Farm Lands Amibara Eastern Ethiopia

With the aim to mapping the saline and fresh water interface and verifying the application ofrngeophysical methods to study problems of salinity at the Amibara irrigation farm; electricalrnmethods were applied over two parallel traverses.rnThe methods employed included Schlumberger sounding surveys at ten YES points on therntwo traverses with YES points spacing of 450 meters to 1100 meters and dipole-dipole surveysrnover four profiles of approximate length of 250 meters over the same two traverses. The dipolernsurveys were carried out with three levels expected to give depth of investigations of about 5, 7.5rnand to meters.rnThe results of these field surveys are interpreted and presented in the form ofrngeoelctricsections and pseudo sections. A general geological section of the survey area is givenrnfrom the interpretation of the sounding data.rnThe results have clearly mapped the different geologic horizons of the subsurface andrndelineated areas of low resistivity due to effects associated with highly saline formation fluids.rnThe work has verified the effectiveness of the electrical methods of prospecting inrnstudying problems associated with salinity and shows the potential of these methods in planningrncurrent and near future farm land utilization and monitoring of current pilot desalinationrnprogrames.rnSurveys carried out over properly selected sample areas could minimize the cost ofrnobtaining such information from expensive piezometric wells and soil test pits

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