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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2288

Title: GROUND WATER POTENTIAL EVALUATION BASED ON INTEGRATED GIS AND REMOTE SENSING TECHNIQUES, IN BILATE RIVER CATCHMENT: SOUTH RIFT VALLEY OF ETHIOPIA
Authors: Tesfaye, Tessema Gintamo
Advisors: Prof. Tenalem Ayenew
Keywords: thematic maps
western escarpment
GIS and remote sensing
Groundwater potential
Bilate River
Copyright: Jun-2010
Date Added: 3-May-2012
Publisher: AAU
Abstract: Groundwater is occurring within different hydrogeology environment, geologic formations and topographic settings that the factors mainly control the groundwater distribution and development for different purposes. A systematic evaluation of groundwater is essential for the proper utilization and management of this precious natural resource. Integrated GIS (geographic information system) and remote sensing are efficient techniques in groundwater studies; in facilitate better data analysis and their interpretations of groundwater potential controlling parameters. In the present study, an attempt has been made to delineate and classify possible groundwater potential zones in the Bilate River catchment of the south Ethiopian rift escarpment, found in SNNPR using integrated remote sensing and GIS techniques. The thematic layers considered in this study are lithology, geomorphology/landform, drainage density, lineament density, rainfall, soil, slope and land use/ land cover were prepared using the Landsat ETM+ imagery and ArcGIS software. All the thematic layers were then assigned weights according to their relative importance in groundwater occurrence and the corresponding normalized weights were obtained based on the Saaty's analytical hierarchy process. These weights were applied in linear summation equation to obtain a unified weight map containing due weights of all input variables. The thematic layers were finally integrated using ArcGIS and IDRIS software to produce a groundwater potential zone map of the study area. Thus, four different groundwater potential zones were identified, namely 'high, 'moderate’,' low’ and 'poor'. The high potential zones correspond to alluvial plains, lacustrine sediments, the fracture valleys, and valley fills, which coincide with the low slope and high lineaments density areas .The eastern portion and some small patches in the northern and valley escarpment of Bilate River of the study area fall under moderate groundwater potential zone. The low zones mainly comprise structural hills and escarpments which contributes high run-off .On the other hand, Poor groundwater potential zones are present in the mountain peaks, plateaus and escarpments with steep cliff, where low fractured undifferentiated peralkaline Dino formation, obsidian and pitch stone exist. The resulted groundwater potential zoning map validated based on existing water sources point data of the study area. Finally, it is concluded that the integrated GIS and remote sensing techniques are very efficient and useful for the identification of groundwater potential zones.
URI: http://hdl.handle.net/123456789/2288
Appears in:Thesis - Earth Sciences

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