October 4, 2023 Thesis Open Access

Eshetu Diriba MULUGETA

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Eshetu Diriba MULUGETA</dc:creator>
  <dc:date>2023-10-04</dc:date>
  <dc:description>Nowadays demand for water utilization alarmingly increasing in worldwide among these groundwater plays a vital role as it directly or indirectly supports domestic, agriculture and industrial activities purposes. However, due to natural and anthropogenic factors the watersource declinesfrom time to time this call for resource assessment and charcterzation. Despite the fact, lvery limited research based documented information on groundwater potential and quantified seasonal and annual, evapotranspiration, surface runoff and recharge in whichthis gaps results lack of awareness on the resources and limited data supported planner, policy makers, investment and other stockholders in Bale Zone Genale-Dawa sub basin. The purpose of the present study was conducted for groundwater potential mapping and recharge estimation using geospatial techniques and WetSpass model for Bale Zone, Genale-Dawa subbasin, Southeastern Ethiopia. The study was conducted with the objective to assess factors that determine groundwater potential and develop groundwater potential zone using geospatial technique and through an analytical hierarchal process (AHP) method as well as also seasonal and annual recharge estimate using WetSpass model. In materials and methods satellite imageries and others data were used to generate various thematic layers, namely rainfall, geomorphology, land use land cover, lithology, soil texture, slope, topographic wetness index, elevation, drainage density, lineament density and groundwater potential. All factors weights and ranks were assigned based expert judgment, reviewed of literature and field survey experience as per their contributions for groundwater potential and the corresponding normalized weights were obtained AHP methods. In order to run the WetSpass model for recharge estimated hydro-meteorological data and biophysical data were adjusted into summer (June to September) and winter (October to May) season as per the model requirement. The results of groundwater potential map generated using geospatial techniques and AHP methods revealed that very low (16.58 %), low (24.36%), moderate (18.09%), high (18.53%) and very high class (22.44%). The very low and low groundwater potential zones area might be due to the results of volcanic landform, bare lands, high slope and high drainage density.The WetSpass model output shows that the values ranged from 106.35 to 186.46 mm (39.16%); 279.90 to 409.77 mm (51.83 %) and 428.80 to 596.54 mm (35.28%) for evapotranspiration, surface runoff values varied from 0 to 409.78 mm (15.23%), 0 to 470.15 mm (5.95%) and 1.44 to 876.48 mm (6.71 %) whereas simulated recharge vared from -52.278 to 406.09 mm (45.57 %), 0 to 543.67 mm (41.12 %) and 0 to 936.02 mm (32.10%) for summer, winter and annual season; respectively were obatined. The results of current studied supports as a preliminary reference to enable exploration of groundwater wells understand groundwater resources status and adopted sustainable management in the area. It can be concluded that the result geospatial technique and MCDA as well as seasonal and annual recharge estimated using WetSpass model are promising and efficiently to recognize the groundwater potential and recharge zones identification over other techniques. It should be recommended that the mapped groundwater potential zone further validated based on through well drilling, detail hydrochemistry analysis and further groundwater quality research should be recommended.4
 </dc:description>
  <dc:identifier>https://zenodo.org/record/10451</dc:identifier>
  <dc:identifier>10.20372/nadre:10451</dc:identifier>
  <dc:identifier>oai:zenodo.org:10451</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>doi:10.20372/nadre:10450</dc:relation>
  <dc:relation>url:https://nadre.ethernet.edu.et/communities/mwu123-un</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:subject>Remote sensing, GIS, groundwater Potential, groundwater factors, AHP, WetSpass Model, recharge, Water Balance; Genale Dawa, Bale Zone</dc:subject>
  <dc:title>GROUNDWATER POTENTIAL MAPPING AND RECHARGE ESTIMATION USING GEOSPATIAL TECHNIQUES AND WETSPASS MODEL FOR BALE ZONE, GENALE DAWA SUB-BASIN, SOUTHEASTERN ETHIOPIA</dc:title>
  <dc:type>info:eu-repo/semantics/doctoralThesis</dc:type>
  <dc:type>publication-thesis</dc:type>
</oai_dc:dc>