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Impacts of Land Use and Land Cover Change on Soil Erosion in Arjo Dedessa Sub Watershed, East Wellega Zone, Oromia Regional State, Western Ethiopia

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dc.contributor.advisor Argaw, Mekuria (PhD)
dc.contributor.author Tesfaye, Degefa
dc.date.accessioned 2019-11-13T05:53:25Z
dc.date.available 2019-11-13T05:53:25Z
dc.date.issued 2019-04-02
dc.description.abstract LULC changes and land degration risk has become one of the most important ecological issues and their impacts on natural resources have gained increased attention at global level.The main objective of this research is to assess the temporal impacts of LULCCs to estimate average annual soil loss and to identify the soil severity losses and piorities areas within the sub-watersheds that needs urgent attentions for the protection and conservation practices. And also to identifying the erosion risk areas in producing erosion map by using RUSLE models in the study areas.The satellite image data,RS and GIS tools were used for the LULC classification detection and shown their maps.The RUSLE parameters were analyzed and overlain using raster calculator in Arc-GIS 10.3 environment to estimate erosion rate and map erosion risk areas.The result showed that both cropland and human settlements had expanded with 4,376 ha and 7,212 ha .But the expansion is not continuous and the waterbody increased by 1,425 ha over the period.On the other hand, both forestland and grasslands were reduced greatly at varying rates of change per annum.They were reduced by 3,992 ha and 9,022 ha over the period of study.The result showed that the soil losses from less than 10t/ha/yr to more than 100t/ha/yr in the steep slope areas of the study area.The estimated soil loss for the study area ranges from the zero to 143t/ha/yr with the mean annual soil loss of 18.63t/ha/yr.It was also divided into different sub-watersheds and five erosion classes were categorized.The risk areas were prioritized for soil conservation interventions. In this study, the expanded in cropland, human settlement and water body areas, while both forest land and grasslands were reduced at largely.The RUSLE model factors showed as the soil loss rate of the study area was ranged from zero to 143 t/ha/yr with the mean annual soil rate of 18.63t/ha/yr. Therefore, land use and land cover changes and their impacts on soil erosion are very vital to sustain and plan appropriate for soil conservation strategies due to the land use. en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Soil Erosion en_US
dc.subject Lulccs en_US
dc.subject GIS en_US
dc.subject RS and RUSLE Models en_US
dc.subject Arjo Dedessa Sub-Watershed en_US
dc.title Impacts of Land Use and Land Cover Change on Soil Erosion in Arjo Dedessa Sub Watershed, East Wellega Zone, Oromia Regional State, Western Ethiopia en_US
dc.type Thesis en_US

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