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Jimma University (2016)

Land Use and Land Cover Dynamics in Lower Awash Rangelands, Ethiopia

Wondimagegnehu Shibru

Titre : Land Use and Land Cover Dynamics in Lower Awash Rangelands, Ethiopia

Auteur : Wondimagegnehu Shibru

Université de soutenance : Jimma University

Grade : Master of Science in Natural Resource Management (Watershed Management) 2016

Résumé partiel
Change detection is one of multi temporal analysis in remote sensing that is important for studying the dynamics of environment. Change detection is useful in many applications such as land use changes, habitat fragmentation, rate of deforestation, coastal change, urban sprawl, and other cumulative changes through spatial and temporal analysis techniques such as GIS and Remote Sensing along with digital image processing technique. The objective of this study was to estimate the spatiotemporal changes pertaining to land use land cover (LULC) ,the driving forces behind these changes and its impact on the biodiversity and the livelihood of pastoralists in Lower Awash Range Lands. An integrated approach utilizing remote sensing and geographic information system (GIS) was used to extract information pertaining to LULC change. Satellite images of LandSat TM 1986, LandSat ETM+ 2001 and LandSat ETM 2014) were used. In addition, individual interviews with 134 randomly selected households, discussions with focus group and key informants, and field observations were also incorporated for the study. All images were classified using object-based image classification technique. Accuracy assessments were conducted for 2014. Change analysis was carried out using post classification comparison in GIS. LULCs were successfully captured with overall accuracies 88.52% and Over all Kappa value of 0.87. When the 2014 LU/LC classification compared with 1986 LU/LC classification, there were changes that showed decrease or increase in particular land use land cover. The land use land cover categories, which showed increments are bush land, irrigation land, water body, built up area and bare land have increased by 21448.64 ha (+27.24 % ) 4665.9 ha (+43.81%) 50.87 ( + 108.93%) 8825.93ha ( +786.91% ) and 32208.8 ha ( +57.40%) respectively. On the other hand shrub land and grass land decreased by 9637.1ha (-51.67%) and 57563 ha (-94.42%) respectively

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