Impact of Land-Use/Land-Cover Changes on Land Surface Temperature in Arsi Zone, Eastern Ethiopia

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Addis Ababa University


Impact of Land-Use/Land-Cover Changes on Land Surface Temperature in Arsi zone, Eastern Ethiopia Morka Abebe, Msc. Thesis Addis Ababa University, May 2018 Unmanaged Land-use/land-cover change is one of the main environmental problems and challenges, which strongly influences the process of urbanization and agricultural development. The world has faced with the problem of overwhelming increase in land surface temperature (LST) as compared from year to year. The present study has investigated the impact of land-use/land-cover (LU/LC) change on LST in administrative zone in Ethiopia. The research was conducted in Arsi zone, located in Oromia region, Eastern Ethiopian. Land-use/land-cover, LST and NDVI were extracted from Landsat TM (1997) and Landsat 8 OLI/TIRS (2017) using GIS and remote sensing tools. Land surface temperature was done using split window algorism. Changes in LU/LC, which occurred between 1997 and 2017 in the study area was evaluated and analyzed using geospatial tools and verified against field data. The result of LU/LC change indicated that farmland covered more than 40% during the study periods (1997–2017) and followed by shrub land covering more than 37%. The study indicated that most areas having lower LST in 1997 were changed to higher LST in 2017.This happened due to the increased in different LU/LC changes especially attributed to the decreasing of vegetation cover in the study area. By linking the LU/LC classes and LST parameter using zonal statistics as figure, it has been found that, LST has negative correlation with vegetation cover. Land surface temperature result showed that the eastern and some north western parts of the study area exhibited relatively higher temperature. This is mainly due to altitude, slope and LU/LC types and changes. On the other hand, the central parts and around mountains Chilalo,Kaka and Gugu area exhibited relatively low LST values ranging from 5.11°C to 9.02°C. This is mainly due to high NDVI value or denser vegetation cover. While the eastern and some north western part has high LST value reaching up to 44.90ºC. Therefore, the visual comparison of 1997 and 2017 images showed that the LU/LC type and NDVI status and condition play a major role in variability of LST values. Continuous land-use/land-cover change may not be stopped easily. However, different measures have to be taken by environmental experts and the concerned bodies to minimize the influence of changes in the LST on environments. This study showed that geospatial tools and techniques can give fast and reliable results for evaluating LST increases and variability at regional scale and its impact on the environment in a shorter analysis and evaluation.



LU/LC, LST, NDVI, Landsat Image, GIS, Remote Sensing