Human Induced Impact on the Land Surface Temperature Dynamics of Obio/Akpor Local Government Area of River State, Nigeria

  • Chigozi Wali Bethel University of uyo campus, uyo akwa ibom state, nigeria, Nasrda-Advanced Space Technology Applications Laboratory Uyo, Akwa Ibom State
  • Joy Bethel-wali Ugochi Nasrda-Advanced Space Technology Applications Laboratory Uyo, Akwa Ibom State
  • Magnus Nwaigwe Nasrda-Advanced Space Technology Applications Laboratory Uyo, Akwa Ibom State.
  • Charles Oguche Nasrda- Centre For Basic Space Science Nsukka, Enugu State.
  • Joshua Ezugwu Nasrda-Advanced Space Technology Applications Laboratory Uyo, Akwa Ibom State.
  • Dr. Kenneth Uchua. A Nasrda-Advanced Space Technology Applications Laboratory Uyo, Akwa Ibom State.
Keywords: Human impacts, Land surface temperature, Nigeria, land use/land cover, NDVI, Landsat images

Abstract

This research is aimed at evaluating influence of human activities on the land surface temperature of Obio/Akpor L.G.A of River State. land surface temperature (LST) is the temperature of the skin surface of a land which can be derived from the satellite information or direct measurements in the remote-sensing terminology. Land surface temperature dynamics, land use land cover dynamics and the relationship between land surface temperature (LST) and land-use land-cover (LULC) were assessed using Landsat satellite data (ETM+ and OLI/TIRS) of Obio/Akpor in River State, Nigeria. The radiometric corrected thermal infrared bands of the Landsat images of 2000 and 2020 were used Calculate NDVI, extract proportion of vegetation, (Emmisivity) for calculating and retrieving the land surface temperature of the study area while the Maximum Likelihood algorithm in Erdas imagine 9.2 was used to generate a classified image for the two periods. Land surface temperature maps, land cover index maps and Normalized Differential Vegetation Index (NDVI)) were generated. Correlation analysis using Pearson’s Product Moment Method was carried out between land surface temperature and normalized differential vegetation index (NDVI) data and the land cover index was digitized and overlaid on the LST map of 2020 to determine the association between them. The results revealed noticeable decrease in vegetated areas of Obio/Akpor with an accompanying increase in land surface temperature from 32.6°C in 2000 to 36.2°C in 2020. Built-up increased within the same periods from 75.59 square meters to 157.84 square meters, which could be attributed to anthropogenic activities. The land surface temperature distribution maps showed a more pronounced intensity in areas of significant human activities than in areas covered by vegetation and waterbody. correlation coefficient values of –0.85351 and -0.87513 were observed in the land surface temperature and normalized differential vegetation index values for 2000 and 2020 respectively, verify this indicated an inverse relationship between the two variables showing that areas with highest value of LST, recorded low value of NDVI. The study concluded that the nature of land use / land cover patterns in Obio/Akpor have impacted its land surface with a corresponding increase in land surface temperature. It is expected that as the city expands further, the magnitude of the land surface temperature will also increase thereby affecting the living conditions of the urban populace

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Published
2020-10-17
Section
Articles