Investigation of the changing patterns of the land use land cover over Osogbo and its environs.

Emmanuel Olaoluwa Eresanya,Mojooluwa Toluwalase Daramola,Olufemi Sunday Durowoju,Peace Awoyele

doi:10.1098/rsos.191021

Abstract

The progressive nature of urbanization plays a prominent role in land–atmosphere processes, which have corresponding impacts on the general environment. This research investigated the changing patterns of the land use land cover over Osogbo and its environs using remote sensing data obtained from Landsat TM, ETM+ and OLI/TIRS sensors. The changes in four land use classes were assessed for the years 1984, 2000 and 2015. The land surface temperature (LST) of the area was estimated from the satellite images covering the study periods, and the surface urban heat island (SUHI) process was also investigated between the city of Osogbo and the surrounding towns. The results showed major urban expansion leading to urban sprawl within the vicinity. Urban area increased by 5106 ha while vegetation decreased by 8653 ha between 1984 and 2015 indicating major variations in the land surface features. This was revealed by the increase in the LST over the locations which ranged between 22.6°C and 30°C (mean, 25.2°C) in 1984 and between 29.3°C and 36.7°C (mean, 31°C) in 2015. The highest SUHI intensity was observed between the major urban area (Osogbo) and least developed towns. The continuous increase in the surface temperature of the environment due to the continuous variations in the land surface properties implies increased risk of heat-related environmental issues such as deterioration of thermal comfort conditions.

Highlights

The world is undergoing the most tremendous and influential urban growth in the history of mankind
Its benefits include easy and quick access to basic social amenities such as quality education, medical services, electricity and water supply, and better economic and job opportunities, while its severe impacts may include forfeiture of agricultural land [4], habitat destruction which breaks down ecological cycles [5,6], the effects of urban heat island (UHI) [7,8,9], and contamination of air, soil and water [10]
The land surface temperature (LST) increased over all the towns between 1984 and 2015 as a result of growing infrastructure and increased human activities

Summary

Introduction

The world is undergoing the most tremendous and influential urban growth in the history of mankind. United Nations (UN) Centre for Human Settlements [2] predicted that by 2030, about 5 billion people would be residing in urban areas; this is expected to influence and have serious impacts on the social–economic and environmental transformations across the continent of Africa and Asia. Its benefits include easy and quick access to basic social amenities such as quality education, medical services, electricity and water supply, and better economic and job opportunities, while its severe impacts may include forfeiture of agricultural land [4], habitat destruction which breaks down ecological cycles [5,6], the effects of urban heat island (UHI) [7,8,9], and contamination of air, soil and water [10]. Due to built-up environment, cities create their own microclimate, which generally enhances the effects of global climate change

Results

Discussion

Conclusion