Analysis of Spatial and Temporal Variation of Land Use/Land Cover and Impacts on Climate in Urban Areas, Sri Lanka with Special Reference to Hambantota Divisional Secretariat Division (2008-2019)

International Journal of Research and Innovation in Social Science (IJRISS) | Volume V, Issue XI, November 2021 | ISSN 2454–6186

Analysis of Spatial and Temporal Variation of Land Use/Land Cover and Impacts on Climate in Urban Areas, Sri Lanka with Special Reference to Hambantota Divisional Secretariat Division (2008-2019)

Edirisooriya K V U I¹, Senevirathna E M T K², Edirisooriya K V D³, Dheerasinghe G W M M K⁴, Dauglas D L P M^5
1,4 Department of Oceanography and Marine Geology, University of Ruhuna, Sri Lanka
^2,3 Department of Geography and Environmental Management, Sabaragamuwa University of Sri Lanka
⁵ Geological Survey and Mines Bureau, Sri Lanka

Abstract- The changes in air temperature with the land use / land cover (LU/LC) in the certain areas highly affect to the environment and its ecosystem. This study aims to evaluate LU/LC changes and their impacts on climate in Hambantota Divisional Secretariat Division from 2008 to 2019. Both LU/LC cover changes were determined by using supervised classification, particularly maximum likelihood classification and accuracy assessment in Remote Sensing and GIS techniques. Spatial distribution of air temperature is determined by Inverse Distance Weighting (IDW) method by assigning values to unknown points are calculated with a weighted average of the values available at the known points. The results found that the increment of built-up areas (27.66%), water bodies (2.39%) and agriculture (0.44%) and decrement of barren lands (11.61%) and forest cover (18.88%) having accuracy ranged from 86.7 percent to 83.3 percent with 0.888 to 0.912 Kappa statistics. These changes are further confirmed by the Normalized Different Vegetation Index (NDVI). Moreover, the increment of air temperature is detected during 11 years. This air temperature increment is proportional to the forest cover reduction and the buildup area increment due to vast developments in the area after 2009.

Keywords- Land use / land cover, remote sensing, supervised classifications, air temperature, maximum likelihood, climate

I. INTRODUCTION

Land use/ Land cover (LU/LC) changes in emerging cities have several negative consequences for both city residents and the environment. Understanding the nature of land change is therefore critical for city development planning. LU/LC changes are two separate terminologies which are often used interchangeably [1]. Land use is the manner in which human beings employ the land and its resources. Examples of land uses include agriculture, urban development, grazing, logging, and mining. In contrast, the land cover describes the physical state of the land surface. Land cover categories include cropland, forests, wetlands, pasture, roads, and urban areas [2].

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