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All Journal Journal of Degraded and Mining Lands Management
Wickramasinghe, Deepthi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Analyzing land use changes and wetland dynamics: Muthurajawela urban wetland and its surroundings, Sri Lanka Dahanayake, Harsha Dias; Dahanayaka, DDGL; Hudson, Paul; Wickramasinghe, Deepthi
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6441

Abstract

Land Use and Land Cover changes (LULC) exert a substantial influence on human life and environmental well-being. This research utilized the Intensity Analysis (IA) method to assess LULC change intensities spanning from 2000 to 2021 in the Muthurajawela coastal wetland (MW) and its 5km buffer zone (MB) along the west coast of Sri Lanka. The research employed Landsat Thematic Mapper (TM) and Optical Land Imager (OLI) Remote Sensing Images. The supervised classification was used to accurately identify waterbodies, thick vegetation, other vegetation, settlements, and open areas with an average of 86% accuracy. The study revealed that the MW experienced a fast Interval level intensity shift during 2000-2010, followed by a slower pace during 2010-2021. Conversely, the MB displayed a consistently fast Interval level intensity throughout both time intervals. Notably, waterbodies in MW decreased by 19.6%, while settlements witnessed a gain of 19.1% over the entire period. Transition Level (TL) analyses underscored the transformation of water bodies to open areas (6.75% in 2000-2010) and open areas to settlements (5.38%). In MB, other vegetation saw a significant decrease of 33.7%, with settlements registering a notable increase of 39.4% over the entire period. The study emphasizes urgent action for sustainable land use development in the face of rapid urbanization within the study area.
Do natural landscapes contribute to reducing Land Surface Temperature (LST)? A case study from Muthurajawela wetland, Sri Lanka Dahanayake, Harsha; Wickramasinghe, Deepthi; Dahanayaka, DDGL
Journal of Degraded and Mining Lands Management Vol. 9 No. 2 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.092.3329

Abstract

Microclimate regulation is one of the most significant ecosystem services provided by wetlands. The present study attempted to investigate the cooling effect provided by Muthurajawela, a coastal Ramsar wetland using Remote Sensing and GIS.  The variation of Land Surface Temperatures (LST) over different land use categories of natural (water bodies, marsh, thick vegetation, grassland) and anthropogenic (built-up areas, coconut cultivations and bare lands) areas in 2015 and 2020. Parameters including Satellite Brightness Temperature, Normalized Difference Vegetation Index, Proportion of Vegetation and Land Surface Emissivity were calculated along eight transects starting from the center of the water body and extending up to 5 km from the boundary of the wetland. The results revealed that LST over areas under natural land cover (2015 - mean 25.040C, 2020 - mean 23.360C) were significantly lower than that of areas under anthropogenic influence (2015 - mean 26.520C and 2020 - mean 26.220C). The lowest increase of LST was over the water body and the highest was over the built-up areas indicating the buffering capacity of wetlands. As air temperatures are highly linked to LST, our findings suggest that wetlands contribute to lower atmospheric temperature and offer cooling effects during dry months. Acknowledging the importance of wetlands in reducing temperature, at least in a local scale, justifies the need of conserving these ecosystems, as seeking mitigatory measures for climate change driven frequent heating effects is challenging.
Co-Authors Dahanayaka, DDGL Dahanayake, Harsha Dahanayake, Harsha Dias Hudson, Paul