Browsing by Author "Jayarathne, E.G.M."

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    The human effects on dry mixed evergreen forest cover surrounding the Village-based irrigation system in Sri Lanka
    (Faculty of Graduate Studies, University of Kelaniya, 2015) Ranaweera, R.A.D.; Jayarathne, E.G.M.
    Natural vegetation is vastly different from the land escapes that make up various types of forests. Dry mixed evergreen forest (DMEF) can be seen around the village based irrigation systems (VBIS) in the dry zone of Sri Lanka. The main human impact of dry mixed evergreen forest in shifting and burning cultivation. This is increased since 1980. However, this research investigated the major impacts of human activities on dry mixed evergreen forest cover in Sri Lanka. A total of 40 households were face to face interviewed for primary data collection in Mahakanadarawa Grama Niladari Division in the Mihinthale Divisional Secretariat Division. The data analyzed from descriptive statistics and also used starlight images for comparing land use pattern. The research confirmed that shifting and burning cultivation as a major impact in DMEF. Furthermore it is revealed that there in a negative relationship between educational level and employment. Land disintegration also observed as a contributing for in the reduction of DMEF. The Chena cultivation must be manage with providing alternative employment opportunities before its getting into the alarming lived of destruction of DMEF.
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    The Spatial Changes in Water Quality in the Upper Stream of the Polgolla Reservoir Catchment
    (Research Centre for Social Sciences, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2016) Jayarathne, E.G.M.
    Polgolla Reservoir Catchment (PRC) is distributed in the Upper Mahaweli River basin, Central Province of Sri Lanka. The catchments of Major Rivers in Sri Lanka are being polluted due to various factors that made by human intervention for development. Therefore it is indispensable to explore the current level of water quality in the river catchments areas, which feed major water courses providing surface water for the people. PRC is the one of importance catchment area in Mahaweli river basin. The main objective of my study was to determine the processes and factors affecting the water quality changes in the sub catchment PRC using Geospatial technology. The data was collected on eight water quality parameters, in the ten locations, which are selected purposively at different elevations in the catchment and analyzed using Contour layers. The water quality spatial variation map was prepared by using IDW and weighted overlay tools in Arc GIS. The final map shows the high, moderate and low polluted areas of the PRC.