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The Impacts of Population Growth on the Land use Changes in Batticaloa Municipal Council, Sri Lanka

100%
Mathanraj S.
World News of Natural Sciences
|
2020
|
vol. 32
36-48
EN
Urbanization is a new development of city centres within its original boundaries to satisfy a growing population. Today, rapid population growth collapses the land use pattern due to the developments of housing and infrastructure. This study aims to identify the impacts of population growth on land-use changes in the Batticaloa Municipal Council. Various methods were used to interpret and analyze the maps, such as the supervised maximum likelihood classification, density analysis, and Pearson's correlation coefficient analysis. The results revealed that a high population density was identified near the core city, which decreases from the city centre to the city limits. Commercial and residential categories strongly correlated with population growth, and agriculture mostly closed at a significant level. Rest categories were insignificant with population growth. Thus, land use planning should be implemented to control the effects on land use.
2
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GIS Based Flooding Analysis Kaluwanchikudy DS Division

63%
Mathanraj S., Kaleel M. I. M.
|
EN
The major objective of this study is to identify the flood severity level of the study area using GIS applications. By employing this map, safer habitation zones were established. Direct personal observation and face-to-face interview was done to gather the primary data and Disaster Management center reports, Census reports of Sri Lanka, images and published research reports were used as secondary data. The severity level of flooding in this area was analyzed using SRTM imagery in ArcGIS and overlaid on a Google Earth pro map. The findings of the study established that the highly affected area consisted of around 8.953003 sq·km, the moderately affected area was around 9.190781 sq·km and the lowly affected area was approximately 9.31039 sq·km within the study area. The major causes for flood disaster in this area are the lack of drainage systems in some potential flood regions, the low landscape, poorly maintained drainage systems and the geographical arrangement of the road network. By creating this map, the inhabitants will be aware of danger areas and can relocate accordingly [3, 5-9].
3
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Rainfall Variability in the wet-dry seasons. An analysis in Batticaloa District, Sri Lanka

63%
Mathanraj S., Kaleel M. I. M.
World News of Natural Sciences
|
2017
|
vol. 9
71-78
EN
Rainfall is of primary importance to both the physical and cultural landscape of any region. The objective of this study is to find the trends for rainfall variability on climate change in Batticaloa District of Sri Lanka, by analyzing 146 years of monthly data of rainfall received during the period 1869-2014 from the meteorological station of the Department of Meteorology. Some studies attribute extreme events to rainfall variability due to climate change induced by global warming. However, there is a dearth of climatological studies addressing the trends in rainfall over Sri Lanka in support of such attribution. In our study, statistical analysis such as linear and standard deviation for 3 year, 5 year, 11 year and 21 year periods were utilized to examine periodic rainfall changes in both annual and seasonal contexts. The study finds that the 3, 5 year moving average shows high drier seasons, but the 11, 21 years moving average show higher wet seasons during the period of study. The changes of rainfall are known to have led to disasters such as flood and drought. Annual rainfall varies from 864 mm to 3081 mm, the distribution of which has sight variation throughout the district.
4
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An assessment of water quality temporal variation in Sri Jayawardenapura Kotte canal, Sri Lanka

51%
Nishanthi K., Dushanan R., Mathanraj S., Priyadharshini C.
World News of Natural Sciences
|
2021
|
vol. 38
139-157
EN
Assessment of temporal variation of the water quality is an essential aspect of evaluating temporary changes in a water body caused by natural or artificial contributions. The study aims to assess the water quality temporal variation and the water quality index over the year from 2010 to 2019. Water sampling was carried out near the bridge of the Kotte canal. Water quality parameters such as pH, electrical conductivity (EC), temperature, dissolved oxygen (DO), ammonia, nitrate, phosphate, and chemical oxygen demand (COD) were determined to assess the quality of water at different periods. It has been calculated based on the standard of the central environmental authority of Sri Lanka. The weighted arithmetic index method has been used to calculate the water quality index. The water quality index of the study area was recorded as good (33.60760) in 2010 and poor in 2013 (56.95663), 2016 (52.37269), and 2019 (69.04417). The study revealed that the water temperature in the canal fluctuates with the time and climate of the area. The EC of the water is registered within the reference range. However, pH, COD, DO, and ammonia are the main water parameters deviating from the reference range. It is observed that the leading causes of the deterioration of water quality are human activities, the illegal discharge of sewage and industrial wastewater, the lack of adequate sanitation facilities, and urban runoff.
5
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The management actions for the effects of natural disasters: a study based on Maruthamunai area

51%
Nasliha M. I. F., Rinos M. H. M., Mathanraj S.
World News of Natural Sciences
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2017
|
vol. 15
20-36
EN
Natural disasters are extreme events that result in death or injury to humans, and damage or loss of valuable infrastructure and environment. Such horrible catastrophes affect the village of Maruthamunai in Ampara District. It is situated in the tropical zone. Maruthamunai routinely experiences floods, drought, tsunami and contiguous diseases. The study was undertaken to identify the effects, causes and the disaster management activities. We also prepared a disaster risk map for the Maruthamunai area to identify the affected zone. Several methods are used to analyze this study. These include qualitative and quantitative data that were analyzed using SPSS and Arc GIS application to produce the maps. The study clarified the effects of natural disasters and prepared disaster risk maps to identify safe places. Our work will help to minimize the effects of disaster and will also support better environmental practices to mitigate the problems.
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