Browsing by Author "Rathnaweera, TD"

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    Effects of climate change on landslide frequencies in landslide prone districts in Sri Lanka; Overview
    (2013-11-12) Rathnaweera, TD; Palihawadana, MP; Rangana, HLL; Nawagamuwa, UP
    Recently antecedent rainfalls and short term high intense rainfalls have become a general weather condition in Sri Lanka. Most of the recently occurred landslides could have some possible relationship with this unusual weather condition. Unpredictable variability of climate could probably be due to climate change where many environmental changes are happening around the world due to the climate change or global warming. This paper discusses the effect of climate change on landslide frequency in landslide prone districts in Sri Lanka. Several factors, such as rainfall and temperature variation in the last decade are analyzed to assess their significance. Analysis confirms that these changes have a possible effect on landslide frequency in Sri Lanka. Based on these results, possible trend patterns due to climate change during last decade are identified.
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    Effects of global warming on landslide frequencies in Ratnapura District, Sri Lanka - 2011
    (Department of Civil Engineering, University of Moratuwa, 2011-12) Rathnaweera, TD; Nawagamuwa, UP; Ratnayake, N
    Unpredictable variability of rainfall patterns could probably be due to global climate changes with the increased frequency of extream whether events. Infact, rainfall is the most relevant factor for the triggering of both shallow and deep - seated landslides in Sri Lanka. Landslides related to heavy rainfall cause widespread property damage and occasional loss of lives. in recent years, number of rain-induced landslides have been increased in the Ratnapura district due to heavy rainfall. One of the most critical concerns in landslide study at the moment is the potential link between climate change and the frequancis of mass movement occurrences. In this research and overall study of the climate change on landslide frequencies in Ratnapura, distric is done by analysis the trend of the rainfall and temperature variation patterns.
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    item: Article-Abstract
    Study of the impact of rainfall trends on landslide frequencies : Sri Lanka overview
    Rathnaweera, TD; Nawagamuwa, UP
    Landslides related to heavy rainfall cause widespread property damage and occasional loss of lives. During the last ten years it has become evident that the most devastating landslide events tend to occur as a result of comparatively short duration, high intense rainfall compared to the previously had lower intense prolonged rainfalls. At a time when climate change and global warming issues are considered as hot topics, it is required to evaluate the changes and their impacts on landslides frequencies in Sri Lanka. This study looks at extreme rain conditions in the context of climate change in landslide prone districts in Sri Lanka. Mainly two trend patterns, seasonal distribution of landslides and Annual total time series distribution of landslides were developed to get the effect of climate changes in se.lected landslide prone districts in Sri Lanka. Identification of extreme rainfall conditions were done based on data collected from the Department of Meteorology, Sri Lanka. The possible trends are discussed using above rainfall variations and the coUected landslide frequency data.
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    item: Article-Abstract
    Study of the Impact of Rainfall Trends on Landslide Frequencies; Sri Lanka Overview
    (2014-08-07) Rathnaweera, TD; Nawagamuwa, UP
    Landslides related to heavy rainfall cause widespread property damage and occasional loss of lives. During the last ten years it has become evident that the most devastating landslide events tend to occur as a result of comparatively short duration, high intense rainfall compared to the previously had lower intense prolonged rainfalls. At a time when climate change and global warming issues are considered as hot topics, it is required to evaluate the changes and their impacts on landslides frequencies in Sri Lanka. This study looks at extreme rain conditions in the context of climate change in landslide prone districts in Sri Lanka. Mainly two trend patterns, seasonal distribution of landslides and Annual total time series distribution of landslides were developed to get the effect of climate changes in selected landslide prone districts in Sri Lanka. Identification of extreme rainfall conditions were done based on data collected from the Department ofMeteorology, Sri Lanka. The possible trends are discussed using above rainfall variations and the collected landslide frequency data