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Papers by Herath Jayaweera
International Journal of Scientific and Engineering Research, 2015
The measurement of wind speed and direction are the most important factors in weather prediction.... more The measurement of wind speed and direction are the most important factors in weather prediction. They can be measured by a variety of tools. The most common, complete portable system is the anemometer, which typically consists of a rotating vane to measure the direction and a shaft with cups that rotate with the wind to measure its speed. There are various models presented for the dynamic of the three cup anemometer and the area dynamic drag coefficient model has been employed in this project. The area dynamic drag coefficient model has been developed to calculate the ratio of the regressive and progressive area dynamic-drag coefficient of the anemometer cups using the half covered anemometer model. So the anemometer factor can be obtained experimentally without using any other standard anemometers and it can be easily calibrated. The half covered cup system was found to be more sensitive than the open cup system and also it was found that the length of the cup arm should be twice ...
A term papert on Flood Risk Management in Ghana: A Case Study in Accra
International Journal of Scientific and Engineering Research, 2015
In this paper, a situational analysis of flood and drought in Rwanda were assessed using AQUEDUCT... more In this paper, a situational analysis of flood and drought in Rwanda were assessed using AQUEDUCT Global Flood Analyzer based on the population, Gross Domestic Product (GDP) and urban damage for current and future projections (2030). In order to estimate future changes, three scenarios from: Representative Concentration Pathways (RCP) and Shared Socio-economic Pathways (SSP) from the Intergovernmental Panel on Climate Change 5th Assessment Report which represents climate change and socioeconomic change scenarios respectively were employed. Data from 1981-2010 were used to determine the average monthly precipitation for current years and IPCC scenario A2 was employed to generate datasets that predict the average monthly precipitation from 2011-2100 using Meteonorm 7 software. A 10-year flood protection level was employed to ascertain the rate of urban damage, its effects on Gross Domestic Product (GDP) and the Population at risk. The study revealed that, Rwanda has more than 20% probability of inland flooding in any given year; a 10-year flood has a 10% probability of occurring in any given year and could cause roughly 6.1millionurbandamage;6.1 million urban damage; 6.1millionurbandamage;865.6 million affected GDP and 837.2 thousand affected population, if there is no flood protection. Flood and drought events cannot be totally eradicated but with mitigation approach and preparedness before its occurrence: social and economic losses can be minimized.
International Journal of Scientific and Engineering Research, 2015
The measurement of wind speed and direction are the most important factors in weather prediction.... more The measurement of wind speed and direction are the most important factors in weather prediction. They can be measured by a variety of tools. The most common, complete portable system is the anemometer, which typically consists of a rotating vane to measure the direction and a shaft with cups that rotate with the wind to measure its speed. There are various models presented for the dynamic of the three cup anemometer and the area dynamic drag coefficient model has been employed in this project. The area dynamic drag coefficient model has been developed to calculate the ratio of the regressive and progressive area dynamic-drag coefficient of the anemometer cups using the half covered anemometer model. So the anemometer factor can be obtained experimentally without using any other standard anemometers and it can be easily calibrated. The half covered cup system was found to be more sensitive than the open cup system and also it was found that the length of the cup arm should be twice ...
A term papert on Flood Risk Management in Ghana: A Case Study in Accra
International Journal of Scientific and Engineering Research, 2015
In this paper, a situational analysis of flood and drought in Rwanda were assessed using AQUEDUCT... more In this paper, a situational analysis of flood and drought in Rwanda were assessed using AQUEDUCT Global Flood Analyzer based on the population, Gross Domestic Product (GDP) and urban damage for current and future projections (2030). In order to estimate future changes, three scenarios from: Representative Concentration Pathways (RCP) and Shared Socio-economic Pathways (SSP) from the Intergovernmental Panel on Climate Change 5th Assessment Report which represents climate change and socioeconomic change scenarios respectively were employed. Data from 1981-2010 were used to determine the average monthly precipitation for current years and IPCC scenario A2 was employed to generate datasets that predict the average monthly precipitation from 2011-2100 using Meteonorm 7 software. A 10-year flood protection level was employed to ascertain the rate of urban damage, its effects on Gross Domestic Product (GDP) and the Population at risk. The study revealed that, Rwanda has more than 20% probability of inland flooding in any given year; a 10-year flood has a 10% probability of occurring in any given year and could cause roughly 6.1millionurbandamage;6.1 million urban damage; 6.1millionurbandamage;865.6 million affected GDP and 837.2 thousand affected population, if there is no flood protection. Flood and drought events cannot be totally eradicated but with mitigation approach and preparedness before its occurrence: social and economic losses can be minimized.