https://ir.kdu.ac.lk/handle/345/3870 Wed, 08 Apr 2026 14:55:43 GMT 2026-04-08T14:55:43Z https://ir.kdu.ac.lk/handle/345/2343 Development of an Algorithm to Identify the Locations of Flood Victims Using Digital Image Processing Karalliyadda, JMI; Dinusha, KA; Meththananda, RGUI Floods are regular disasters that cause for the greatest economic losses in the world. Due to that, victims from flood disaster monitoring and the damage estimates are important to the population, government authorities also the insurance companies. Global demand for unman aerial vehicles has increased significantly by the emerging economics and it is capable enough to act it a vast area of tasks which are considered dirty, dull, or dangerous by the humans. UAVs provide a platform to minimize human involvement and speediness the process of identifying and locating the causalities, the mission of analyzing of gathered images can be given to a computerized algorithm which examines the images. Acomputerized algorithm which can determine and geologically identify the locations where flood victims can be originate is required to identify the victims in a shorter time to direct rescue teams towards them, it will reduce the death toll due to flood disaster. This document describes the unique solution built on hybrid networks and image processing by using the aerial photographs. As a first innovation, capturing the flood situation, converting and overlapping image processing is used. Color and spatial information extracted from simultaneous color matching and fractal quality dimension matrixes are also used. The experimental results of the real task finally show the effectiveness of the method and the performance of the algorithm. Tue, 01 Jan 2019 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2343 2019-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2342 Change Detection in Land Surface Temperature Using Remote Sensing and GIS Techniques: A Case Study of Biyagama De Silva, MKC; Rupasinghe, AR; Dinusha, KA Several studies carried out by different scholars have proved that the world climate got hotter during the last years. Most of the temperature increases since mid- 20th century has been caused by increases in atmospheric greenhouse gas concentrations produced by industrialization. Other than that, urbanization caused to increase the area temperature because its transform the natural land surface with modern land use and land cover such as buildings, roads and other impervious surface. When considering about Sri Lanka, now a days Biyagama area is identified as a rapidly developing area and due to this reason most probably the temperature may be changed. But in Biyagama area, there is no meteorological observatory and data could be got from the Colombo meteorological observatory which is located near the Southeast boundary of the city. Due to failure of a proper mechanism to identify the temperature variation in this area, there may be makes some restrictions to analyse the spatial pattern of temperature and the temperature levels in the Biyagama area. The purpose of this study is to evaluate the use of Thermal Infrared Remote Sensing data for assessing temperature differences in Biyagama area and examine the factors influencing the elevation of temperature in the Biyagama area. Thermal remote sensing has been used to measure the Land Surface Temperature and its capability in monitoring temperature and effecting microclimate in urban areas. In this study, bands of Landsat-7 ETM+ and Landsat 8 OLl & TIRS imagery obtained during 2001-2018 will be analyzed for the spatial distribution of changes in temperature in Biyagama area. The study showed the increment of Land Surface Temperature (LST) near the industrial area in comparison with suburban areas, also building is one of the factor that reflect more heat and it is responsible for raising the surface temperature. It is noticed that, Oil Refinery could be considered the main source of heat in Sapugaskanda area. Tue, 01 Jan 2019 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2342 2019-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2341 Modification for End Area Rule Used in Volume Calculation of Highway Pavements Wanasinghe, GI; De Silva, HKNA; Thennakoon, PG; Kalugamuwa, KWGIM Volume calculation of earth work of road pavements is very important section in project cost estimation. Practically it is very difficult to calculate the actual volume of a pavement as the cross section varies by its width, height, shape and formation level. The conventional calculation method is to use end area rule which calculates the area between two consecutive sections as the product of average area of sections and distance between sections assuming there is a linear variation of sectional area between two sections. The actual volume of the section deviates from the calculated volume using end area rule due to the violations of assumptions of the equation. This study was carried out to investigate on the errors of application of end area rule in volume calculations of highway pavements. The actual volume was calculated by a numerical analysis by integration and also by preparing a model using computer software. A modification factor was developed using the perpendicular distance between the centroids of cross sections and end area rule was applied with this modification factor. The validity of the results is evaluated by comparing the calculated volume with actual volumes obtained by mathematical and software models. It was concluded that a volume can be calculated up to a better accuracy using this modification factor together with the end area rule. Tue, 01 Jan 2019 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2341 2019-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2340 Review of Impacts on Coastal Zone Due to Poor Riverine Flood Controlling Mechanism: A Case Study in Kalutara Coastal Zone, Sri Lanka Gunasinghe, GP; Dinusha, KA; Ratnayake, NP; Samaradivakara, GVI; Ratnayake, AS; Premasiri, HMR; Ruhunage, L Sri Lanka has attractive coastal zone that contributes to the economic value of the country by promoting tourism-related activities. In addition, due to the existence of natural coastal features, the coastal areas of the country have become the main obstacle to the natural coastal hazards as Tsunami. However, the coastal area of Kalutara is currently facing serious problems due to the anthropogenic activities. Kalutara is also highly vulnerable area for riverine flood of Kalu Ganga. In May 2017, a considerable portion of naturally formed sand barrier at Kalu Ganga River outfall was removed as a strategy to risk reduction process of flooding. The focus of this study is to review the negative impacts of this risk reduction process. To achieve this objective, the bathymetric profiles and the Google Earth satellite images from 2013 to 2019 were collected and analysed. The review data is shown a chronological variation of the sand barrier at the river outfall. Also erosion in the Kalutara coastal region is accelerating after May 2017. Moreover, from the questionnaire survey, salt water intrusion identified as a serious problem in the region. When applying risk reduction process for any disaster, first have to identify the best possible mechanism and it should be applied in proper manner for appropriate location. If not, other hazards may generate as side effects of the poor risk reduction strategies by developing harmful effects for the society and the environment. Tue, 01 Jan 2019 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2340 2019-01-01T00:00:00Z