ISERME - 2021

Permanent URI for this collectionhttp://192.248.9.226/handle/123/16970

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Browsing ISERME - 2021 by Subject "Bathymetry"

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    Characterisation of sediment deposition of Bolgoda lake using acoustic and sampling methods
    (Department of Earth Resources Engineering, University of Moratuwa, 2021-12) Jayasooriya, SPND; Fernando, SFRS; Priyantha, HNL; Vijitha, AVP; Premasiri, HMR; Samaradivakara, GVI; Dissanayake, DMDOK; Jayawardena, CL
    Bolgoda Lake is one of the main water resources in the western province, which has two major basins explained as Bolgoda south and north lakes. Lake sedimentation is a serious dilemma for water scarcity, productivity, and flooding effect. So, identification of sediment characteristics is most critical. The attempt of this study is to identify the sedimentation pattern, sediment type, and mineral composition of the sediment from the data collected from core sampling, grab sampling, and the bathymetric data obtained from spot depth eco sounder that combines with Magellan 510. Hence, grain size distribution (GSD), scanning electron microscope (SEM), and bathymetric surveys were utilised to recognise sediment type, heavy metal composition, and sedimentation pattern, respectively. These analyses revealed that bottom sediment has poorly sorted, very fine skewed, physical characteristics have statistical distribution and discover the sediment type as sandy silt. Also, bathymetric analysis upholds the sedimentation pattern that accumulates sediment from the left bank to the right bank of the Bolgoda lake via the water column and to identify the sediment distribution along the lake bottom.
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    Investigation of Bolgoda lake to establish a ferry service for University of Moratuwa
    (Department of Earth Resources Engineering, University of Moratuwa, 2021-12) Padmasiri, IHHI; Weerasinghe, GAJB; Dasanayaka, DMH; Samaradivakara, GVI; Vijitha, AVP; Dissanayake, DMDOK; Jayawardena, CL
    Colombo is one of the major cities which has a high population density with a smaller number of transportation facilities over many years. Even though it has a good canal system, waterway transportation is not implemented for no reason. With the idea of establishing a ferry service from the University of Moratuwa to Panadura along the Bolgoda lake, our research was carried out to determine the main parameters relevant to the aim of the project. Prioritise factors considered are Bolgoda lake bathymetry, identification of restricted areas, highly sensitive areas, material type to be dredged, and possible locations for terminals. Initially, the research area was narrowed down from the boatyard of the University of Moratuwa to the Vijayarama temple. There are several ways to determine the bathymetry of a water body, and echo-sounding techniques were used in our research. Bathymetry of the region was determined with cut volume to be dredged to make the ferry path safe using "Hondex PS 7" echo sounder and Surfer software. "ArcGIS" software was utilised to generate maps, and "Slope W" software was used in analysing dredge slope and its stability. The research was carried out during the dry season, and the water level was indicated as 4.2 m on the gauge at the bridge.