Abstract:
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.
Citation:
Jayasooriya, S.P.N.D., Fernando, S.F.R.S., Priyantha, H.N.L., Vijitha, A.V.P., Premasiri, H.M.R., & Samaradivakara, G.V.I. (2021). Characterisation of sediment deposition of Bolgoda lake using acoustic and sampling methods. In D.M.D.O.K. Dissanayake & C.L. Jayawardena (Eds.), Proceedings of International Symposium on Earth Resources Management & Environment 2021 (pp. 143-149). Department of Earth Resources Engineering, University of Moratuwa. https://uom.lk/sites/default/files/ere/files/ISERME%202021%20Proceedings_2.pdf