| dc.description.abstract | Hydrography is one of the main branches of surveying. In the modern world, the
hydrography field plays a major role in safe navigation purposes and seafloor
mapping. Bathymetry survey is the science of identifying and preparing charts
about the behaviour of the ocean’s floor. Also, bathymetric data provides an
important foundation for the process of generating profiles of the seafloor,
charts for safe navigation, coastal area erosion/accretion, sea-level variations,
and so on. Due to the waves and currents, the sediments are transporting along
the seabed and the seafloor may differ continuously. Therefore, hydrographers
should collect hydrographic data for safe navigation purposes and other
oceanographic requirements. The present study mainly focused on sediment
accumulation and decumulation patterns utilizing bathymetric surveys in the
Beruwala fishery harbour. The bathymetric data were collected by using a single
beam echo-sounder in February 2012, September 2013, August 2017, and
February 2019. Further, sand volumes were calculated by time series of
bathymetric data using ArcGIS software with several tools (IDW, etc.) and
results shows that sand accumulation is evident in February 2012 and February
2019. Further, sand decumulation is obvious in September 2013 and August
2017. Based on the obtained results, sand accumulation inside the harbour is
evident during the northeast monsoon season and sand decumulation is evident
during southwest monsoon season. So, this information is important for the
maintenance of the harbour basin. | en_US |
