| 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, sealevel
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 echosounder
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 |
