| dc.description.abstract | The seasonal fluctuations cause water
level variations in coastal regions. This research
aims to investigate the seasonal variability of tidal
constituents and Mean Sea Level (MSL). Seven
years tidal data from the Colombo Port was used to
investigate the seasonal variability of both Mean
Sea Level (MSL) and tidal constituents. The
processing of tidal data was performed using a
harmonic analysis based tidal processing and
analysis software TOTIS. The findings indicate that
the MSL at Colombo exhibit a pattern with seasonal
variations. MSL is high during the Southwest
monsoon season than the Northeast monsoon season
in generally. Then, the variability of amplitude and
phase of diurnal (K1, M1, S1, O1), semi-diurnal
(K2, M2, S2, T2), and long period (MF, MM, MSF,
and SSA) tidal constituents were investigated for
Colombo Port. The amplitude of all diurnal
constituents exhibited a pattern with seasonal
variations, with higher values during the Northeast
monsoon season than the Southwest monsoon
season. The amplitudes of all semidiurnal
constituents exhibited a pattern opposite to that of
the diurnal constituents in generally. However, it
exhibited a complete opposite pattern during the
years 2025 & 2020 where the MSL variation also
altered. The long constituents were also exhibited a
pattern with seasonal variations. The study found
that the phase of each tidal constituent exhibited the
same pattern in all years, although K1,M1,M2 and
S2 changed the patterns during the same years in
which the pattern of MSL was changed.
Furthermore, unlike the amplitude variability
patterns, the phase component patterns within the
same category were not similar to each other.
Finally, the study concluded that amplitudes and
phases of tidal constituents exhibit a significance
alterations with seasonal variations. | en_US |
