Tidal Trend Evaluation for Imo River between 2013 and 2021

International Journal of Geoinformatics and Geological Science
© 2022 by SSRG - IJGGS Journal
Volume 9 Issue 1
Year of Publication : 2022
Authors : Akwaowo Udo Ekpa , Itoro Ben Udoh
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Akwaowo Udo Ekpa , Itoro Ben Udoh, "Tidal Trend Evaluation for Imo River between 2013 and 2021," SSRG International Journal of Geoinformatics and Geological Science, vol. 9,  no. 1, pp. 38-45, 2022. Crossref, https://doi.org/10.14445/23939206/IJGGS-V9I1P105

Abstract:

Reliable tidal prediction and estimation of water levels require accurate tidal prediction constants. To ascertain if the tide in Imo River was evolving, the investigation was carried out on the trend of tidal constituents and associated tidal constants. Trends for tidal harmonic constants, tidal datum, and tide ranges were analyzed based on sets of 35 tidal constituents derived in 2013 and 2021. Study results revealed an increase in amplitudes of diurnal constituents and a decrease for semi-diurnalsemi-diurnal components except for M2, the principal lunar semi-diurnalsemi-diurnal constituent. The trend of amplitude for the principal tidal constituents was within ±4cm. At the same time, the phase angles varied between -13.17° and 8.29° but for M2, which remained relatively stable. Tidal datum and tidal ranges for spring and neap tides had a mixed trend. Mean sea level between 2013 and 2021varied by 0.007m inferring that the relative sea-level increased by 0.88mm per year while the tidal range decreased by 53mm. Although the trend was relatively low, the study revealed that the tide in the Imo River is evolving over geological time scales due to relative sea-level rise. Care should be taken to account for the variability when predictions and investigations on tidal dynamics of the river are carried out.

Keywords:

Amplitude, Harmonic Constants, Phase Angles, Sea Level Rise, Tidal Constituents, Tidal Trend.

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