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Ocean Science An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/os-2019-122
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-122
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 11 Dec 2019

Submitted as: research article | 11 Dec 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

A monthly tidal envelope classification approach for semi-diurnal regimes with variability in S2 and N2 tidal amplitude ratios

Do-Seong Byun1 and Deirdre E. Hart2 Do-Seong Byun and Deirdre E. Hart
  • 1Ocean Research Division, Korea Hydrographic and Oceanographic Agency, Busan 49111, Republic of Korea
  • 2School of Earth and Environment, University of Canterbury, Christchurch 8140, Aotearoa New Zealand

Abstract. In a world of increasing coastal inundation hazards, an understanding of daily through to monthly tidal envelope characteristics is fundamental to resilient coastal management and development practices. For decades, scientists have described and compared daily tidal forms around the world’s coasts based on the four main tidal amplitudes. Our paper builds on this daily method by adjusting the constituent analysis to distinguish the different monthly types of tidal envelope occurring in the semi-diurnal coastal waters around Aotearoa New Zealand. Analyses of tidal records from 23 stations are used, alongside data from the FES2014 tide model database and theoretical experiments, in order to find the key characteristics and constituent ratios of tides that can be used to classify monthly tidal envelopes. The resulting monthly tidal envelope classification approach described (FMS) is simple, complementary to the successful and much used daily tidal form factor (F), and of use for coastal flooding, climate change and maritime operation management and planning applications in semi-diurnal regimes.

Do-Seong Byun and Deirdre E. Hart
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Do-Seong Byun and Deirdre E. Hart
Do-Seong Byun and Deirdre E. Hart
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Short summary
Common ways of describing the rise and fall of the tides are essential for safe and productive coastal habitation. We have long had a useful formula to describe the rise and fall of tides at daily timescales but no purposive method for characterizing tidal height variations at longer timescales. This paper uses observations from New Zealand, plus model and theory data, to explain different tide envelop types at monthly timescales, complementing the existing way of describing daily tidal forms.
Common ways of describing the rise and fall of the tides are essential for safe and productive...
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