Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2017-64
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
22 Mar 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
The role of tidal modulation in coastal flooding on a micro-tidal coast during Central American Cold Surge events
Wilmer Rey1, Paulo Salles2,3, E. Tonatiuh Mendoza2,3, Alec Torres-Freyermuth2,3, and Christian M. Appendini2,3 1Programa de Maestría y Doctorado en Ingeniería, Universidad Nacional Autónoma de México, DF 04510, Mexico
2Laboratorio de Ingeniería y Procesos Costeros, Instituto de Ingeniería, UNAM, México. Puerto de abrigo s/n, 92718 Sisal, México
3Laboratorio Nacional de Resiliencia Costera (LANRESC), CONACyT, Yucatán, Mexico
Abstract. Coastal flooding in the Yucatan Peninsula is mainly associated with storm surge events triggered by high-pressure cold fronts systems passing through the Gulf of Mexico. To assess coastal flood hazards, this study uses a thirty-year water level hindcast, and considers the contribution of wave setup and the role of tidal hydrodynamics. To diagnose the mechanisms controlling the water levels, extreme sea level occurrence probability at Progreso Port was performed to identify the two worst storms in terms of maximum residual tide (Event A), and maximum water level (Event B). Numerical results suggest that during Event A the wave setup contribution reaches 0.35 m at the coast and 0.17 m inside the back-barrier lagoon, while these values are smaller for Event B (0.30 m and 0.14 m, respectively). Besides, numerical results of the effect of the astronomical tidal phase on the wave set-up and the residual sea level show that: (i) the wave set-up is tidally modulated and contributes up to 14 % to the extreme water levels at the inlet, (ii) the residual tide is larger (smaller) during near-low (high) or receding (rising) tide, and (iii) maximum flooding occurs when the storm peak coincides with rising or high tide, despite micro-tidal conditions.

Citation: Rey, W., Salles, P., Mendoza, E. T., Torres-Freyermuth, A., and Appendini, C. M.: The role of tidal modulation in coastal flooding on a micro-tidal coast during Central American Cold Surge events, Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2017-64, in review, 2017.
Wilmer Rey et al.
Wilmer Rey et al.
Wilmer Rey et al.

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Short summary
Storms are common in tropical coasts and can produce dangerous flooding. To assess coastal flood hazards and the mechanisms controlling water levels, this study uses numerical modelling, applied to the northwest Yucatán Peninsula. Results suggest that (a) wave setup is tidally modulated and can be an important process (up to 14 % of the extreme water levels), and (b) the tidal phase (low, high, rising, receding) and its occurrence probability has to be taken into account for risk assesment.
Storms are common in tropical coasts and can produce dangerous flooding. To assess coastal flood...
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