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Modelling Extreme Wave Overtopping at Aberystwyth Promenade

Daniel A. Thompson, Harshinie Karunarathna Orcid Logo, Dominic Reeve Orcid Logo

Water, Volume: 9, Issue: 9, Start page: 663

Swansea University Authors: Harshinie Karunarathna Orcid Logo, Dominic Reeve Orcid Logo

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DOI (Published version): 10.3390/w9090663

Abstract

The work presents a methodology to assess the coastal impacts during a storm event which caused significant damage along the promenade at Aberystwyth, Wales on the 3 January 2014. Overtopping was analysed in detail for a section of promenade by downscaling offshore wave conditions to force a surf zo...

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Published in: Water
ISSN: 2073-4441
Published: MDPI AG 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa35015
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Abstract: The work presents a methodology to assess the coastal impacts during a storm event which caused significant damage along the promenade at Aberystwyth, Wales on the 3 January 2014. Overtopping was analysed in detail for a section of promenade by downscaling offshore wave conditions to force a surf zone hydrodynamic model, NEWRANS. Overtopping discharges are computed and were in qualitative agreement with published discharges for the level of damage observed along the promenade. Peak storm conditions were observed to arrive just before and during high tide at Aberystwyth, which in addition to a storm surge and wave-setup, contributed to the damage observed. A high frequency of overtopping occurs during peak high tide, with overtopping also occurring in the hour leading up to and following high tide. Finally, comparisons to design methods for the estimation of overtopping discharge were made. Current empirical formulae underestimated the peak overtopping event at high tide. The methodology applied is generic and applicable to any location.
Keywords: wave overtopping; coastal flooding; modelling; extreme events
College: College of Engineering
Issue: 9
Start Page: 663