Using a two-step framework for the investigation of storm impacted beach/dune erosion

Dissanayake, Pushpa; Brown, Jennifer ORCID: https://orcid.org/0000-0002-3894-4651; Sibbertsen, Philipp; Winter, Christian. 2021 Using a two-step framework for the investigation of storm impacted beach/dune erosion. Coastal Engineering, 168, 103939. https://doi.org/10.1016/j.coastaleng.2021.103939

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Abstract/Summary

Long-term coastal management of beach/dune systems requires the definition and assessment of storm events. This study presents a framework using statistical analyses and numerical modelling (XBeach) to characterize storm events and investigate their impact on beach/dune erosion. The method is developed using exemplary data from Formby Point on the Sefton coast (UK), which has a complex beach morphology and frontal dunes. Relevant storm events are classified by a versatile univariate response function taking into account both nearshore water levels and offshore significant wave heights (Hs). It is shown that compared to the established storm classification (Hs ≥ 2.5 m) 35% more storm events that are relevant for beach/dune erosion are identified. Also the events exceed critical conditions for longer durations, and cause greater erosion impact (12%) along the beach/dune profile. The proposed classification of storm events thus captures relevant events for the storm erosion and can inform coastal management strategies. This framework is widely applicable to other beach/dune systems.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.coastaleng.2021.103939
ISSN:	03783839
Date made live:	08 Jul 2021 10:17 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530579

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