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Keywords = sea defence breaching

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18 pages, 3444 KiB  
Article
Role of Beach Morphology in Wave Overtopping Hazard Assessment
by Benjamin T. Phillips, Jennifer M. Brown, Jean-Raymond Bidlot and Andrew J. Plater
J. Mar. Sci. Eng. 2017, 5(1), 1; https://doi.org/10.3390/jmse5010001 - 5 Jan 2017
Cited by 23 | Viewed by 9689
Abstract
Understanding the role of beach morphology in controlling wave overtopping volume will further minimise uncertainties in flood risk assessments at coastal locations defended by engineered structures worldwide. XBeach is used to model wave overtopping volume for a 1:200 year joint probability distribution of [...] Read more.
Understanding the role of beach morphology in controlling wave overtopping volume will further minimise uncertainties in flood risk assessments at coastal locations defended by engineered structures worldwide. XBeach is used to model wave overtopping volume for a 1:200 year joint probability distribution of waves and water levels with measured, pre- and post-storm beach profiles. The simulation with measured bathymetry is repeated with and without morphological evolution enabled during the modelled storm event. This research assesses the role of morphology in controlling wave overtopping volumes for hazardous events that meet the typical design level of coastal defence structures. Results show that disabling storm-driven morphology under-represents modelled wave overtopping volumes by up to 39% under high H s conditions and has a greater impact on the wave overtopping rate than the variability applied within the boundary conditions due to the range of wave-water level combinations that meet the 1:200 year joint probability criterion. Accounting for morphology in flood modelling is therefore critical for accurately predicting wave overtopping volumes and the resulting flood hazard and to assess economic losses. Full article
(This article belongs to the Special Issue Modelling Waves in Coasts and Estuaries)
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30 pages, 1721 KiB  
Article
Coastal Flooding in the Solent: An Integrated Analysis of Defences and Inundation
by Matthew P. Wadey, Robert J. Nicholls and Craig Hutton
Water 2012, 4(2), 430-459; https://doi.org/10.3390/w4020430 - 26 Apr 2012
Cited by 48 | Viewed by 13601
Abstract
This paper demonstrates a methodology for integrating existing models for the rapid simulation of coastal flood events across a large and varied case study area on the UK south coast. Following validation against observations from real coastal floods, synthetic events driven by realistic [...] Read more.
This paper demonstrates a methodology for integrating existing models for the rapid simulation of coastal flood events across a large and varied case study area on the UK south coast. Following validation against observations from real coastal floods, synthetic events driven by realistic waves and water levels and the full range of failure mechanisms were modelled for a range of loadings to generate peak flood water depths and an overview of impacts across this spectrum of possible floods. Overtopping is relatively important compared to breaching as coastal floodplains are small. This modelling system supports multiple potential applications, such as planning flood warnings, coastal defence upgrade, and land use, including under sea-level rise. The concepts drawn from this study are transferable to similar coastal regions. Full article
(This article belongs to the Special Issue Flood Risk Management)
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