Enhancing climate resilience of vertical seawall with retrofitting - A physical modelling study

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Title: Enhancing climate resilience of vertical seawall with retrofitting - A physical modelling study
Authors: Dong, ShudiAbolfathi, SoroushSalauddin, MdTan, Z. H.Pearson, Jonathan M.
Permanent link: http://hdl.handle.net/10197/12530
Date: Oct-2020
Online since: 2021-10-06T09:10:45Z
Abstract: Coastal defence structures are playing a vital role in protecting coastal communities from extreme climatic conditions and flooding. With climate change and sea-level rise in the next decades, the freeboard of existing coastal defences is likely to be reduced and the probability of wave overtopping for these coastal defences will increase. The wave overtopping from coastal defences increases the probability of coastal inundation and flooding, imposing threat to the communities which are living in low-lying coastal areas. Retrofitting of existing seawalls offers the potential to enhance coastal resilience by allowing them to adapt and respond to changing climatic conditions. This study investigates a range of possible physical configurations and optimum retrofit geometry to maximize the protection of existing seawalls from wave overtopping. A comprehensive physical modelling study of four retrofit prototypes, including recurve wall, model vegetation, reef breakwater and diffraction pillars, was conducted to examine their performance in mitigating wave overtopping, when placed in front of a vertical seawall. All the tests were conducted on 1:20 smooth beach slope. Each test case consisted of approximately 1000 pseudo-random waves based on the JONSWAP spectrum. The physical modelling experiments were designed to include both impulsive and non-impulsive wave conditions. This study provides new predictive relations and decision support tool needed to evaluate overtopping risks from existing seawalls with retrofits under various hydrodynamic conditions. The analysis of experimental measurements demonstrates that wave overtopping from retrofitting structures can be predicted with similar relations for vertical seawalls, and by using a reduction factor which varies with geometric shapes. Statistical measures and sensitivity analysis show that recurve walls have the best performance in reduction of wave overtopping volume followed by model vegetation and reef breakwater. The measurements show the insignificance of diffraction pillars, at least for the selected configurations investigated, in mitigating wave overtopping.
Funding Details: Royal Academy of Engineering –Leverhulme Trust
China Scholarship Council
Sultan Haji Hassanal Bolkiah Foundation
Type of material: Journal Article
Publisher: Elsevier
Journal: Applied Ocean Research
Volume: 103
Copyright (published version): 2020 Elsevier
Keywords: Overtopping dischargeWave-by-wave overtopping volumeCoastal resilienceRetrofitting seawallsRecurve wallClimate change adaptionCoastal flooding
DOI: 10.1016/j.apor.2020.102331
Language: en
Status of Item: Peer reviewed
ISSN: 0141-1187
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Centre for Water Resources Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection

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