Effectiveness of Eco-retrofits in Reducing Wave Overtopping on Seawalls

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Title: Effectiveness of Eco-retrofits in Reducing Wave Overtopping on Seawalls
Authors: O'Sullivan, J. J.Salauddin, MdAbolfathi, SoroushPearson, Jonathan M.
Permanent link: http://hdl.handle.net/10197/12533
Date: 28-Dec-2020
Online since: 2021-10-06T09:58:21Z
Abstract: Terms such as 'nature-based', 'living shoreline', 'green infrastructure' and 'ecological engineering' are increasingly being used to reflect biomimicry-based engineering measures in coastal defences. Innovative interventions for nature-based sea defences have included the retrofitting of man-made water filled depressions or 'vertipools' to existing seawalls (Hall et al., 2019; Naylor et al., 2017) and the addition of artificial drill-cored rock pools to intertidal breakwaters (Evans et al., 2016). Through their capacity to retain water, such measures serve to enhance biodiversity in the built environment (Browne and Chapman, 2014). Evans et al. (2016) for example, experimentally demonstrated that the introduction of artificial rock pools to an intertidal granite breakwater enhanced the levels of species richness compared to those observed on plain surfaces of the breakwater. Notwithstanding these biological benefits, the impetus for incorporation of ecologically friendly measures to existing defences remains low (Salauddin et al., 2020a). This situation could potentially change should it be shown that the addition of 'green' measures to sea defences could enhance wave attenuation and reduce wave overtopping as well as wave pressures on the coastal defence structures. This paper describes small-scale physical modelling investigations of seawalls and explores reductions in wave overtopping that could be realised by retrofitting sea defences with 'green' features (such as 'vertipools'). Surface protrusions of varying scale and density are used in the physical modelling to mimic 'green' features and the results from measurements of overtopping are benchmarked to reference conditions determined from tests on a plain seawall.
Funding Details: European Commission - European Regional Development Fund
Type of material: Journal Article
Publisher: Coastal Engineering Research Council
Journal: Coastal Engineering Proceedings
Issue: 36v
Keywords: Eco-retrofitsOvertoppingVertical seawallClimate resilienceEcological engineering
DOI: 10.9753/icce.v36v.structures.13
Language: en
Status of Item: Peer reviewed
ISBN: 978-0-9896611-5-7
ISSN: 0589-087X
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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