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Effectiveness of eco-retrofits in reducing wave overtopping on seawalls

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O'Sullivan, John, Salauddin, Md, Abolfathi, Soroush and Pearson, Jonathan M. (2020) Effectiveness of eco-retrofits in reducing wave overtopping on seawalls. Coastal Engineering Proceedings (36v). doi:10.9753/icce.v36v.structures.13

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Official URL: https://doi.org/10.9753/icce.v36v.structures.13

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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.

Item Type: Journal Article
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TS Manufactures
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Sustainable design, Resilience (Ecology), Ecological engineering, Hydrodynamics, Coast defenses, Surface roughness, Sea-walls, Coastal zone management
Journal or Publication Title: Coastal Engineering Proceedings
Publisher: Coastal Engineering Research Council
ISSN: 2156-1028
Official Date: 28 December 2020
Dates:
DateEvent
28 December 2020Published
28 December 2020Accepted
Number: 36v
DOI: 10.9753/icce.v36v.structures.13
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
Ecostructure Project : Ireland-Wales Cooperation Programme[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530

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