Multi-functional
artificial reefs offer an opportunity for coastal defence structures to deliver
ecological and/or amenity benefits, and in doing so, support drivers for sustainable
development. CIRIA has developed a scoping study that focuses on artificial
reef structures used for coastal defence (ie detached nearshore breakwaters)
and identifies the opportunities and constraints to adding marine habitat
(eg biodiversity, fisheries) and/or amenity (eg sea angling, diving, surfing).
Some similarities are apparent between artificial reefs used for coastal defence and artificial reefs used for habitat and amenity, suggesting that multi-functional artificial reefs need not be substantially more difficult to achieve than a traditional detached breakwater. However, by examining existing information and using case studies, this scoping study has identified various knowledge gaps that could be addressed by dedicated guidance about design and materials requirements, economic evaluation and funding, planning and policy drivers, and health and safety issues.