Coastal infrastructure, such as bridges and storm surge barriers with weirs, provides an attractive location for harvesting renewable energy using tidal turbines. Often stone layers are applied downstream of coastal infrastructure to protect the sea bed from erosion. However, little is known about the potential effect of tidal energy extraction on the stability of this granular bed protection. This paper describes a study of the flow conditions influencing the stability of the bed protection downstream of a weir-mounted tidal turbine, using hydrodynamic data of an experimental test. The analysis indicates that the flow recirculation zone downstream of a weir may become shorter and flatter due to the presence of a horizontal-axis turbine. As a result, energetic turbulence eddies can transport more horizontal momentum towards the bed – hence the reason a heavier bed protection may be required for granular beds downstream of weirs when a turbine is installed. This information is essential when designing safe bed protections for coastal infrastructure with tidal turbines.
Original languageEnglish
Title of host publicationProceedings of the Thirteenth European Wave and Tidal Energy Conference
EditorsD. Vicinanza
Place of PublicationUniversitá degli Studi della Campania ``Luigi Vanvitelli'', Italy
Pages1499-1 - 1499-4
Number of pages4
Publication statusPublished - 2019
EventEWTEC 2019: 13th European Wave and Tidal Energy Conference - Naples, Italy
Duration: 1 Sep 20196 Sep 2019

Publication series

NameProceedings of the European Wave and Tidal Energy Conference.
ISSN (Print)2309-1983


ConferenceEWTEC 2019: 13th European Wave and Tidal Energy Conference
Internet address

    Research areas

  • Tidal turbine, Bed Stability, Turbulence, Experiments

ID: 56659698