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WireWall numerical wave overtopping estimates on days with photographic evidence, 2013-2017

Title

WireWall project numerical wave overtopping volume estimates at Crosby Hall Road Carpark (north of Liverpool UK) using a beach profile in 1996 and three in 2017, estimates are for coastal conditions when there is photographic evidence of overtopping occurring between 2013 - 2017.

Author(s) Brown J. (1); Pullen T. (2); Silva E. (2); Prime T. (1); Yelland M.J. (3)

(1) National Oceanography Centre, Liverpool; (2) HR Wallingford; (3) National Oceanography Centre, Southampton

Subject oceans
Abstract

Numerical wave overtopping volume estimates from the BayonetGPE wave overtopping tool associated with the EurOtop (2018) manual and modelled wave and water level conditions at the toe of the structure transformed from nearshore national monitoring networks using the SWAN model. Mean, upper and lower 1st and 2nd standard deviation wave overtopping volumes are estimated by BayonetGPE (generated by HR Wallingford, October 2019) for the Hall Road Car Park, Crosby Beach survey profile (reference: 11A02231). The data are associated with photographs of events when there is a record showing some level of overtopping occurring at Crosby beach. The photographic data were collected for the period January 2013 to December 2017 from Facebook (page: I'm at Crosby Beach and the weather is ...) and project partners. The numerical estimates of overtopping were generated using: beach surveys (available from Channel Coastal Observatory) from 24th February 2017, 4th April 2017, 4th October 2017 and 1 September 1996; a laser scan of the sea wall collected 11th December 2013 (available from Sefton Council); Seazone bathymetry from 05/12/2014, originally collected by the UK Hydrographic Office at 1 arc second; wave conditions (available from WaveNet, Centre for Environment, Fisheries and Aquaculture Science (CEFAS)); water levels tide gauge data (available from the National Tidal Sea Level Facility (NTSLF) who deliver data through the British Oceanographic Data Centre (BODC)). The coastal conditions were transformed to the toe of the existing structure using the 3rd generation spectral wave model SWAN. The bottom friction was set to use bed ripples and a sediment size of 0.23 mm (the Median grain size, d50, for the upper beach at Crosby, KPAL 2010). BayonetGPE was then used to estimate the resulting overtopping discharges.

Temporal coverage 30 January 2013 - 07 December 2017
Spatial coverage Liverpool Bay
File format Delimited
Language English
Discovery metadata record Link to the related European Directory of Marine Environmental Data (EDMED) record
Publisher British Oceanographic Data Centre, National Oceanography Centre, NERC, UK
Publication date 15 September 2020
Digital Object Identifier (DOI) doi:10.5285/acd939f0-38e5-57b0-e053-6c86abc0aa19
Short DOI doi:10/d898
Citation text Brown J.; Pullen T.; Silva E.; Prime T.; Yelland M.J.(2020). WireWall project numerical wave overtopping volume estimates at Crosby Hall Road Carpark (north of Liverpool UK) using a beach profile in 1996 and three in 2017, estimates are for coastal conditions when there is photographic evidence of overtopping occurring between 2013 - 2017. British Oceanographic Data Centre, National Oceanography Centre, NERC, UK. doi:10/d898.