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SCOPAC Committee

Coastal Monitoring

The Southern Coastal Group (SCG)

www.channelcoast.org www.southerncoastalgroup.org.uk

Chairperson

Cllr Mrs M Penfold MBE, West Dorset District Council

Vice-Chair

Cllr Jackie Branson, Havant Borough Council

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Technical assistance provided to Councillors by

Mr Neil Watson (Environment Agency) and

Dr Samantha Cope (SCOPAC Research Chair)

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Current Research

SurgeWatch: a user-friendly database of coastal flooding for the UK

SCOPAC Contaminated Land Study

Scanning of historical aerial photography

Beach response in front of structures in open coast

Poole Bay Nearshore Replenishment Trial

Reducing regional flood and erosion risk from wave action on the Channel Coast

Maintenance of coastal structures - Phase 1: Timber groynes

Completed Research

Bradbury’s Bursary: investigating the physical and geotechnical properties of the substrate in the lee of Hurst Spit

SCOPAC Sediment Transport Study update 2012

Offshore to onshore transport across distinct landforms at Church Norton Spit: Minor Funds Contribution 2015-2016

Coastal sediment budget project: Minor Funds Contribution 2013-2016

Seabed Mapping Selsey to Eastoke: Minor Funds Contribution 2013-2015

Sediment Tracer Study Phase II: Minor Funds Contribution 2011-2013

Non-standard Rock Groynes: Minor Funds Contribution 2011-2013

Sediment Tracer Study Phase I: Minor Funds Contribution 2010-2011

ACCESS Project 2011

Extreme Wave Conditions within the SCOPAC region 2008-2010

Strategic Regional Coastal Monitoring

RESPONSE European Project 2006-2009

RESPONSE European Project Maps

SCOPAC Sediment Transport Bibliographic Database (v6, 2012)

SCOPAC Sediment Transport Study 2004

Evolution of the Solent River animation

Evolution of Lyme Bay animation

Preparing for the Impacts of Climate Change 2001

Professor A Bradbury £10,000 (2008/09) and £8,000 (2009/10)

2008 - 2010. A review of regional wave climate and implications for shoreline management - extremes, swell, bimodal conditions.  

Extreme Wave Conditions within the SCOPAC region

The investigation into extreme wave conditions in the SCOPAC region by Professor Andy Bradbury is now largely complete.   

Key conclusions from the investigation into extreme wave conditions in the SCOPAC region by Professor Andy Bradbury suggest that the central south coast is regularly subject to conditions that are not generally considered in scheme design. Current scheme design does not account for bi-modal conditions, where there is a combination of not only wind waves but swell waves also. The implication is that greater overtopping and wave run-up on beaches might be expected than traditional design advice might suggest.

Consequently defences in most of the SCOPAC region are not designed to a high enough standard. Most of the Solent shoreline is unaffected by these conditions as it is protected by the Isle of Wight from swell waves, until you reach Hayling Island where the bi-modal conditions are present.

The conclusions support the need for a change in the design approach where these conditions are present. This is likely to take several years and considerable additional (national) funding to deal with.  

Click to enlarge this image

A screenshot from the CCO website

As an interim measure, steps have been taken to modify the CCO website to identify these conditions routinely in real time:

view data from one of the buoys.

All wavebuoy sites are now enabled with this technology and can be accessed via the realtime wave pages.  A series of trigger levels have been established for which a text or email alert can be sent when these conditions occur.

This is realistically as much as this project can expect to deliver.

The problem arising from the research conclusions has already been highlighted to the EA Sustainable Asset Management Theme Advisory Research Group (SAMTAG), to a workshop for the EA flood forecasters, and a section of the new CIRIA Beach Management Manual now includes a reference to it.

Some very senior UK coastal engineers have considered this to be a major issue. Following on from the SCOPAC project, a £250,000 region-wide study entitled "Reducing regional flood and erosion risk from wave action on the Channel Coast" has been funded by central government Flood Defence Grant in Aid.

The three year study will undertake a region-wide assessment of design wave conditions and beach responses between Start Point, Devon and Pevensey, Sussex in preparation for improvements to definition of standards of service of coastal schemes, improved flood forecasting, and improved definition of design wave conditions.

This is exactly what SCOPAC had hoped for and demonstrates once again how valuable both the regional coastal monitoring programme and the SCOPAC research programmes are.

Papers relating to the SCOPAC project are as follows:


A.P. Bradbury, T.E. Mason and T. Poate (2007)

Implications of the spectral shape of wave conditions for engineering design and costal hazard assessment - evidence from the English Channel

download (450kb)

A.P. Bradbury and T.E. Mason (2009)

An inter-comparison of hindcast and measured wave data: implications for beach recharge design

download (1.5Mb)

Andrew Bradbury, Mark Stratton and Travis Mason (2011)

Impacts of wave climate with bi-modal wave period on the profile of gravel beaches

download (300kb)