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SCOPAC Committee

Coastal Monitoring

The Southern Coastal Group (SCG)

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

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Cllr Mrs M Penfold MBE, West Dorset District Council

Vice-Chair

Cllr Jackie Branson, Havant Borough Council

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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

The Havant, Portsmouth and Gosport Group have developed a new shingle tracer study technique using Radio-Frequency Identification (RFID) technology to track pebbles moving around the East Solent coastline.

The pebbles were collected from the study area, drilled and a tag inserted, before being measured and deployed back onto the beach. Each tracer pebble has a unique identification number, and can be detected up to a metre deep within the beach without the need to dig up the pebble.

Click to download the document (pdf, 3Mb)

Now online

Sediment Tracer Report (pdf, 3Mb)

The tags do not rely on battery power and should work for 50 years.

See www.escp.org.uk/beach-sediment-tracer-study for more information on the technique being used.

The study was carried out to supplement the South West Hayling Island Beach Management Study.

£1,500 was provided by SCOPAC to assist with the preparation costs of the tracer pebbles.

Clive Moon reports…

A total of 2,300 tracer pebbles have now been deployed around the Hayling and Portsea Island open coast as part of an ongoing study to confirm the long-term sediment pathways in the East Solent. The deployment locations include the nourished beach at Eastoke, either side of the Langstone Entrance Channel and the Southsea frontage (Figure 1).

Click to enlarge this image

Eastoke deployment 1 -  results to date

On Hayling Island, 10% of the original batch of 300 tracers deployed in September 2010 were detected in June 2011 after 9 months active in the beach. The tracers have moved west between 25 and 1900 metres and continue to move in a westerly direction towards the Langstone Harbour entrance channel.

Eastoke deployment 2 - results to date

Of the 1,000 tracers deployed immediately after the 2011 beach recycling operation at Eastoke, 24% were detected after nearly three months active in the beach.  The tracers remain largely on the nourished frontage, and are following the anticipated pattern of sediment transport. The tracers deployed at the drift divide have dispersed in both directions along the nourished frontage but the centre of the mass of tracers remains near the deployment location, whereas the batches placed further away from the drift divide show a clearer pattern of movement downdrift in both directions.


Click to enlarge this image

Langstone Harbour entrance channel - results to date

On the Hayling Island side of the Langstone Harbour channel, 14% of the 250 tracers deployed in January at Gunner Point were detected in the latest sweep.  The tracers continue to move westwards into the Langstone Harbour entrance channel.

Click to enlarge this image

The deployment on the west side of the Langstone Harbour entrance is returning interesting results already, showing that sediment does bypass the Fort Cumberland outfall, initially thought to act as a permanent obstruction to sediment moving along the Eastney spit.

Southsea deployments - results to date

Tracer pebbles have been deployed at the Southsea Memorial (between Southsea Castle and Clarence Pier).  These pebbles are currently moving in the anticipated east to west direction as outlined in the SCOPAC Sediment Transport Study.

Still, the tracer pebbles deployed between Southsea Castle and South Parade Pier are moving in a west to east direction which is not the assumed direction of drift outlined in the SCOPAC Sediment Transport Study.  Longer term monitoring of the tracer pebbles will deduce if this is a seasonal variation or whether the drift is consistently west to east.

A towed RFID antenna array has been constructed to assist in detecting a larger number of tracer pebbles in one sweep (photo right).  In addition, the handheld antenna has had additional batteries installed to increase the survey duration between recharges.  The tracer pebbles can be detected up to a 1 metre depth.  Those tracer pebbles not recovered will either be buried too deep in the beach or will be taken offshore.

The study is programmed to finish in March 2012.

SCOPAC has awarded the Havant, Portsmouth and Gosport Group a further £4,000 for 2012-2013 to undertake additional sediment tracer study trials.


Sediment Tracer Studies Phase I, East Solent

SCOPAC £1,500

Minor Funds Contribution 2010-2011