In 2011 a Tracer study was carried out along the Portsmouth frontage between Old Portsmouth in the west and Fort Cumberland in the east. This section of the coastline is predominantly a shingle beach, but different parts of the frontage behave in different ways, particularly after storm events. Some areas gaining sediment, some areas losing sediment and some areas experiencing no net loss or gain of sediment due to changing patterns of littoral drift.
A total of 1,800 pebbles were then released at 12 different sites along the Portsmouth frontage between March and September 2011. Pebbles were deployed along the beach at the approximate location of Mean Sea Level (0.17 mOD).
Figure showing the location of the deployment sites at Eastney (Portsmouth) 2011, indicated by yellow starts
Figure showing the location of the deployment sites at South Parade (Portsmouth) 2011, indicated by yellow starts
Monitoring surveys were carried out to identify the position of the tracer pebbles. These surveys began after the first week of deployment and were carried out approximately every 1-2 months for the first year in the field, up until 2012. Full results of the study between 2011 and 2012 can be found in the report here.
- Click here to see results for the Eastney deployments during the 2011-2012 Portsmouth study
- Click here to see results for the South Parade deployments during the 2011-2012 Portsmouth study
- Click here to see results for the Southsea Common deployments during the 2011-2012 Portsmouth study
An additional monitoring survey was conducted in 2016 to identify whether pebbles could still successfully be located. A full report detailing the results from the additional survey in 2016 will be made available on the website once ready.