Issue: 45 | December 2016
Our last newsletter of 2016 includes a summary about our Annual Partners Meeting, and some information of how we plan to manage the new OSTN15/OSGM15 transformation, which is integral to practically all the data we collect.  With the winter of 2013/14 still quite fresh in the memory, this edition’s feature article discusses the spatial impact of the November storm in the eastern English Channel.
Geodata Institute, University of Southampton, has recently been awarded the new data management contract for the website and as we move into our new phase, in April 2017, we will be giving the website a refresh.  We welcome suggestions for revisions or additions, from our partners and other users of the website – please send your thoughts via the website feedback link.
We wish all our partners, colleagues and subscribers a very happy Christmas.

Travis Mason – Regional Co-ordinator
Annual Partners’ Meeting
The 2016 Annual Partners' Meeting was held in Worthing on Thursday 3rd November and we were pleased to welcome coastal engineers and colleagues from organisations we work with, as well as representatives of the Northeast, Anglian and Southwest Regional Coastal Monitoring Programmes.  We started with an update on the Programme’s activities during the past year, including some marvellous images of the recently-completed Shoreham to Selsey Bill swath bathymetry, followed by a keynote address from Nick Lyness, Wessex Flood and Coastal Risk Manager, Environment Agency, who discussed the continual need for monitoring at local, regional and national scales, and the challenges of getting the decision makers on board.  The afternoon session contained case studies and new research, including the process of habitat mapping our 2013 aerial photography, ecological enhancement of coastal defence structures and the changes which have occurred along Pagham Spit.  Presentations from the day can be viewed here.  
Fairlight Cove Rock Berm

Canterbury City Council recently undertook an engineering scheme which involved the design and construction of a new rock revetment to try and reduce the rate of erosion of unprotected sandstone cliffs at Fairlight Cove, East Sussex. This rock revetment joined the two revetments already in place. The rock revetment, constructed to +6.0 mOD should have a 50 year life and will provide protection to 165 houses.

Before the scheme was constructed, the Coastal Monitoring team at CCC carried out a static laser scan of the site, with the help of CCO. The scan provided a detailed point cloud of the site and vegetated cliff face. The coastal monitoring team will be undertaking another laser scan of the cliffs and revetment in the New Year.
Furthermore, Canterbury City Council finished their topographic surveys for the autumn of 2016. They surveyed 33 management units in Kent and East Sussex between the months of October and November. CCC is now looking forward to 2017; the completion of Phase III and the start of Phase IIII will certainly keep our surveyors busy.
OSTN15: The updated transformation for the UK and Ireland

On 26th August 2017, Ordnance Survey adopted a new transformation OSTN15/OSGM15 to convert from ETRS89 to OSGB36 co-ordinates. The switch is due to an improvement made by Ordnance Survey in their techniques collecting gravity data. Consequently, a new geoid model has been produced for UK and Ireland, called OSTN15. The geoid is used to link positions recorded using GNSS with national coordinate systems, giving an accurate 3D location within the UK.  Further information on OSTN15, the geoid and this update can be found on the OS website.  The document “OSGM15 and OSTN15: Updated transformation for UK and Ireland” (M.Greaves et al., Geomatics World, July/August 2016) is particularly useful and can be found here

CCO have converted survey control coordinates derived using OSTN02/OSGM02 via the new transformation and found that there is a general increase of 25 mm in height on most points, while positional change is minimal (<10 mm).  Nationally however, the change can be anything between + 0.3 m to -0.3 m; the main areas for larger differences are western areas of Scotland and the Isles of Scilly.   

All surveys from 1st January 2017 will be conducted using OSTN15/OSGM15.  As yet, there are no plans to re-process all earlier data with the new transformation, but testing is underway to assess the impact of the new transformation on difference models.  All data on the website will include the OSTN/OSGM model in the metadata.
Storm Angus

The first named storm of the 2016/17 season – Storm Angus – passed eastwards along the English Channel between 21:00 on 19 November and 12:00 on the 20th. The storm tracked relatively far south and caused high waves between Dawlish and Goodwin Sands. 
Storm Angus hitting the south coast. Copyright: 
In Poole Bay, some of the largest waves were observed since the start of the measurements in 2003. The Boscombe Directional Waverider (DWR) measured a maximum significant wave height of 4.18 m, which constitutes a 1 in 20 years return period and is the highest ever recorded at the site. Similarly, the Swanage Pier wave radar recorded a significant wave height of 1.74 m, which is also the highest ever recorded at this location.
Boscombe DWR recorded a maximum significant wave height of 4.18 m
Poole Harbour Commissioners tide gauge recorded a 0.86 m surge at 03:00
Fortunately, the peak of the storm did not coincide with High Water in Poole Bay, and it was not spring tides, but there was a 50 cm storm surge along most of the south coast.  Storm waves damaged part of the seawall in Swanage and several roads and businesses were flooded at the bottom of the High Street.
Damage caused to the sea wall at Swanage. Copyright: Environment Agency
Further east, a particularly impressive wave of 7.3 m was measured by the Pevensey Bay DWR at 06:00Z.
Southeast Regional Coastal Monitoring Programme
Area Representatives

Isle of Grain to Beachy Head 
Claire Milburn, Canterbury City Council, 
01227 862 537

Beachy Head to Selsey Bill    
Dan Amos, Adur & Worthing Councils,
01903 221376
Selsey Bill to Portland Bill
Stuart McVey, New Forest District Council,
02380 598641

Channel Coastal Observatory
02380 598467
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Channel Coastal Observatory · National Oceanography Centre · European Way · Southampton, Hampshire SO14 3ZH · United Kingdom

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