New sources of literature from 2002 to 2012 identified by the updated SCOPAC Bibliographic Database were reviewed and relevant information was summarised and incorporated into the descriptive text.

Net beach sediment transport volumes were produced from long-term difference models from two surveys broadly either 10 years (Southeast) or 5 years (Southwest) apart, dependent on data availability. Typically, topographic survey data was used for the difference modelling, supplemented by lidar data if the topographic data proved less suitable. Sediment budgets were subsequently derived (for those maps where sufficient data was available to support a reasonable budget calculation) according to the principles of Sediment Budget Analysis System (SBAS) (Rosati and Kraus 1999). The sediment budgets concentrated on change above Mean Low Water since very little information was available about sub-tidal or river and estuarine net sediment volume change. Cliff inputs were estimated from lidar or aerial photography. Engineering intervention was included in the sediment budgets in terms of beach replenishment and/or recycling volumes. Budgets were balanced across each map, and within a coastal sediment transport sub-cell (Motyka and Brampton 1993), and the resulting sediment transport rates and directions were compared to those shown in the 2004 mapping.

Any resulting anomalies with the 2004 Sediment Transport Study were subsequently discussed with local coastal engineers. Only where there was substantive evidence, either from the sediment budget analysis or from recent literature, that a 2004 arrow was no longer appropriate in some way, was the arrow modified and an explanation included in the supporting text. If new results or literature served to confirm or validate 2004 mapping, this was noted in the text whilst where results were inconclusive, no changes were made to either the mapping or the text.

REFERENCES

ROSATI, J. AND KRAUS, N. (1999). Sediment Budget Analysis System (SBAS). US Army Corps of Engineers.

MOTYKA, J. AND BRAMPTON, A. (1993). Coastal Management, Mapping of Littoral Cells. HR Wallingford.

Methods

About the Study

SCOPAC Committee

Chairperson Councillor Mrs M Penfold MBE, West Dorset District Council.

Vice-Chair Councillor Jackie Branson, Havant Borough Council.

Technical assistance provided to Councillors by Mr Lyall Cairns (Southern Coastal Group Chair) and Dr Samantha Cope (SCOPAC Research Chair).

The STS 2012 update

The 2012 update of the SCOPAC Sediment Transport Study (STS) was funded by the Environment Agency under FDGiA, grant number LDW 41230, with additional contributions from SCOPAC.  

It is referenced as: New Forest District Council (2017). 2012 Update of Carter, D., Bray, M., & Hooke, J., 2004 SCOPAC Sediment Transport Study, www.scopac.org.uk/sts.

Sediment Transport Study 2012