Regional Beach Management Plan 2017: Selsey Bill to Climping Report – ENVIMSE100035/R-01 Final Report, August 2017 This series of regional Beach Management Plans for Southeast England are dedicated to the memory of Andy Bradbury. The data that has been used to compile them is only available due to Andy’s vision and drive for better coastal monitoring data to inform beach management. Dr Regional Beach Management Plan 2017 Selsey Bill to Climping Main Report Canterbury City Council Engineering Services Military Road Canterbury 1 CT1 1YW Photo credit: Chichester District Council CONTACTS Regional Coastal Monitoring Dan Amos, SDCG Data Analyst, Adur & Worthing Borough Council, [email protected] Managing Authorities Roger Spencer, Engineering Manager, Arun District Council [email protected] Dominic Henly, Senior Engineer, Chichester District Council [email protected] Project Team Uwe Dornbusch, Supra Area Coastal Engineer, Environment Agency, [email protected] Adam Shaw, Project Manager, Environment Agency, ADAM.SHAW@ENVIRONMENT–AGENCY.GOV.UK Alastair Pitcher, Project Executive, Environment Agency, [email protected] Authors Jonathan Clarke, Claire Milburn Andrew Stevens, Dominique Townsend, Hannah Dowsett, Robert Thomas [email protected] 1 CONTENTS CONTACTS .................................................................................................................................................................................................. 1 CONTENTS.................................................................................................................................................................................................. 2 LIST OF APPENDICES ............................................................................................................................................................................ 3 LIST OF FIGURES ..................................................................................................................................................................................... 4 LIST OF TABLES ....................................................................................................................................................................................... 5 EXECUTIVE SUMMARY ......................................................................................................................................................................... 6 1 INTRODUCTION ................................................................................................................................................................................... 7 1-1 PRESENT SITUATION .............................................................................................................................................................. 7 1-1-1 SMP AND OTHER STRATEGY POLICY ....................................................................................................................... 7 1-1-2 PHYSICAL CHARACTERISTICS AND COASTAL DEFENCES ........................................................................... 13 1-1-3 GEOLOGY ............................................................................................................................................................................. 17 1-2 HISTORY OF THE FRONTAGE ........................................................................................................................................... 23 1-2-1 FLOODING INCIDENTS.................................................................................................................................................. 23 1-2-2 EROSION INCIDENTS ..................................................................................................................................................... 23 1-2-3 HISTORY OF COASTAL MANAGEMENT ................................................................................................................. 24 1-2-4 ENVIRONMENTAL OPPORTUNITIES AND CONSTRAINTS ........................................................................... 28 1-2-5 AGRICULTURE .................................................................................................................................................................. 31 1-2-6 INFRASTRUCTURE ......................................................................................................................................................... 31 1-2-7 ARCHAEOLOGY & CULTURAL HERITAGE ............................................................................................................ 31 2 CURRENT RISK .................................................................................................................................................................................. 32 2-1 FLOODING .................................................................................................................................................................................. 32 2-2 OVERTOPPING ......................................................................................................................................................................... 32 2-3 EROSION ..................................................................................................................................................................................... 33 2-4 DAMAGE TO STRUCTURES ................................................................................................................................................. 33 2-5 AMENITY .................................................................................................................................................................................... 37 3 PHYSICAL INPUTS ............................................................................................................................................................................ 38 3-1 WATER LEVELS ....................................................................................................................................................................... 38 3-1-1 TIDAL WATER LEVELS ................................................................................................................................................. 38 3-1-2 EXTREME WATER LEVELS ......................................................................................................................................... 38 3-2 WAVES ......................................................................................................................................................................................... 40 3-2-1 WAVE RECORDER ........................................................................................................................................................... 40 3-2-2 MET OFFICE HINDCAST ............................................................................................................................................... 41 3-3 JOINT PROBABILITY ANALYSIS ....................................................................................................................................... 44 3-4 SEDIMENT CHARACTERISTICS ........................................................................................................................................ 46 3-5 BEACH GEOMETRY ................................................................................................................................................................ 46 4 HISTORICAL MONITORING .......................................................................................................................................................... 49 4-1 CONTROL NETWORK ............................................................................................................................................................ 49 4-2 TOPOGRAPHIC SURVEYS .................................................................................................................................................... 49 4-2-1 GPS ......................................................................................................................................................................................... 49 4-2-2 HISTORIC............................................................................................................................................................................. 52 4-3 BATHYMETRY .......................................................................................................................................................................... 52 4-4 BMP SITES .................................................................................................................................................................................. 52 4-5 AERIAL SURVEYS .................................................................................................................................................................... 52 4-5-1 AERIAL PHOTOGRAPHY ............................................................................................................................................... 52 4-5-2 LIDAR .................................................................................................................................................................................... 53 4-6 STRUCTURES ...........................................................................................................................................................................