SCOPAC Visit to Poole Bay and Poole Harbour
Total Page:16
File Type:pdf, Size:1020Kb
SCOPAC visit to Poole Bay and Poole Harbour Name: Neil Watson Job title: Coastal Engineer Date: 20 May January 2016 You are here! Name: Neil Watson Job title: Coastal Engineer Date: 30th September 2014 Dorset Coast from space copyright Chis Hadfield 2013 Bus route locations: 1. RNLI Poole ? 2. West Overcliff Drive 3. Boscombe Promenade 1 3 2 Shoreline Management Plans – Adopted July 2011 National Policy – National Strategy – Plans – Local Strategies - Schemes Poole Bay, Poole Harbour and Wareham flood and coastal erosion risk management strategy Overview of Strategy Issues • Increasing flood and erosion risks (700mm sea level rise by 2100), leading to; • Over 10,000 properties at risk by 2110, and • Present Value of benefits £1.75billion • Developed areas justify Holding the Line and undeveloped areas are highly valued • 44ha intertidal habitat loss in the short term due to coastal squeeze in SPA/Ramsar sites • Management of the Wareham tidal banks is unsustainable in the medium to long term • Fluvial/surface water issues are outside the Strategy but need to be considered Poole Bay Topography National Policy – National Strategy – Plans – Local Strategies - Schemes Historic evolution of Poole & Christchurch Bays National Policy – National Strategy – Plans – Local Strategies - Schemes Erosion risk and storm damage View East from Southbourne storm damage behind sea wall scour and erosion National Policy – National Strategy – Plans – Local Strategies - Schemes Source: Bournemouth libraries Coast Protection – Evolution of response 1. Sea wall & promenade 1 building 2. Slope 2 stabilisation 3. Toe protection 4. Groyne 3 4 building 5. Beach nourishment 5 Coast Protection – Timber Groyne replacement 1 2 3 4 5 Coast Protection – Branksome Dean Chine rock groyne construction 2008 1 2 3 4 5 Poole Bay, Poole Harbour and Wareham flood and coastal erosion risk management strategy Implementation Priorities - works recommended before 2030 Recommended works When Central funding / Amendment Coastal Cost £k to SMP policy Squeeze Hengistbury Head to Sandbanks 0-20 years None Beach management Most or All / 26,700 No (every year) None Luscombe Valley None (maintenance only) No Loss Lower Parkstone None (maintenance only) No Loss Central Poole Improve defences 1-10 years Some / 13,900 No Loss Hamworthy None (maintenance only) No Loss Rockley Sands None (private expense) No None Lytchett Bay Managed realignment 5-10 years Some-Most / 2,360 No Gain** Wareham Banks and Ridge Some managed realignment Loss and 5-10 years* Most or All / 17,200 Partly1 (& minimum maintenance) Gain** Poole Harbour South No works No None Brownsea Island No works (local maintenance No None at private expense) Studland and Ballard Down None No None Swanage Beach management No None Durlston Bay Cliff stabilisation On-going No None * Habitat compensation to start in year 1 ** Subject to implementation of managed realignment 1 Wareham Banks The SMP Policy is for managed realignment of the tidal banks. The Strategy recommendation is for minimum maintenance whilst this is sustainable. .