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Report Template V2.4 Poole Bay & Harbour Coastal Group POOLE BAY & HARBOUR STRATEGY STUDY Assessment of Flood and Coast Defence Options POOLE BAY Halcrow Group Limited Poole Bay & Harbour Coastal Group POOLE BAY & HARBOUR STRATEGY STUDY Assessment of Flood and Coast Defence Options POOLE BAY Halcrow Group Limited Halcrow Group Limited Burderop Park Swindon Wiltshire SN4 0QD Tel +44 (0)1793 812479 Fax +44 (0)1793 812089 www.halcrow.com Halcrow Group Limited has prepared this report in accordance with the instructions of their client, Poole Bay & Harbour Coastal Group, for their sole and specific use. Any other persons who use any information contained herein do so at their own risk. © Halcrow Group Limited 2004 Halcrow Group Limited Burderop Park Swindon Wiltshire SN4 0QD Tel +44 (0)1793 812479 Fax +44 (0)1793 812089 www.halcrow.com Poole Bay & Harbour Coastal Group POOLE BAY & HARBOUR STRATEGY STUDY Assessment of Flood and Coast Defence Options POOLE BAY Contents Amendment Record This report has been issued and amended as follows: Issue Revision Description Date Signed 0 1 Draft of Management 24 Oct 03 LSBanyard Unit PBY1 to Borough of Poole and Bournemouth Borough Council via ftp site 0 2 Draft to Coastal Group 6 Nov 03 LSBanyard via ftp site 1 0 Final to Borough of 28 Jan 04 LSBanyard Poole and Bournemouth Borough Council for Web Sites Contents 1 Introduction 1 1.1 What is a Coastal Strategy? 1 1.2 How does this Coastal Strategy relate to the Shoreline Management Plan? 1 2 Strategic Overview 5 2.1 The Need for Beach Recharge 5 2.2 Availability of Beach Recharge 5 2.3 Effect of Beach Recharge 6 2.4 Effect of the Hengistbury Head Long Groyne 6 2.5 Consultation on the Desirable Erosion Rate of PBY2 and PBY3 7 3 Poole Bay 9 3.1 Sandbanks Ferry Slipway to Point House Café – PBY 1 9 3.2 Point House Café to Warren Hill – PBY 2 40 3.3 Warren Hill to Hengistbury Long Groyne – PBY 3 49 4 References 57 Figures 1.1 Relationship between Strategy Study and SMP 1.2 Poole Bay Management Units 3.1 Residual Life of Existing Timber Groynes 3.2 Example of Timber Groynes 3.3 Example of Rock Groynes 3.4 Example of Rock Offshore Breakwaters 3.5 Example of Geotextile Bag Breakwaters 3.6 Addition of Rock Groynes – Year 0 3.7 Addition of Rock Groynes – Year 10 3.8 Addition of Rock Groynes – Year 20 3.9 Addition of Offshore Reefs – Year 0 3.10 Addition of Offshore Reefs – Year 10 3.11 Addition of Offshore Reefs – Year 20 3.12 Erosion Risk Areas 3.13 Shoreline Change 1978 – 2002 3.14 Location of Cross Sections – 3d view looking towards Hengistbury Head 3.15 Cross Section of Peninsular at Double Dykes 3.16 Location of Greatest Erosion between 1978 and 2002 1 Introduction 1.1 What is a Coastal Strategy? This document is part of the Poole Bay & Harbour Strategy, which defines methods by which coastal defence of the Hengistbury Head to Durlston Head (including Poole Harbour) should be managed in the next 50 years. The strategy builds on the work of the Poole and Christchurch Bays Shoreline Management Plan (SMP) Halcrow (1999) 1.2 How does this Coastal Strategy relate to the Shoreline Management Plan? The existing SMP defines the shoreline alignment policy (whether the existing alignment should be held, realigned or moved forward; or whether there should be only limited intervention or no action at all.) The current study is not an SMP, but it develops the SMP policies by appraising ways of implementing them. The range of strategic options will vary according to the section of coastline under consideration. The relationship between the SMP, Coastal Strategy and Scheme Development is shown in Figure 1.1. Figure 1.1 Relationship between Strategy Study and SMP 1 The shoreline of Poole Bay has been divided into a number of management units, as shown in Figure 1.2: • PBY1 – North Haven Point (Sandbanks) to Point House Café (Southbourne) • PBY2 - Point House Café (Southbourne) to Double Dykes • PBY3 – Double Dykes to Hengistbury Head Long Groyne Figure 1.2 Poole Bay Management Units This map is reproduced from the Ordnance Survey mapping with the permission of the Controller of Her Majesty’s Stationery Office (c) Crown copyright. All rights reserved. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution of Civil proceedings. Bournemouth Borough Council. Licence no LA077232.2003 In developing the Strategy for Poole Bay, a wide range of studies have been undertaken. The following provides a brief summary of those parts of the study that are of relevance to the PBY frontage. • Technical Annex 1 – Coastal Conditions – the coastal conditions affecting the shoreline have been assessed through modelling and calculations of wave conditions, extreme water levels, tidal cycles and joint probability between waves and water levels. • Technical Annex 2 – Beach Modelling – modelling of wave and water levels has been used to drive models of longshore and cross-shore sediment transport. In particular the degree of beach draw-down under storm conditions has bee modelled to assess the degree of beach protection required along the frontage. The performance of different types of beach control structure (groynes and breakwaters) has been evaluated using calibrated models of the beach movement. 2 • Technical Annex 3 – Shoreline Evolution – the location of the shoreline between Point House Café and Hengistbury Head Long Groyne (Management Units PBY2 & PBY3 in Figure 1.2) in 1978 and 2001 has been compared using geo-rectified aerial photographs. This method provides a more accurate comparison than the use of Ordnance Survey Mapping or conventional aerial photographs. The geo-rectified photographs were “stretched” electronically to fit the 2001 Ordnance Survey Landline (electronic mapping) and the uncertainties in the method calculated. • Technical Annex 5 – Coastal Processes – the sources of supply, movement and output of sediment within Poole Bay were identified using the computer modelling described in Technical Annex 2 and in HR Wallingford 2003 (tidal and wave modelling carried out for this Strategy Study). Where possible, the volumes of sediment movement were evaluated (with the measurement in cubic metres per year - m3/year). This information is essential to the assessment of why a particular shoreline may be eroding or accreting and in judging what the affect of any intervention on the coast may have. • Technical Annex 7 – Implications of Climate Change – the potential effects of the following factors associated with climate change have been evaluated and the potential implications for each management unit of the shoreline have been assessed: (i) changes in sea level, incorporating global (eustatic) sea level rise and land-level (isostatic) change (ii) changes in storm surge, due to changes in extremes of barometric pressure and wind stress caused by changing weather patterns (iii) changes in wind climate affecting the height, periods and directions of wave conditions (iv) changes in rainfall intensities, durations, and event frequencies, particularly affecting cliff slippage and run-off flooding • Technical Annex 8 – Flood and Coast Defence Benefits and Costs – the benefits and costs of strategy options have been estimated and presented in this report. Further details are included in Technical Annex 8. 3 • Technical Annex 9 – Sources of Beach Recharge – potential sources of marine aggregates for beach recharge have been identified and alternative sources have been briefly described. • Technical Annex 10 – Strategic Environmental Assessment (SEA) – This document contains the background data on which the Strategic Environmental Assessment is based (known as the baseline), which describes how the environmental objectives of the Strategy have been selected. Each of the options in the Strategy are then compared against these objectives to assess their environmental implications. 4 2 Strategic Overview 2.1 The Need for Beach Recharge The on-going need for beach recharge was identified in the SMP. Work carried out to assess the inputs, transport and output of sediment along the whole Poole Bay frontage (Technical Annex 5) confirms that, with the exception of Sandbanks, the potential for sediment loss from this frontage is considerably greater than the potential for sediment gain. This situation arises primarily from the cessation of erosion that resulted from the construction of seawalls along the frontage over the course of the last century. The alternative course of action to beach recharge would be demolition of the seawalls and of the properties that they protect. This was considered and rejected by the SMP. 2.2 Availability of Beach Recharge The availability of sand for beach recharge is described in more depth in Technical Annex 9. It is limited at present to: • Swash Channel and Middle Ship Channel (Entrance to Poole Harbour) – this could potentially supply 100,000m3 of suitable materials every 2 years through maintenance dredging • Swash Channel and Middle Ship Channel (Entrance to Poole Harbour) – this could potentially supply 1,000,000m3 (as a “one-off” supply) of suitable materials if a deepening of the shipping channels were to proceed • Licensed dredging sites located to the south-east and south-west of the Isle of Wight – these sites could provide suitable materials, but the costs would be higher than from the Swash Channel & Middle Shipping Channel since screening (large scale sieving) of the sediment would be required • For future recharges after 10 years, it is possible that a suitable materials might be available from a prospective licensed site at Dolphin Sand. A licence is being sought by a commercial aggregates company for the site. This is expected to hold suitable sediment which would not require screening and would be considerably closer than the alternative licensed sites. 5 2.3 Effect of Beach Recharge Sections of the beach in the PBY 1 have been recharged since 1970; more details of the past campaigns are given in Technical Annex 9.
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