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Abpmer Report No. R.3155 Solent Forum Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Feasibility Review for Sediment Recharge Project(s) on the West Solent Saltmarshes February 2020 Page intentionally left blank Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Feasibility Review for Sediment Recharge Project(s) on the West Solent Saltmarshes A report for the Solent Forum February 2020 Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Solent Forum Document Information Document History and Authorisation Title Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Feasibility Review for Sediment Recharge Project(s) on the West Solent Saltmarshes Commissioned by Solent Forum Issue date February 2020 Document ref R.3155 Project no R/4701/3 Date Version Revision Details 8 March 2019 1 Progress Working Copy for Client Update 26 April 2019 2 Progress Working Copy for Client Comment 28 October 2019 3 Issued for Client and Steering Group Comment 27 February 2020 4 Issued for Client Use Prepared (PM) Approved (QM) Authorised (PD) Colin Scott Susanne Armstrong Stephen Hull Suggested Citation ABPmer (2020). Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2, Feasibility Review for Sediment Recharge Project(s) on the West Solent Saltmarshes, ABPmer Report No. R.3155. A report produced by ABPmer for Solent Forum, February 2020.. Acknowledgements We would like to thank the many people and organisations that were consulted and provided information during this project. This includes members of the Technical Group overseeing the BUDS project as well as a wide range of interested parties and industry specialists who provided input during the consultation process and the BUDS workshops (see Section 2.1). We are also very grateful to the Environment Agency who provided a grant to support this study. Notice ABP Marine Environmental Research Ltd ("ABPmer") has prepared this document in accordance with the client’s instructions, for the client’s sole purpose and use. No third party may rely upon this document without the prior and express written agreement of ABPmer. ABPmer does not accept liability to any person other than the client. If the client discloses this document to a third party, it shall make them aware that ABPmer shall not be liable to them in relation to this document. The client shall indemnify ABPmer in the event that ABPmer suffers any loss or damage as a result of the client’s failure to comply with this requirement. Sections of this document may rely on information supplied by or drawn from third party sources. Unless otherwise expressly stated in this document, ABPmer has not independently checked or verified such information. ABPmer does not accept liability for any loss or damage suffered by any person, including the client, as a result of any error or inaccuracy in any third party information or for any conclusions drawn by ABPmer which are based on such information. All content in this document should be considered provisional and should not be relied upon until a final version marked ‘issued for client use’ is issued. All images on front cover copyright ABPmer. ABPmer Quayside Suite, Medina Chambers, Town Quay, Southampton, Hampshire SO14 2AQ T: +44 (0) 2380 711844 W: http://www.abpmer.co.uk/ ABPmer, February 2020, R.3155 | i Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Solent Forum Non-Technical Summary Project background This report reviews the work undertaken for Phase 2 of the Solent Forum’s ‘Beneficial Use of Dredge Sediment in the Solent’ (BUDS) project. This second phase of the BUDS project involved investigating the feasibility, and value, of conducting a major new beneficial use project (or multiple projects) on the West Solent saltmarshes along the Hurst Spit to Lymington frontage (see Image NTS1). Image NTS1. Location of the West Solent marshes The Solent Forum started the BUDS project in 2017, following requests from its members who were keen to see more of the region’s dredged sediment used to restore and protect its deteriorating intertidal habitats. Phase 1 of the BUDS project involved a high-level review of the Solent region to identify sites that would gain most from a beneficial use campaign. These were sites where dredge arisings (silts mainly) could be used to ‘recharge’ deteriorating habitats and achieve a range of environmental, social and economic objectives (especially increased coastal flood protection). Alongside this strategic review, a key aim of this initial stage was to begin developing collaborative partnerships with those willing to support one or more recharge initiatives, especially at a large scale. The Phase 1 strategic review was completed in March 2018. It recommended that the next phase should involve actively progressing one or more project(s) while also working with regulatory bodies to help develop guidance and provide oversight. It was envisaged that this oversight would then help identify major new projects which stakeholder partnerships could support as well as smaller-scale schemes that individual operators and harbour authorities would like to progress. ABPmer, February 2020, R.3155 | ii Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Solent Forum The Phase 1 review also concluded that a ‘stand out’ candidate site for recharge work was along the Hurst Spit, Keyhaven, and Lymington frontages. In this area, the marshes are rapidly eroding and they play a key role in coastal and harbour protection as well as being of high conservation value. Therefore, a recharge project pursued along this frontage could achieve substantial and multiple benefits. The Phase 1 work further showed that there was a great deal of willingness, across a wide range of stakeholders, for such projects to be realised. Phase 2 Objectives To progress the recommendations from Phase 1, this second stage of the BUDS project involved investigating the ‘real world’ feasibility of conducting valuable beneficial use project(s) on the West Solent saltmarshes. Key objectives for this phase were to: . Clarify how, and where, dredge sediments can be beneficially placed on these marshes; . Understand the costs and benefits of possible initiatives on a more site-specific basis; and . Recommend how practical projects can be pursued in BUDS Phase 3 and further define the roles that different stakeholders might play in future initiatives. The results obtained from this review are designed not only to determine how and whether a project might go ahead in the West Solent, but also to provide information to help guide other projects in the Solent and, it is hoped, more widely in the UK and internationally. This second stage was made possible by an Environment Agency grant, and is being overseen by the BUDS Technical Group, which includes technical specialists and representatives from a range of stakeholder groups. Further details and all products from the BUDS project can also be found on the Solent Forum website1. Phase 2 Methods To progress the BUDS Phase 2 study, a number of different tasks were carried out. These were progressed through the following four-stages: . Stage 1 Baseline Conditions and Background Review: To provide a contextual foundation for this review, existing conditions in the West Solent were reviewed through analyses of: . The condition of the marshes and the rate at which they are declining; . The local distribution of breeding and overwintering bird populations; . The existing dredging activities in the West Solent; . The (ecosystem service) benefits of the West Solent saltmarshes2; and . The main consenting/licensing issues. Stage 2 Technical Options Review: As the second stage in the process, possible locations and approaches for a recharge campaign (or campaigns) across the area were identified and evaluated. Four possible recharge ‘Project Examples' were then selected for further review; . Stage 3 Cost and Benefits Analysis: The anticipated costs and benefits of the four Project Examples were then assessed. This task was important because, as noted in Phase 1, understanding about the costs and benefits of recharge projects is currently very poor; and . Stage 4 Review of funding opportunities: A brief review of possible future funding sources and mechanisms was undertaken based on existing literature and stakeholder consultation. 1 http://www.solentforum.org/services/Current_Projects/buds/ 2 The benefits of the West Solent marshes were also mapped/illustrated to inform this review and future engagements with possible partners and the public. ABPmer, February 2020, R.3155 | iii Beneficial Use of Dredge Sediment in the Solent (BUDS) Phase 2 Solent Forum Throughout this process, regular consultations and meetings were held with partners, stakeholders and dredging specialists. In response to this work, recommendations were then made for implementing a project or projects in Phase 3. These were placed in context of the background to, and aims of, the BUDS project and are to be agreed and developed with project partners. Phase 2 Results Stage 1 Baseline Conditions and Background Review It is now very well established that the West Solent marshes are rapidly declining. The baseline review of marsh extent and condition carried out for this study, quantifies the losses at around 2% of vegetated marsh area and 2% of the marsh volume each year. If there is no active intervention, it is likely that this proportionate rate of loss will increase over time as the marshes decrease in size and fracture and also respond to the effects of sea level rise. Therefore, the vegetated marshes will probably be gone by around 2045-2050. These findings have built on, and confirmed, earlier work and were supported by a detailed analysis of shoreline elevation data as well as aerial imagery derived from a project-specific drone survey. Saltmarshes are important ‘natural capital’ assets which provide many valuable ecosystem services. They have inherent ecological value in their own right but also: have a nature watching/amenity function; act as fish nurseries and foraging grounds; bury carbon; and act as ‘wave breaks’.
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