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River Hamble Soft Sediment Habitat Retention

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River Hamble Soft Sediment Habitat Retention AHTI LTD & MARINE SPACE LTD RIVER HAMBLE SOFT SEDIMENT HABITAT RETENTION Feasibility Study DATE OF ISSUE 12 August 2016 RIVER HAMBLE SOFT SE DIMENT HABITAT RETEN TION FEASIBILITY STUDY PREPARED FOR PREPARED BY Hampshire County Council AHTI Ltd. River Hamble Harbour Authority Unit 16, Highcroft Industrial Estate Harbour Master’s Office Enterprise Road Shore Road Waterlooville Warsash Portsmouth Hants. Hants. SO31 9FR PO8 0BT http://www3.hants.gov.uk/hambleharbour.htm www.ahtigroup.co.uk Phone: 01489 576387 Phone: 07765 384272 Email: [email protected] Email: [email protected] DOCUMENT RELEASE AND AUTHORISATION RECORD Job Number AHTI_J2015_004 Client Name River Hamble Harbour Authority Client Contact Alison Fowler Date 12/08/2016 Status Date Issued Final 12/08/2016 This Version Authorised By Name Date Signature Dr Simon Bray Authors Dr Ilse Steyl 12/08/2016 Dr Dafydd Lloyd Jones Technical Reviewer Dr Ilse Steyl 12/08/2016 Quality Checker Mrs Joanna Gillman 12/08/2016 COPYRIGHT The copyright and intellectual property (IP) rights in this document are the property of the client, River Hamble Harbour Authority (RHHA) and of the consultants AHTI Ltd & MarineSpace Ltd with express agreement from RHHA. This document shall not be copied, nor IP infringed, without the express consent of the client or its consultants. AHTI_J2015_004 i RIVER HAMBLE SOFT SE DIMENT HABITAT RETEN TION FEASIBILITY STUDY Contents ABBREVIATIONS.......................................................................................................................................... viii EXECUTIVE SUMMARY.................................................................................................................................. ix 1. INTRODUCTION AND BACKGROUND.................................................................................................... 1 1.1 Project Context ............................................................................................................................. 1 1.2 Solent and River Hamble Overview .............................................................................................. 2 1.2.1 Solent .................................................................................................................................... 2 1.2.2 River Hamble Background .................................................................................................... 6 1.3 Project Questions ....................................................................................................................... 10 2. SALTMARSH EXTENT AND HABITAT QUALITY .................................................................................... 12 2.1 Data Sources ............................................................................................................................... 12 2.2 Change Analysis .......................................................................................................................... 12 2.2.1 Hacketts Marsh ................................................................................................................... 17 2.2.2 Lincegrove Marsh ............................................................................................................... 21 2.2.3 Mercury Marsh ................................................................................................................... 24 2.2.4 Satchell Marsh .................................................................................................................... 27 2.2.5 Little Marsh ........................................................................................................................ 30 2.2.6 Hamble Common Marsh .................................................................................................... 33 2.2.7 Hook Marsh ........................................................................................................................ 36 2.2.8 Bunny Meadows South Marsh ........................................................................................... 38 2.2.9 Bunny Meadows North Marsh ........................................................................................... 41 2.2.10 Crableck Marsh ................................................................................................................... 44 2.2.11 Universal Marsh.................................................................................................................. 47 2.2.12 Swanwick Marsh ................................................................................................................. 50 2.3 Habitat Quality ........................................................................................................................... 53 2.4 Summary .................................................................................................................................... 56 3. FACTORS CONTRIBUTING TO AREA AND QUALITY REDUCTION ........................................................ 57 3.1. Introduction ................................................................................................................................ 57 3.2 Reasons for saltmarsh decline .................................................................................................... 57 3.3 Impact of dredging on sediment draw-down ............................................................................. 64 3.3.1 A conceptual model ............................................................................................................ 64 3.3.2 How do estuaries respond to dredging? ............................................................................ 65 3.4 Potential for reduced sediment supply ...................................................................................... 67 ii AHTI_J2015_004 RIVER HAMBLE SOFT SE DIMENT HABITAT RETEN TION FEASIBILITY STUDY 4. SEDIMENT DEPOSITION ...................................................................................................................... 72 4.1 Introduction ................................................................................................................................ 72 4.2 Sediment composition and quantities from dredging ............................................................... 72 4.3 Suitability of River Hamble dredge material for reuse ............................................................... 74 4.4 Summary .................................................................................................................................... 78 5. SUITABILITY OF HAMBLE ESTUARY FOR HABITAT IMPROVEMENT .................................................... 79 5.1 Introduction ................................................................................................................................ 79 5.2 Suitability of intertidal areas for reuse of dredge spoil .............................................................. 79 5.2.2 Remarks on MCA .............................................................................................................. 122 5.3 Potential for other sediment management techniques ........................................................... 122 5.3.1 Flow Modification ............................................................................................................. 122 5.3.2 Wave energy reduction .................................................................................................... 124 5.3.3 Bunds to hold material on the foreshore. ........................................................................ 125 5.3.4 Vegetation Planting .......................................................................................................... 127 5.3.5 Scheme Risks .................................................................................................................... 128 5.4 Potential environmental benefits of sediment management schemes ................................... 131 5.5 Potential adverse environmental impacts ............................................................................... 134 5.5.1 Environmental Effects Associated with Deposition of Dredged Material ........................ 135 5.5.2 Direct Environmental Effects ............................................................................................ 136 5.5.3 Indirect Environmental Effects ......................................................................................... 137 5.5.4 Long-term Benefits ........................................................................................................... 138 5.6 Potential for increased accretion from disposal of dredge spoil ............................................. 139 5.6.1 Foreshore recharge .......................................................................................................... 139 5.6.2 Direct pumping or sediment placement .......................................................................... 140 6. POTENTIAL SOURCES OF FUNDING .................................................................................................. 149 6.1 Introduction .............................................................................................................................. 149 6.2 Esmée Fairbairn Foundation .................................................................................................... 149 6.3 The Landfill Communities Fund ...............................................................................................
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