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7. Dysynni Estuary West of Wales Shoreline Management Plan 2 Appendix D Estuaries Assessment November 2011 Final 9T9001 Haskoning UK Ltd West Wales SMP2: Estuaries Assessment Date: January 2010 Project Ref: R/3862/1 Report No: R1563 Haskoning UK Ltd West Wales SMP2: Estuaries Assessment Date: January 2010 Project Ref: R/3862/1 Report No: R1563 © ABP Marine Environmental Research Ltd Version Details of Change Authorised By Date 1 Draft S N Hunt 23/09/09 2 Final S N Hunt 06/10/09 3 Final version 2 S N Hunt 21/01/10 Document Authorisation Signature Date Project Manager: S N Hunt Quality Manager: A Williams Project Director: H Roberts ABP Marine Environmental Research Ltd Suite B, Waterside House Town Quay Tel: +44(0)23 8071 1840 SOUTHAMPTON Fax: +44(0)23 8071 1841 Hampshire Web: www.abpmer.co.uk SO14 2AQ Email: [email protected] West Wales SMP2: Estuaries Assessment Summary ABP Marine Environmental Research Ltd (ABPmer) was commissioned by Haskoning UK Ltd to undertake the Appendix F assessment component of the West Wales SMP2 which covers the section of coast between St Anns Head and the Great Orme including the Isle of Anglesey. This assessment was undertaken in accordance with Department for Environment, Food and Rural Affairs (Defra) guidelines (Defra, 2006a). Because of the large number of watercourses within the study area a screening exercise was carried out which identified all significant watercourses within the study area and determined whether these should be carried through to the Appendix F assessment. The screening exercise identified that the following watercourses should be subjected to the full Appendix F assessment: . Nyfer Estuary; . Teifi Estuary; . Dyfi Estuary; . Dysynni Estuary; . Mawddach Estuary; . Artro Estuary; . Glaslyn/Dwyryd Estuary; . Cefni Estuary; . Alaw Estuary; . Traeth Dulas; . Menai Strait; and . Conwy Estuary. All other watercourses have been defined as having either virtually no interaction with the open coast or an interaction which is likely to be either small and / or localised in nature. For these watercourses an appropriate limit of coastal process interaction has been suggested based on the available data. The Appendix F assessment for the watercourses listed above found that only Traeth Dulas need not be included within the open coast Shoreline Management Plan (SMP). It was found that the other estuaries need to be included within the SMP and appropriate limits have been determined based on the available evidence. R/3862/1 (i) R1563 West Wales SMP2: Estuaries Assessment West Wales SMP2: Estuaries Assessment Contents Page Summary ..................................................................................................................................................i 1. Introduction.................................................................................................................................1 1.1 Report Aims................................................................................................................................1 1.2 Report Structure .........................................................................................................................2 2. Watercourse Screening (Stage 1) ..............................................................................................3 2.1 Methodology...............................................................................................................................3 2.1.1 Data Review.................................................................................................................3 2.1.2 Boundaries of Other Management Plans .....................................................................3 2.1.3 Screening.....................................................................................................................4 2.2 Results and Conclusions (Stage 1) ............................................................................................5 3. Shoreline Management Plans: Integration of Estuaries..............................................................6 3.1 Overview of Guidance ................................................................................................................6 3.1.1 Open Coast - Estuary Interactions ...............................................................................6 3.1.2 Should the Estuary Be Included in the SMP Process?.................................................6 3.1.3 How Should the Estuary Be Included in the SMP Process? ........................................7 3.1.4 How Far Upstream Should the Estuary Be Included?..................................................7 3.1.5 Estuary Guidance Tables.............................................................................................7 3.2 Tidal Locking Assessment..........................................................................................................8 4. Nyfer Estuary Assessment .........................................................................................................9 4.1 Conceptual Understanding.........................................................................................................9 4.1.1 Response to Sea Level Rise......................................................................................10 4.1.2 Assessment of Tidal Locking......................................................................................10 4.1.3 Summary of Key Processes and Morphology ............................................................10 4.2 Estuaries Assessment..............................................................................................................11 4.3 Discussion................................................................................................................................12 5. Teifi Estuary Assessment .........................................................................................................13 5.1 Conceptual Understanding.......................................................................................................13 5.1.1 Response to Sea Level Rise......................................................................................14 5.1.2 Assessment of Tidal Locking......................................................................................14 5.1.3 Summary of Key Processes and Morphology ............................................................15 5.2 Estuaries Assessment..............................................................................................................16 5.3 Discussion................................................................................................................................17 6. Dyfi Estuary Assessment..........................................................................................................18 6.1 Conceptual Understanding.......................................................................................................18 6.1.1 Response to Sea Level Rise......................................................................................20 6.1.2 Assessment of Tidal Locking......................................................................................20 6.1.3 Summary of Key Processes and Morphology ............................................................20 6.2 Estuaries Assessment..............................................................................................................21 6.3 Discussion................................................................................................................................22 R/3862/1 (ii) R1563 West Wales SMP2: Estuaries Assessment 7. Dysynni Estuary........................................................................................................................23 7.1 Conceptual Understanding.......................................................................................................23 7.1.1 Response to Sea Level Rise......................................................................................24 7.1.2 Assessment of Tidal Locking......................................................................................24 7.1.3 Summary of Key Processes and Morphology ............................................................25 7.2 Estuaries Assessment..............................................................................................................26 7.3 Discussion................................................................................................................................27 8. Mawddach Estuary Assessment...............................................................................................28 8.1 Conceptual Understanding.......................................................................................................28 8.1.1 Response to Sea Level Rise......................................................................................29 8.1.2 Assessment of Tidal Locking......................................................................................29 8.1.3 Summary of Key Processes and Morphology ............................................................30 8.2 Estuaries Assessment..............................................................................................................31 8.3 Discussion................................................................................................................................32 9. Artro Estuary Assessment ........................................................................................................33
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