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Sizewell C Coastal Event 22nd January 2019, 1300-1600 High Lodge, Darsham.
Stage 3 Pre-Application Consultation Sizewell C Coastal Event 22nd - - PowerPoint PPT Presentation
Stage 3 Pre-Application Consultation Sizewell C Coastal Event 22nd - - PowerPoint PPT Presentation
Sizewell C Stage 3 Pre-Application Consultation Sizewell C Coastal Event 22nd January 2019, 1300-1600 High Lodge, Darsham. Presentation Summary Focus of presentation is on coastal process issues. Recap current SMP policy. Review
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SMP recognises changing coast
N Minsmere Sluice Sizewell B Outfall active embayment
Sizewell C
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Dunwich Cliffs to Thorpeness (SMP 7; Jan 2010) Sizewell A & B Minsmere Sluice Thorpeness Minsmere embayment
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SMP policy Summary
Sizewell
MR MR
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Preferred Policy to Implement Plan (SMP 7)
Present day Maintain Minsmere Sluice and develop managed realignment to the north end of Minsmere. Medium Term Adapt but maintain the sluice and manage realignment to the north end of Minsmere. Consider improving flood defence within the Minsmere Valley. Long Term Adapt but maintain the Minsmere Sluice (subject to this not impinging on sediment movement and manage realignment to the north end of Minsmere. Potential need to reinforce defence at Sizewell Power Station.
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Review of Stage 2 Concerns
- How EDF has responded to the consultation stage 2
concerns of SCC and SCDC is in the Handout sent by email on 18/1.
- The SCDC provisional updated position taking
account of new EDF information is shown.
- The focus by SCDC to date is on Coastal process
issues.
- SCDC will comment on other matters in due course.
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Stage 3; Primary Concerns (CPA)
1: Impacts on nearshore coastal processes of Beach Landing Facility (BLF) and Fish Recovery Return (FRR) / Combined Drainage Outfalls (CDO). 2: Impacts of hard defence exposure on alongshore sediment transport. 3: Risk posed by incomplete design and seaward position of hard coastal defences.
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1: Impacts on nearshore coastal processes
- f Beach Landing Facility (BLF) and
Fish Recovery Return (FRR) /Combined Drainage Outfalls (CDO)
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1.1 Impact of BLF
Outer sand bar Barge Potential Rock platform.
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1.2 Example BLF
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1.3 Impact of nearshore outfalls
Figure 2.16.1 Proposed marine infrastructure
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1.4 Station B salient
B Station outfall `salient’
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2: Impacts of hard defence exposure on alongshore sediment transport
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2.1 Proximity of defences to shoreline
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2.2 Profile of defences
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Green – indicative existing coast line. Not to Scale. Red – SCDC estimated / indicative future shoreline with Sluice intact.
(Detailed forecast shoreline assessment by EDF not yet available). Net sediment flow is N-S but large variations S-N are possible.
Minsmere Sluice A B C
2.3 Potential shoreline change
Fuel store is at back edge of C station site.
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Development of a Monitoring and Mitigation plan that: ✓Requires comprehensive data gathering. ✓Includes robust and objective analysis. ✓Has clear triggers for action. ✓Is flexible to accommodate future surprises ✓Is required to protect the interests of all parties.
2.4 Monitoring and Mitigation
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3: Risk posed by Incomplete design and seaward position
- f hard coastal defences.
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Mean Sea Level
Potential change to hard defence toe detail to add resilience to future coastal change.
3.1 Need for extension of defence toe
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3.2 EDF indicative coastal defences
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3.4 EDF before / after images
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Approximate Seaward position of current EDF defence toe at BLF
3.5 Position of rock toe at BLF
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3.6 Proximity of rock toe to beach
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