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NEECA2 TOOLBOX TALK. Coastal Engineering Alex Schofield. 1. Slide No. Contents. The Felixstowe Project(s) Coastal Processes Feasibility Study and PAR Detailed Design Construction B&V Maritime and Coastal Team. 2. Slide No. Felixstowe Projects. Started in early 2004

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neeca2 toolbox talk

NEECA2 TOOLBOX TALK

Coastal Engineering

Alex Schofield

1

Slide No.

contents
Contents
  • The Felixstowe Project(s)
  • Coastal Processes
  • Feasibility Study and PAR
  • Detailed Design
  • Construction
  • B&V Maritime and Coastal Team

2

Slide No.

B&V - 2

felixstowe projects
Felixstowe Projects
  • Started in early 2004
    • Coastal Processes Study
    • Feasibility Study and PAR (PAR submitted Nov 2005)
    • Detailed Design (contract docs issued May 2006)
    • Strategy Review and Update (StAR submitted Aug 2007)
    • PAR update (PAR submitted September 2007)
    • Detailed Design review (contract docs issued Nov 2007)
    • Construction (commenced March 2008)

3

Slide No.

B&V - 3

introduction to felixstowe study area
Introduction to Felixstowe – study area

Port of

Felixstowe

960 residential &

468 commercial properties

War Memorial to Landguard Common

Landguard

Fort SM

Landguard

Common SSSI

5

Slide No.

B&V - 5

introduction to felixstowe study frontage
Introduction to Felixstowe – Study Frontage

Suffolk Coastal District Council

(Coastal Protection Act)

Environment Agency

(Land Drainage Act)

6

Slide No.

B&V - 6

coastal processes wave and water level conditions
Coastal Processes – Wave and Water Level Conditions
  • Collected Wave and Water level data
    • Wave and water level extremes
    • Wave roses
    • Joint probability

9

Slide No.

B&V - 9

coastal processes sediment transport
Coastal Processes – Sediment Transport
  • Beach sampling
  • Equilibrium bay shape development
  • Potential sediment transport
  • Analysis of beach profile information

11

Slide No.

B&V - 11

coastal processes modelling
Coastal Processes – Modelling
  • Longshore sediment movement
  • Cross shore sediment movement

12

Slide No.

B&V - 12

coastal processes modelling1
Coastal Processes – Modelling
  • Alongshore sediment transport
  • Cross-shore sediment movement
  • Tidal currents

Inshore eddy

Ebb

Flood

Net movement South

Net movement North

Strong cross-shore movements

13

Slide No.

B&V - 13

feasibility study options process

Review

Data Collection and Analysis

Consultation & liaison (internal and external)

Identify Options

Technical, Economic and Environmental Appraisal

Identify Preferred Option

Feasibility Study – Options Process

14

Slide No.

B&V - 14

feasibility study options
Feasibility Study – Options
  • Beach recharge required to protect front line defences
  • Shoreline control structures required to hold the beach in place. Options considered:
    • Timber groynes (30m long @ 30m spacing)
    • Straight rock groynes (50m long @ 100m spacing)
    • Rock fishtail (‘T’ head) groynes (40m long with 20m ‘T’ @ 110m spacing)
  • Open beach, rock revetment, offshore reefs and large fishtail structures ruled out early on.

15

Slide No.

B&V - 15

feasibility study technical appraisal

Original

shoreline

Local

accretion

Local

erosion

Original

shoreline

Stable bay

Feasibility Study – Technical Appraisal
  • Straight groynes
  • Fishtail groynes

16

Slide No.

B&V - 16

feasibility study economic appraisal
Feasibility Study – Economic Appraisal
  • Option capital costs costed by Team Van Oord
  • Strategic Business case, including risk to life damages
  • High economic justification (BCR = 29, PS = 27)
  • Economically preferred option = Rock fishtail groynes

17

Slide No.

B&V - 17

feasibility study consultation environmental issues
Feasibility Study – Consultation / Environmental Issues
  • SSSI (vegetated shingle) – no change to coastal processes
  • Change in landscape – impact on amenity and tourism

18

Slide No.

B&V - 18

feasibility study par
Feasibility Study – PAR
  • Project Appraisal Report (PAR) presented to EA’s National Review Group in September 2007
    • Approval sum of £12.4 million
  • Recommended for approval by NRG in November 2007, with Director of Operations approval February 2008 (following approval of strategy)

19

Slide No.

B&V - 19

detailed design rock groynes
Detailed design – Rock Groynes
  • 3 – 6t armourstone
  • Bedstone below low water and geotextile above

21

Slide No.

B&V - 21

detailed design beach recharge
Detailed design – Beach Recharge
  • Design beach profile to bring beach levels close to promenade, with 10m berm and slope 1 in 7
  • 250,000m3 beach recharge
  • Grading required to match existing beach material, so screening required
  • Pump distance 2.1km due to bathymetry of nearshore area
  • Beach recharge ahead of groyne construction to improve buildability

22

Slide No.

B&V - 22

construction
Construction
  • Contract awarded Feb 2008
    • Construction value £10.5m
  • Mobillisation commenced 1st March
    • Original programme completion mid August
    • Revised programme end of September
  • Construction team:
    • Contractor: Team Van Oord
    • Designer and Site Supervision: B&V
    • ECC PM: Haskoning

23

Slide No.

B&V - 23

construction1
Construction

29

Slide No.

B&V - 29

construction so far
Construction – So far…
  • Beach recharge complete
  • Completed approx half of the rock works
  • Issues encountered:
    • Delayed beach recharge
    • Bomb…
    • Contractor’s cost overrun
    • Form G required
  • B&V praised for our

performance

30

Slide No.

B&V - 30

maritime and coastal team
Maritime and Coastal Team
  • Redhill:
    • Norman Cox – Maritime Engineer
    • David Keiller – Tidal and estuary dynamics
    • Alex Schofield – Coastal engineering (strategy to contruction)
    • Peter La Roche – Coastal modelling
    • Lisa Hardwick, Dan Glasson, Leah Barker – Coastal engineering and site supervision
    • Juliette Horsford – Oceanography
  • Plymouth:
    • Paul Westaway – Maritime structures
    • Andrea Northey – Coastal / maritime engineering
  • Chester:
    • Andy Jones, David Barton, Alex Devine – Coastal / maritime engineering
  • Sub consultant:
    • Noel Beech – Coastal processes specialist (formerly of Haskoning)

31

Slide No.

B&V - 31