Lancaster University
Renewable Energy Group
The Tidal Barrage Option for
the Wyre Estuary
Student: Kingsley Adinnu
James Anderson
Ben Onley
Andrew Blain
Chris North
Supervisor: Dr George A Aggidis
Date: 03 February 2011
Lancaster University
Renewable Energy Group
Introduction
Prospective locations
How Tides work
Artists impression of the finished barrage
2
Lancaster University
Renewable Energy Group
Aims and Objectives
• Identify design requirements and limitations.
• Evaluate the potential locations for the tidal
barrage.
• Analyse the operational mode of the tidal
barrage.
• Possible turbine specification/selection.
• Consideration of maintenance and longevity.
3
Lancaster University
Renewable Energy Group
Design Requirements
& Limitations I
Environs
•
Knott End
•
Fleetwood
•
Wyre Estuary
•
Irish Sea
Primary Requirements
• Tidal Power Generation
• Flood Defences
4
Lancaster University
Renewable Energy Group
Design Requirements
& Limitations II
Limitations
•
Caisson Construction
•
Salt Resistance Imperative.
•
Small generating window.
•
Remote operation.
•
Difficult to retrofit primary barrage
structure (i.e. navigable locks
must be decided upon prior to
commencing construction).
•
Periodic dredging required
throughout lifespan of barrage.
£
5
Lancaster University
Renewable Energy Group
Design Requirements
& Limitations III
Additional Functions & Facilities;
•
Visitors Centre.
•
Wyre Marina/saltwater lake.
•
Provision for foot/road bridge as
part of barrage.
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Lancaster University
Renewable Energy Group
The Wyre Estuary
Locations
Closer to river mouth- more power.
If downstream of docks then a lock will be required.
Three potential locations with a new fourth;
North- Most power, blocks Fleetwood docks from
sea but allows large area for pleasure craft, no
bridge so as not to disturb Knott End village.
Central- Less power, Doesn’t block docks. Bisects
Knott End golf links.
South- Least power, smallest area for pleasure craft,
may disrupt wildlife.
New Alternative North- More power than original
north location, larger area for pleasure craft, still
blocks Fleetwood docks from sea access. Though
a suitable lock can be included in the tidal
barrage.
7
Lancaster University
Renewable Energy Group
Tidal Barrage Operation I
• How a tidal Barrage works
• Different Generation
Modes System of a Tidal
Barrage
• Suitability of the Two –
way Generation and Ebb
Generation + Flood
pumping for the wyre
Area
8
Lancaster University
Renewable Energy Group
Tidal Barrage Operation II
• Components for
successful operation of
the Tidal barrage
• Grid Connection for the
Wyre area – On & Off
grid connection
Locks
Embankment Turbine
Sluice gate
9
Lancaster University
Renewable Energy Group
Wyre 3D Model
• Using
Information
referenced from
the Digi-Maps
• 3D Model
• Using CAD
software to
determine the
Volume of water
across the
proposed barrage
from the depth of
tides.
10
Lancaster University
Renewable Energy Group
Power Calculation, Turbine
Selection/Specification I
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Prandle, D. Simple theory for designing tidal power schemes, Adv. Water Resources, 1984, Volume 7, March
Lancaster University
Renewable Energy Group
Power Calculation, Turbine
Selection/Specification II
12
Lancaster University
Renewable Energy Group
Power Calculation, Turbine
Selection/Specification III
Gross Head = 3.5m
Net Head = 3.26m
Maximum Efficiency = 94.29
Rated Power = 21.6 MW
Diameter = 6.5m
Speed = 71.43rpm
Number of Turbines = 6
13
Lancaster University
Renewable Energy Group
Maintenance and Longevity
of the Tidal Barrage I
• Maintenance of functioning structures,
such as concrete caissons.
• Maintenance of non-functional
structures such as access roads,
embankments and possible tourist
facilities.
• Maintenance, repair and replacement of
electrical and mechanical equipment.
• Maintenance of river bed on either side
of the barrage.
14
Lancaster University
Renewable Energy Group
Maintenance and Longevity
of the Tidal Barrage II
• Today's reinforced concrete will stand
functioning for 120 years.
• Coat steel rebar in an epoxy coating.
• Using the nano-particle additive developed by
NIST researchers slows down the penetration of
chlorides and sulfates.
• Overhaul all electrical and mechanical
components every 30 years.
15
Lancaster University
Renewable Energy Group
Future Developments
of the Tidal Barrage
• Physical dimensions of the barrage planned to
possibly accommodate a road to connect
Fleetwood to Knott End-on Sea in the future.
• Chances to place barrages on the River Mersey,
Morecambe Bay, and the Solway Firth.
• These combined have the potential to generate
16500GWh/year
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Lancaster University
Renewable Energy Group
Conclusions & Next Steps
• The most cost effective construction technique for the Wyre
Tidal barrage, in order to fulfil the design requirements, are
pre-fabricated caissons.
• The Northern Location is the most suitable for the
construction of the tidal barrage.
• The Two- way generation + Flood Pumping Mode has been
designated as the best operating mode for Wyre tidal
Barrage.
• The Wyre 3D can be further developed for control and
accurate calculation of the barrage operation in relation to
the tides.
Lancaster University
Renewable Energy Group
The Tidal Barrage Option for
the Wyre Estuary
Thank You
Any Questions?
Student: Kingsley Adinnu
James Anderson
Ben Onley
Andrew Blain
Chris North
Supervisor: Dr George A Aggidis