barrage or what?
DESCRIPTION
Barrage or What?. Engineering Options. Prof Colin Taylor CEng FICE Professor of Earthquake Engineering Head, Department of Civil Engineering [email protected]. The technical options. Barrage Lagoon Tidal reef Tidal fence Tidal stream. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/1.jpg)
Barrage or What?Engineering Options
Prof Colin Taylor CEng FICEProfessor of Earthquake EngineeringHead, Department of Civil Engineering
![Page 2: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/2.jpg)
The technical options
• Barrage• Lagoon• Tidal reef• Tidal fence• Tidal stream
Source: Marc Paish, Severn Tidal Fence Group
![Page 3: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/3.jpg)
Barrage
![Page 4: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/4.jpg)
Barrage turbine
Source: Roger Falconer
![Page 5: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/5.jpg)
Tidal lagoon
Source: University of Colorado
![Page 6: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/6.jpg)
Fleming lagoon flow computation
Filling Discharging
2 2.5 3 3.5 4 4.5 5 5.5 6
2 m/s
Water level (m)
Flood
Frame 001 01 Sep 2008 Hydrodynamic Results in Nodes
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
2 m/s
Water level (m)
Ebb
Frame 001 01 Sep 2008 Hydrodynamic Results in Nodes
Source: Roger Falconer
![Page 7: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/7.jpg)
Evans tidal reef
Source: Evans Engineering
![Page 8: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/8.jpg)
Evans tidal reef
![Page 9: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/9.jpg)
Low-head turbine for reef
Source: Rod Rainey, Atkins
![Page 10: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/10.jpg)
Tidal fence
Source: Marc Paish, Severn Tidal Fence Group
![Page 11: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/11.jpg)
Tidal stream
Source: DeltaStream Turbines
Source: Swanturbines
![Page 12: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/12.jpg)
Short listed options
![Page 13: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/13.jpg)
Severn Tidal Fence Group
![Page 14: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/14.jpg)
Barrage issues
• Significant environmental impacts
• Reduction of water levels and tidal range
• Loss of inter-tidal habitats • Impacts on bird and fish
populations in the Severn• Inhibits port traffic • Protection from effects of
storm surges, sea level rise• Reduced turbidity• Established technology
La Rance, France
![Page 15: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/15.jpg)
Lagoon issues
• Significant reduction in tidal range within the impounded area
• Loss of inter-tidal habitats• Other environmental effects
are similar to smaller barrages • Less impacts on fish and
navigation as not a full a barrier across the estuary
• Enclosure construction uncertain (e.g. embankment, caissons, innovative modular concrete/earth units?)
• Longer than barrage
![Page 16: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/16.jpg)
Reef issues
• Unproven technology• Long development
period• Less loss of tidal
range• Lower efficiency?• Inhibits shipping
Source: Evans Engineering
![Page 17: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/17.jpg)
Fence issues
• Unproven technology• Long development period• Less loss of tidal range• Lower efficiency?• Less impact on shipping
(but vulnerable to ship impact?)
Source: Marc Paish, Severn Tidal Fence Group
![Page 18: Barrage or What?](https://reader035.vdocuments.site/reader035/viewer/2022081800/56814f51550346895dbcf785/html5/thumbnails/18.jpg)
Cost comparisons
Source DECC Analysis of Options report