Barrage or What? Engineering Options Prof Colin Taylor CEng FICE Professor of Earthquake Engineering Head, Department of Civil Engineering

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Presentation transcript:

Barrage or What? Engineering Options Prof Colin Taylor CEng FICE Professor of Earthquake Engineering Head, Department of Civil Engineering

The technical options Barrage Lagoon Tidal reef Tidal fence Tidal stream Source: Marc Paish, Severn Tidal Fence Group

Barrage

Barrage turbine Source: Roger Falconer

Tidal lagoon Source: University of Colorado

Fleming lagoon flow computation Filling Discharging Source: Roger Falconer

Evans tidal reef Source: Evans Engineering

Evans tidal reef

Low-head turbine for reef Source: Rod Rainey, Atkins

Tidal fence Source: Marc Paish, Severn Tidal Fence Group

Tidal stream Source: DeltaStream Turbines Source: Swanturbines

Short listed options

Severn Tidal Fence Group

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

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

Reef issues Unproven technology Long development period Less loss of tidal range Lower efficiency? Inhibits shipping Source: Evans Engineering

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

Cost comparisons Source DECC Analysis of Options report