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Swansea Bay Tidal Lagoon

Specialist Consultants in the Aquatic Environment

SWANSEA BAY TIDAL LAGOON

Recreational & commercial fisheries inputs

Nationally significant infrastructure project (NSIP)

Delivering inputs to PEIR, ES, HRA, WFD and marine licence application.

Representing Tidal Lagoon Power at technical evidence meetings with regulators and stakeholders.

PROJECT OVERVIEW

Background:

The Swansea Bay scheme will be the first tidal lagoon power generation plant in the world, contributing significantly to the UK’s renewable energy generation.

Our involvement:

Tidal Lagoon Power commissioned THA Aquatic to prepare inputs to the Environmental Statement for commercial and recreational fisheries, and to provide technical support to the client team on fisheries matters.
The scope of the Swansea Tidal Lagoon project incorporated a range of routine and specialist activities.
Initial consultations with fishery stakeholders were undertaken and THA Aquatic personnel were integral in representing Tidal Lagoon Power at technical meetings with both the stakeholders and associated regulatory bodies.
Our team also presented scientific evidence at public meetings relating to the project for the purposes of a public inquiry.
THA Aquatic ecologists undertook baseline desk studies of fish and shellfish biology in the South Wales aquatic environment, including spawning & nursery areas, commercial landings and recreational angling sites.
Quarterly baseline fish surveys were conducted in Swansea Bay and the surrounding area using Water Framework Directive (WFD) techniques.
Alongside these studies and surveys on the areas aquatic ecology, we produced scientific insight gained from sophisticated modelling techniques to inform Tidal Lagoon Power on predictive fish behaviour around turbine structures.

“THA Aquatic have provided expert fisheries inputs to Tidal Lagoon Power Ltd since 2012 on the Swansea Bay and Cardiff Tidal Lagoon Environmental Impact Assessments (EIA’s).  For Swansea, they delivered the Environmental Statement chapter for recreational and commercial fisheries for which they undertook all the baseline fish surveys.  The use of their innovative modelling approaches, such as the fish injury model Striker helped in developing the design of the turbines, and testing a range of scenarios during the EIA.  THA Aquatic have supported TLP throughout negotiations with regulators helping to find solutions to key concerns held by stakeholders on fisheries matters.”

Tamsin Watt: Tidal Lagoon Power

For more information on Tidal Lagoon Power.

TURBINE FISH INJURY MODELLING FOR MULTIPLE SPECIES

During the development phase of the scheme, THA Aquatic worked closely with  Tidal Lagoon Power and turbine designers Andritz Hydro to refine the design of the proposed turbines based on fish sensitivity criteria.
Combining Andritz Hydro’s Computational Fluid Dynamics with THA Aquatic’s STRIKER™ modelling technology demonstrated that predicted injury rates for delicate species such as herring and shads could be reduced by a factor of ten or more.
To assess turbine encounter and multiple passage rates THA Aquatic specialists developed an individual based model (IBM) to predict fish species behaviour around the existing turbine structures.

STRIKER™ modelling

To estimate fish mortality resulting from passing through Kaplan and Francis hydroelectric turbines, director of THA Aquatic Dr Andy Turnpenny undertook pioneering laboratory work in the 1990’s which led to the development of a computer based model that became STRIKER™.
STRIKER™ is a valuable tool within Environmental Impact Assessment (EIA) as it can be used to predict likely mortality rates for species of conservational interest.
Fish injury and mortality can result from several mechanisms when passing through turbines. These include, rapid & extreme pressure change, shear stress, turbulence or physical contact with blades or associated fixed structures.
STRIKER™ calculates the probability of a fish being injured due to each of these mechanisms. The latest tidal power STRIKER™v.5 model is capable of calculating mean injury rates across a year for species of interest. It is suitable for a range of turbine operating conditions, offering full stochastic representation of key variables using Monte Carlo methodology.

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