Tidal resource extraction in the Pentland Firth, UK: Potential impacts on flow regime and sediment transport in the Inner Sound of Stroma

Martin‐Short, R.; Hill, Jon; Kramer, Stephan C.; Avdis, Alexandros; Allison, Peter A.; Piggott, Matthew D.

doi:10.1016/j.renene.2014.11.079

Cited by 119 publications

(88 citation statements)

References 46 publications

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“…A variety of methods have been used for the implementation of turbines in coastal array models: in two-dimensional models, the impact of turbines is often included as an additional component of bottom friction within the array footprint, either averaged over the whole array or as individual turbines [33,34,42]. The value used is often based on actuator disk theory with correction factors applied when array scale extraction is considered [43,44].…”

Section: Coastal Area Modellingmentioning

confidence: 99%

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

et al. 2015

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To fully understand the performance of tidal stream turbines for the development of ocean renewable energy, a range of computational models is required. We review and compare results from several models of horizontal axis turbines at different spatial scales. Models under review include blade element momentum theory (BEMT), blade element actuator disk, Reynolds averaged Navier Stokes (RANS) CFD (BEM-CFD), blade-resolved moving reference frame and coastal models based on the shallow water equations. To evaluate the BEMT, a comparison is made to experiments with three different rotors. We demonstrate that, apart from the near-field wake, there are similarities in the results between the BEM-CFD approach and a coastal area model using a simplified turbine fence at a headland case.

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Section: Coastal Area Modellingmentioning

confidence: 99%

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

et al. 2015

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“…The use of geophysical fluid dynamics simulations in the context of environmental impact assessment [2,3,4,5,17,26] and coastal infrastructure optimisation [31] is becoming common place. Robust mesh generation is therefore required, enabling an adequate representation of coastal infrastructure, within inherently complex geophysical domains.…”

Section: Discussionmentioning

confidence: 99%

“…For example, the parameterisation of geo- metrically complex turbines has been common practice in studying the impact of tidal power generation arrays on sedimentation patterns [5]. However, recent studies have an increasingly detailed geometric description of the tidal turbines [33], as the focus shifts on tidal device per-formance, loading, survivability, interaction between devices, and tidal array optimisation in realistic domains.…”

Section: Discussionmentioning

confidence: 99%

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Meshing Ocean Domains for Coastal Engineering Applications

Avdis¹,

Jacobs²,

Mouradian³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. As we continue to exploit and alter the coastal environment, the quantification of the potential impacts from planned coastal engineering projects, as well as the minimisation of any detrimental effects through design optimisation, are receiving increasing attention. Geophysical fluid dynamics simulations can provide valuable insight towards the mitigation and prevention of negative outcomes, and as such are routinely used for planning, operational and regulatory reasons. The ability to readily create high-quality computational meshes is critical to such modelling studies as it impacts on the accuracy, efficiency and reproducibility of the numerical results. To that end, most (coastal) ocean modelling packages offer tailored mesh generation utilities. Geographical Information Systems (GIS) offer an ideal framework within which to process data for use in the meshing of coastal regions. GIS have been designed specifically for the processing and analysis of geophysical data and are a popular tool in both the academic and industrial sectors. On the other hand Computer Aided Design (CAD) is the most appropriate tool for designing coastal structures and is usually the user interface to generic three-dimensional mesh generation frameworks. In this paper we combine GIS and CAD with a view towards mesh generation for an impact study of the proposed Swansea Bay Tidal Lagoon project within the Bristol Channel and Severn Estuary. We demonstrate in this work that GIS and CAD can be used in a complementary way to deliver unstructured mesh generation capabilities for coastal engineering applications.

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“…In a subsequent study, Neill et al [7] found that tidal turbines could also impact sand bank formation and evolution near headlands. In the Pentland Firth, Martin-Short et al [8] used a high resolution hydrodynamic model to identify areas of sediment erosion and deposition, based on critical bed shear stress distributions calculated by the model. They found that installing arrays of more than 85 tidal turbines in the Inner Sound had the potential to significantly displace areas of sediment accumulation from the sides of the channel towards the centre, as the flow was diverted around the array.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

Gillibrand

Walters²,

McIlvenny

2016

Energies

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Abstract:We apply a three-dimensional hydrodynamic model to consider the potential effects of energy extraction by an array of tidal turbines on the ambient near-bed velocity field and local bed shear stress in a coastal channel with strong tidal currents. Local bed shear stress plays a key role in local sediment dynamics. The model solves the Reynold-averaged Navier-Stokes (RANS) equations on an unstructured mesh using mixed finite element and finite volume techniques. Tidal turbines are represented through an additional form drag in the momentum balance equation, with the thrust imparted and power generated by the turbines being velocity dependent with appropriate cut-in and cut-out velocities. Arrays of 1, 4 and 57 tidal turbines, each of 1.5 MW capacity, were simulated. Effects due to a single turbine and an array of four turbines were negligible. The main effect of the array of 57 turbines was to cause a shift in position of the jet through the tidal channel, as the flow was diverted around the tidal array. The net effect of this shift was to increase near-bed velocities and bed shear stress along the northern perimeter of the array by up to 0.8 m·s −1 and 5 Pa respectively. Within the array and directly downstream, near-bed velocities and bed shear stress were reduced by similar amounts. Changes of this magnitude have the potential to modify the known sand and shell banks in the region. Continued monitoring of the sediment distributions in the region will provide a valuable dataset on the impacts of tidal energy extraction on local sediment dynamics. Finally, the mean power generated per turbine is shown to decrease as the turbine array increased in size.

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Tidal resource extraction in the Pentland Firth, UK: Potential impacts on flow regime and sediment transport in the Inner Sound of Stroma

Cited by 119 publications

References 46 publications

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

Meshing Ocean Domains for Coastal Engineering Applications

Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

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