Assessing impacts of tidal power lagoons of a consistent design

Mackie, Lucas; Kramer, Stephan C.; Piggott, Matthew D.; Angeloudis, Athanasios

doi:10.1016/j.oceaneng.2021.109879

Cited by 12 publications

(20 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thetis has been applied for several marine energy assessment and optimisation methods (e.g. Angeloudis et al, 2018Angeloudis et al, , 2020Mackie et al, 2021b;Goss et al, 2021). Here we consider its solver for the non-conservative form of the 2-D, depthaveraged nonlinear shallow water equations…”

Section: Shallow-water Equation Modelling and Turbine Parameterisatio...mentioning

confidence: 99%

Tidal array spatial optimisation combining Shallow Water Equation and wake superposition modelling

Jordan¹,

Dundovic²,

Fragkou³

et al. 2022

Proceedings of the 39th IAHR World Congress

View full text Add to dashboard Cite

Tidal array optimisation is a multifaceted problem that aims at the improvement of an array design's performance, including its overall power yield. Benefits include reductions in investment uncertainty, thus supporting the tidal stream energy industry to reach its potential. Considering the complex, high-energy tidal hydrodynamics at proposed sites, defining an optimal array layout is challenging and remains an active research area. Existing optimisation methodologies can be either computationally untenable or restrictively simplified for practical cases. We present an optimisation approach that combines an analytical-based wake model, FLORIS, with a coastal ocean hydrodynamics model, Thetis. The approach is first demonstrated through idealised steady and transient flow cases to highlight hydrodynamics structures that are overlooked, including spatial complexity, tidal asymmetry, and the practical exploitation of blockage effects.. We thus explore the use of analytical wake superposition in combination with the use of simple heuristic techniques to achieve turbine array optimisation at a fraction of the computational cost of alternative methods. Towards this objective, we designed a custom condition-based placement algorithm. The algorithm is applied to the Pentland Firth, including a case of 24 turbines that follow a power curve constrained by a rated speed of ~3.0 m/s. This case study serves to demonstrate device-specific implications whilst also considering the temporal variability of the tide. Overall, this turbine layout optimisation process is able to deliver an array design that is 12% more productive on average than a staggered layout. Performance was quantified through assessment of the optimised layout using a shallow water equation model which more correctly represents turbines through discrete momentum sink terms.

show abstract

Section: Shallow-water Equation Modelling and Turbine Parameterisatio...mentioning

confidence: 99%

Tidal array spatial optimisation combining Shallow Water Equation and wake superposition modelling

Jordan¹,

Dundovic²,

Fragkou³

et al. 2022

Proceedings of the 39th IAHR World Congress

View full text Add to dashboard Cite

show abstract

“…Despite obstacles faced by technology proponents on economic feasibility, research on the subject is scarce compared to other aspects such as environmental impact assessment [18,19] and operation performance optimisation [20,21]. The economic viability of renewable energy schemes typically concentrates on the quantification of levelised cost of energy (LCOE).…”

Section: Introductionmentioning

confidence: 99%

“…We seek to inform this design challenge in a manner that includes the geospatial sensitivity of different studies to costs, while demonstrating an approach to establish a robust comparative basis to assess different tidal range structures. In this process, we include steps to acknowledge tidal power plant hydrodynamic impacts [19] and embed an operational performance optimisation step [20]. This recognises how these steps have been oversimplified or excluded in economic analyses to-date which could introduce a tangible level of uncertainty.…”

Section: Introductionmentioning

confidence: 99%

On the economic feasibility of tidal range power plants

Pappas,

Chien,

Zilakos

et al. 2023

Preprint

View full text Add to dashboard Cite

The wave potential energy associated with tides presents a promising sustainable energy resource. Uncertainties on the economic case of tidal range power plants are a known bottleneck hindering the development of the industry. Significant costs depend on each design's general arrangement, which includes both mechanical components and the associated civil works. Research on tidal range structures suggests yield may be maximised through operation strategy optimisation. While highlighting the untapped potential, such optimisation alone is insufficient to support the feasibility of prospective projects. We combine operation optimisation and hydrodynamic impact analyses within a cost evaluation framework for tidal range structures focusing on capital costs and levelised cost of energy. We apply this consistently and widely across idealised and historic proposals and then proceed to perform a re-design of tidal range power plants to deliver a consistent comparative basis. The operation of tidal range plants is represented in regional coastal ocean models, acknowledging tide variability based on shallow water equation modelling. A modelling case study encompassing the UK's West coast extending to the continental shelf serves to benchmark tidal range schemes of different designs and scales. The cost evaluation framework is compared against reported cost projections and is the first to consider the geospatial variations of multiple options consistently.

show abstract

“…However, this approach focuses on the aggregate energy output and does not provide insight into how representative the tidal signal spring-neap elevation could be relative to the long-term trends. More recently, Mackie et al (2021) made use of representative tidal level definitions from the National Tidal and Sea Level Facility (e.g. Mean high/low water springs/neaps) across several locations around the UK to identify an appropriate interval to assess multiple tidal range designs at various locations.…”

Section: Introductionmentioning

confidence: 99%

“…We thus formulate the problem as the robust definition and identification of a representative tidal signal spanning a lunar-monthly period in terms of its tidal range and potential energy magnitude and variation relative to a nodal tidal cycle of 18.6134 years (Kowalik and Luick 2019). Practi-cally, this question is driven by a motivation to fairly compare schemes that are subjected to varying tidal conditions, considering the multiple inconsistencies that need to be balanced in the assessment of tidal range structures, as in Mackie et al (2021).…”

Section: Introductionmentioning

confidence: 99%