Meshing Ocean Domains for Coastal Engineering Applications

Avdis, Alexandros; Jacobs, Christian T.; Mouradian, Simon L.; Piggott,

doi:10.7712/100016.1830.7712

Cited by 13 publications

(10 citation statements)

References 17 publications

(21 reference statements)

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“…The mesh generation approach described by Avdis et al [37,38] was followed to produce the multi-scale unstructured triangular meshes to discretise the study domain. Two meshes with the same resolution characteristics have been generated in order to consider the tidal hydrodynamics with and without the tidal lagoons present.…”

Section: Tidal Energy Case Studies and Hydrodynamic Simulationsmentioning

confidence: 99%

Optimising tidal range power plant operation

Angeloudis¹,

Kramer²,

Avdis³

et al. 2017

Preprint

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• We describe numerical methods to simulate the operation of tidal range power plants.• We couple simplified power plant operation models with gradient-based optimisation algorithms.• The consideration of a flexible operation with pumping is shown to have the potential to deliver significant energy gains.• Optimisation of larger plant designs should be coupled with hydrodynamics solvers. A R T I C L E I N F OKeywords: Tidal range energy Tidal lagoon Marine energy Resource assessment Control optimisation Gradient-based optimisation A B S T R A C T Tidal range power plants represent an attractive approach for the large-scale generation of electricity from the marine environment. Even though the tides and by extension the available energy resource are predictable, they are also variable in time. This variability poses a challenge regarding the optimal transient control of power plants. We consider simulation methods which include the main modes of operation of tidal power plants, along with algorithms to regulate the timing of these. This paper proposes a framework where simplified power plant operation models are coupled with gradient-based optimisation techniques to determine the optimal control strategy over multiple tidal cycles. The optimisation results inform coastal ocean simulations that include tidal power plants to gauge whether the benefits of an adaptive operation are preserved once their hydrodynamic impacts are also taken into consideration. The combined operation of two prospective tidal lagoon projects within the Bristol Channel and the Severn Estuary is used as an example to demonstrate the potential benefits of an energy maximisation optimisation approach. For the case studies considered, the inclusion of pumping and an adaptive operation is shown to deliver an overall increase in energy output of 20-40% compared to a conventional two-way uniform operation. The findings also demonstrate that smaller schemes stand to gain more from operational optimisation compared to designs of a larger scale.

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Section: Tidal Energy Case Studies and Hydrodynamic Simulationsmentioning

confidence: 99%

Optimising tidal range power plant operation

Angeloudis¹,

Kramer²,

Avdis³

et al. 2017

Preprint

Self Cite

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“…The mesh for the model was set up using “qmesh”, a Python package for constructing flexible unstructured meshes for geophysical models (Avdis et al., 2016; Avdis et al., 2018). The use of unstructured meshes offers significant advantages in representing small spatial features across large geographical extents due to their flexibility of resolution and geometry.…”

Section: Tidal Modellingmentioning

confidence: 99%

An Improved Gridded Bathymetric Data Set and Tidal Model for the Maldives Archipelago

Rasheed

Warder

Plancherel

et al. 2021

Earth and Space Science

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The Maldives is an archipelago located on the Chagos-Laccadives ridge, a prominent feature of the mid Indian Ocean basin, which runs from 9°S to 14°N of the equator. The Maldives archipelago runs from 0°41′48"S 7°06′30"N, occupying the central and largest part of the ridge (Fürstenau et al., 2010). The central location of the Maldives in the Indian ocean, equidistant from the East African and South East Asian reefs, gives rise to a high diversity of ecological species in the archipelago, with high affinities to both regions, within the larger "Chagos stricture" (Kench, 2011). The Maldives is widely recognized as a marine ecological hotspot, part of the world's most extensive atoll formation and the seventh largest reef system in the world, containing over 5% of the world's coral reefs and supporting over 1000 fish, 300 coral and 350 crustacean species (Emerton et al., 2009). Available sources indicate that little has been done to study the bathymetry of the country over large geographic scales since the development of Admiralty charts over a century ago (Kench, 2011). The first largescale bathymetric survey of the Maldives was carried out by Commander James Moresby from 1835 -1883(Gardiner, 1902. These charts still form the underling data for navigational charts of the Maldives. Several subsequent expeditions in the early 20th century by J.

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“…The mesh for the model was set up using 'qmesh', a Python package for constructing flexible unstructured meshes for geophysical models (Avdis et al, 2016(Avdis et al, , 2018 which utilises the 'Gmsh' mesh generator (Geuzaine and Remacle, 2009). The use of unstructured meshes offers significant advantages in representing small spatial features across large geographical extents due to their flexibility over resolution and geometry (Piggott et al, 2008).…”

Section: Unstructured Mesh Generationmentioning

confidence: 99%

Response of tidal flow regime and sediment transport in North Male' Atoll, Maldives to coastal modification and sea level rise

Rasheed¹,

Warder²,

Plancherel³

et al. 2020

Preprint

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Abstract. Changes to coastlines and bathymetry alter tidal dynamics and associated sediment transport process, impacting upon a number of threats facing coastal regions, including flood risk and erosion. Especially vulnerable are coral atolls such as those that make up the Maldives archipelago which has undergone significant land reclamation in recent years and decades, and is also particularly exposed to sea level rise. Here we develop a tidal model of Male' Atoll, Maldives, and use it to assess potential changes to sediment grain size distributions under sea level rise and coastline alteration scenarios. The results indicate that the impact of coastline modification over the last two decades at the island scale is not limited to the immediate vicinity of the modified island, but can also significantly impact the sediment grain size distribution across the wider atoll basin. Additionally, the degree of change in sediment distribution which can be associated with sea level rise that is projected to occur over relatively long time periods is predicted to occur over far shorter time periods with coastline changes, highlighting the need to better understand, predict and mitigate the impact of land reclamation and other coastal modifications before conducting such activities.

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Meshing Ocean Domains for Coastal Engineering Applications

Cited by 13 publications

References 17 publications

Optimising tidal range power plant operation

Optimising tidal range power plant operation

An Improved Gridded Bathymetric Data Set and Tidal Model for the Maldives Archipelago

Response of tidal flow regime and sediment transport in North Male' Atoll, Maldives to coastal modification and sea level rise

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