Numerical modeling of the effect of tidal stream turbines on the hydrodynamics and the sediment transport – Application to the Alderney Race (Raz Blanchard), France

Thiebot, Jérôme; Bois, Pascal Bailly du; Guillou, Sylvain

doi:10.1016/j.renene.2014.10.021

Cited by 112 publications

(87 citation statements)

References 26 publications

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“…This corresponds to a series of fives configurations of 10, 50, 100, 150 and 207 devices. A number of 207 turbines is obtained, by adopting the configuration proposed by Thiébot et al [11], with a density of 50 machines per km 2 applied over the area identified for the implementation of tidal stream arrays in the Fromveur Strait (Fig. 1).…”

Section: Numerical Modellingmentioning

confidence: 99%

“…Nevertheless, whereas numerous numerical studies have exhibited the hydrodynamic effects induced by tidal stream power extraction [6,7,8,9,10], the long-term influence on water-mass transport has been routinely ignored in sites characterisation. Transport studies in potential tidal stream sites have furthermore primarily focused on the impacts of energy extraction on suspended sediment fluxes [11,12], setting aside in-depth investigations of modifications of local tide-induced pathways. A preliminary numerical analysis of passive tracer pathways in a tidal stream energy site was conducted by Shapiro [13], considering a hypothetical array of turbines in the Celtic Sea, north of Cornwall (United-Kingdom).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the impact of tidal stream energy extraction on the Lagrangian circulation

Guillou

Chapalain

2017

Applied Energy

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Whereas numerous numerical modelling have been conducted to gain further insights about the hydrodynamic characteristics of tidal stream energy sites, the long-term transport of water particles has been routinely ignored. However, a refined evaluation of circulation pathways is fundamental to assess water-quality changes induced by tidal energy converters. The present study investigates the tide-induced Lagrangian circulation in north-western coastal waters of Brittany (France, western Europe), including numerous islands, shoals and straits with strong potential for turbine farm implementation. Particular attention is dedicated to the hydrodynamic impact of tidal stream power extraction from a series of horizontal-axis turbines. An original approach, based on the coupling of the Lagrangian barycentric method with predictions from a model with high spatial resolution, is considered to assess circulation pathways in a single synoptic view. Spatial results reveal a complex Lagrangian circulation highly controlled by bathymetry and islands geometry. The residual flow in the Fromveur Strait, separating Ushant island from Molène archipelago, displays thus a strong asymmetry, between a prominent north-eastern pathway with residual currents up to 0.45 m s −1 and a southward circulation. The positions of cyclonic and anti-cyclonic recirculations, both upstream and downstream the Strait, are furthermore precisely defined. The north eddy is found closely located to the sand bank of the Four. The extraction of tidal stream power impacts mainly the residual Lagrangian circulation along the current stream emerging from the Strait, with a tendency for surrounding eddies to get closer to the tidal stream energy site. The displacements of the south and north recirculations may thus exceed 1.5 km with possible implications on the evolution of surrounding seabed features.

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Section: Numerical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the impact of tidal stream energy extraction on the Lagrangian circulation

Guillou

Chapalain

2017

Applied Energy

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“…The northern part of the "Raz de Sein" is thus characterized by a separation of the flow between the northeastern and northwestern directions, in relation to channels formed on both parts of the islet of Tévennec (Section 2.1, Figures 1 and 4 Following the resource criteria adopted by the Carbon Trust [42], mean kinetic power density should exceed 2.5 kW m −2 for a reasonable economic viability in the setting up of first-generation devices. Along the coasts of France, such power density is found in the Alderney Race (western English Channel) and in the Fromveur Strait (western Brittany) [19,20,43]. In the "Raz de Sein", locations where this power density exceeds 2.5 kW m −2 are restricted to the vicinity of shoals and rocky islets and headlands bordering the strait (Figure 5a).…”

Section: Evaluation Of Model Predictionsmentioning

confidence: 96%

Tidal Turbines’ Layout in a Stream with Asymmetry and Misalignment

Guillou

Chapalain

2017

Energies

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A refined assessment of tidal currents variability is a prerequisite for successful turbine deployment in the marine environment. However, the numerical evaluation of the tidal kinetic energy resource relies, most of the time, on integrated parameters, such as the averaged or maximum stream powers. Predictions from a high resolution three-dimensional model are exploited here to characterize the asymmetry and misalignment between the flood and ebb tidal currents in the "Raz de Sein", a strait off western Brittany (France) with strong potential for array development. A series of parameters is considered to assess resource variability and refine the cartography of local potential tidal stream energy sites. The strait is characterized by strong tidal flow divergence with currents' asymmetry liable to vary output power by 60% over a tidal cycle. Pronounced misalignments over 20 • are furthermore identified in a great part of energetic locations, and this may account for a deficit of the monthly averaged extractable energy by more than 12%. As sea space is limited for turbines, it is finally suggested to aggregate flood and ebb-dominant stream powers on both parts of the strait to output energy with reduced asymmetry.

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“…New nature-based approaches, in this area, are reworking hydraulic engineering and coastal protection towards more sustainable and adaptable designs [189][190][191][192][193]. Sediment transport is also involved in areas where renewable energy production from tidal stream or wave power is foreseen [194,195].…”

Section: A Targeted Research Toomentioning

confidence: 99%

Why and How Do We Study Sediment Transport? Focus on Coastal Zones and Ongoing Methods

Ouillon

2018

Water

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Scientific research on sediment dynamics in the coastal zone and along the littoral zone has evolved considerably over the last four decades. It benefits from a technological revolution that provides the community with cheaper or free tools for in situ study (e.g., sensors, gliders), remote sensing (satellite data, video cameras, drones) or modelling (open source models). These changes favour the transfer of developed methods to monitoring and management services. On the other hand, scientific research is increasingly targeted by public authorities towards finalized studies in relation to societal issues. Shoreline vulnerability is an object of concern that grows after each marine submersion or intense erosion event. Thus, during the last four decades, the production of knowledge on coastal sediment dynamics has evolved considerably, and is in tune with the needs of society. This editorial aims at synthesizing the current revolution in the scientific research related to coastal and littoral hydrosedimentary dynamics, putting into perspective connections between coasts and other geomorphological entities concerned by sediment transport, showing the links between many fragmented approaches of the topic, and introducing the papers published in the special issue of Water on "Sediment transport in coastal waters".

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Numerical modeling of the effect of tidal stream turbines on the hydrodynamics and the sediment transport – Application to the Alderney Race (Raz Blanchard), France

Cited by 112 publications

References 26 publications

Assessing the impact of tidal stream energy extraction on the Lagrangian circulation

Assessing the impact of tidal stream energy extraction on the Lagrangian circulation

Tidal Turbines’ Layout in a Stream with Asymmetry and Misalignment

Why and How Do We Study Sediment Transport? Focus on Coastal Zones and Ongoing Methods

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