In-situ database toolbox for short-term dispersion model validation in macro-tidal seas, application for 2D-model

Bois, Pascal Bailly du; Dumas, Franck; Solier, L.; Voiseux, Claire

doi:10.1016/j.csr.2012.01.011

Cited by 68 publications

(74 citation statements)

References 27 publications

(30 reference statements)

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“…This is due to the land masses of the Isle of Eday and Muckle Green Holm within the area creating a natural narrow channel constricting the tidal flow, which leads to the observed increased velocity rates (Norris and Droniou, 2007). In-depth surveys within these types of environments are exceedingly uncommon, due to the complexity of the physical seabed characteristics and the degree of variation of these strong hydrodynamic conditions restricting survey effort (Bailly du Bois et al, 2012). As such, velocity rate information derived from key texts including Chart Datum only provides an initial, basic viewpoint of the system.…”

Section: Tidal Velocity Fish Responsementioning

confidence: 99%

In-situ ecological interactions with a deployed tidal energy device; an observational pilot study

Broadhurst

Barr²

2014

Ocean & Coastal Management

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Section: Tidal Velocity Fish Responsementioning

confidence: 99%

In-situ ecological interactions with a deployed tidal energy device; an observational pilot study

Broadhurst

Barr²

2014

Ocean & Coastal Management

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“…This model solves the shallow non-linear equations using a finite element formulation [46]. The Telemac2D results (water levels and depth-averaged current velocities) have been validated with the in-situ measurements of [47]. The Telemac2D model indicates that the annual power density, defined as 1/2ρU 3 (where U is the depth averaged velocity magnitude), is 5.22 kW/m 2 at the study site.…”

Section: Model Configuration: Wake-field Studymentioning

confidence: 99%

Effects of the Current Direction on the Energy Production of a Tidal Farm: The Case of Raz Blanchard (France)

et al. 2019

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This study aims to investigate the influence of the current direction on the energy production of a tidal turbines array. It is based on a three-dimensional (3D) numerical simulation of the flow where the turbines are represented with actuator disks. The case study consists of modelling the energy extraction of a small array of turbines (staggered and aligned layouts) placed in the Raz Blanchard (Alderney Race, France). The simulations are performed with hydrodynamic data (current magnitude and direction) representative of a mean tide, with several resistance forces and ambient turbulence intensities. The influence of the current direction on the energy production is highlighted by comparing the simulations forced with the real current direction with those in which the angle of incidence between the incoming flow and the turbine's axis is "switched off" (bi-directional flow). When the flow is aligned with the turbines' axis (misalignment "switched off"), the staggered layout produces more than the aligned arrangement. Comparison of the two types of simulations (misalignment switched off or not) shows that the misalignment of the flow around a predominant direction reduces the energy produced by the staggered layout and increases the production of the aligned layout. Furthermore, it suggests that the mean energy produced per machine is almost the same for both layouts. Higher turbulence intensity reduces the positive effect of the directional spreading on the aligned layout production and limits the negative effect on the staggered layout production.The hydrodynamics of tidal energy sites is intricate and often shows an asymmetry in tidal current direction. As an example, the current of the Raz Blanchard, which is located between the Alderney Island and La Hague Cape (Normandy, France), is quasi bidirectional in the Southern part of the Race but is characterized by a high directional spreading in the Northern part. At some locations, the current incidence with respect to the predominant direction reaches up to 30 • [4]. Thus, the multi-directionality of the flow should be considered when optimizing the turbines' arrangement.Numerous numerical modelling studies investigated the effect of the current asymmetry (amplitude and direction) on the production of tidal farms. However, previous studies were essentially performed with regional models where the turbines' thrust was spatially averaged over the area occupied by the tidal farm. This (spatially averaged) turbine representation implies that the interactions between the turbines' wakes are negated [5][6][7][8][9][10][11]. Such regional approach has been used at sites located in West Brittany such as the Sein Race [7] and the Fromveur strait [8], at Scottish sites such as the Orkney archipelago [9], at the Ramsey Sound strait [10], and at the Normand site of the Raz Blanchard [1].Recent works [11][12][13][14] deal with the implementation of methods developed (based on numerical results or experimental mapping) to optimize the identification of suitable sites for ene...

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“…This project follows previous studies concerning model validation with highfrequency in-situ measurements, but which were based solely on surface sampling (Bailly du Bois et al, 2012).…”

Section: Introductionmentioning

confidence: 98%

“…11shows examples of results obtained with dissolved tritium measurements (HTO) near the outfall of the AREVA-NC nuclear reprocessing plant. Positioning of the ship during sampling was assisted by model simulation in order to cross the plume during a known release (Bailly duBois et al 2012).…”

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confidence: 99%

System for high-frequency simultaneous water sampling at several depths during sailing

Bois

Pouderoux²,

Dumas

2014

Ocean Engineering

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a b s t r a c tA system allowing high-frequency sampling at several depths simultaneously have been developed. It could be used in a strong current area close to the coast with frequent 1801 half-turn. It includes three main components: (i) a line able to sample at ten depths simultaneously, (ii) the Dynalest, a deep-towed depressor that maintains the line submerged at depth with a lift/drag ratio of 80, and (iii) an automatic high-frequency sampler with volume and flux control. The system was designed to collect samples for validation of 3D hydrodynamic models in the plume close to a seabed outfall with 4 m s À 1 tidal currents (La Hague Cape). During sampling, the ship was operating normally at speeds of 0.5-5 m s À 1 with frequent half-turns. Ten depth levels were sampled simultaneously every 30 s from 0 to 20 or 55 m depth. More than 13,000 samples were collected during a five days campaign. Vertical slices pictures of a dispersion plume where obtained each 5-10 min (100-200 measurements each one). The different parts of the system may be used separately or together. It can be adapted for varied conditions as greater depths, more vertical levels of simultaneous in-depth sampling or large volumes.

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In-situ database toolbox for short-term dispersion model validation in macro-tidal seas, application for 2D-model

Cited by 68 publications

References 27 publications

In-situ ecological interactions with a deployed tidal energy device; an observational pilot study

In-situ ecological interactions with a deployed tidal energy device; an observational pilot study

Effects of the Current Direction on the Energy Production of a Tidal Farm: The Case of Raz Blanchard (France)

System for high-frequency simultaneous water sampling at several depths during sailing

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