Modelling the influence of Tidal Energy Converters on sediment dynamics in Banks Strait, Tasmania

Auguste, Christelle; Nader, Jean-Roch; Marsh, Philip; Penesis, Irene; Cossu, Remo

doi:10.1016/j.renene.2022.02.077

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…The influence of marine energy converters on hydrodynamic and sediment dynamics is not well known, and primarily theoretical, since collecting samples in these dynamic marine environments is difficult (Auguste et al, 2019), and it is challenging to assess sediment properties pre-and postconstruction. To select a suitable site for the installation and Typical sediment grain size distributions shown for two contrasting sites.…”

Section: Discussionmentioning

confidence: 99%

Characterizing seabed sediments at contrasting offshore renewable energy sites

2023

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Due to the impacts of climate change, there is an urgent need to scale up existing, and develop novel, renewable energy technologies. Although there are many types of renewable energy technology, ocean renewable energy, including established offshore wind, and novel wave and tidal energy converters, offers many opportunities due to the abundance of the resource, availability of sea space, and (for tidal) predictability. However, the extraction of energy from the ocean environment will influence sediment dynamics and morphodynamics at various temporal and spatial scales. Detailed knowledge of seabed properties is also important for device installation, affecting foundation design and cabling. In this study, 36 seabed sediment samples were collected across a region of the Irish Sea extending from the west of Anglesey into Liverpool Bay up to a maximum distance of around 35 km offshore – a region where there are many existing and planned ocean renewable energy projects. Particle size analysis at quarter phi intervals was used to calculate the statistical properties of the seabed sediment samples, including Mean grain size, Sorting, Skewness and Kurtosis. These properties were compared against the outputs of wave (SWAN) and tidal (TELEMAC) models of the region to investigate the relationship between environmental variables and sediment characteristics, and to determine the impact and challenges of renewable energy technologies deployed in the region. Most of the sediments in the study area are medium sand, polymodal, very poorly sorted, coarse skewed, and very platykurtic. We found that mean water depth and peak current speed have the largest influence on Median grain size, and Sorting can be affected by tidal range, in addition to water depth and peak current speed. Moreover, minimal influence of wave climate was found on the sediments. A thorough discussion based on a literature review of the environmental issues of various energy converters (tidal energy converter (both individual and arrays), tidal barrage/lagoons, and wind turbines) was used to determine how devices in the study region, and at other sites throughout the world, would interact with sediment dynamics. We make recommendations on ways to minimize environmental impacts of ocean energy technologies.

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Section: Discussionmentioning

confidence: 99%

Characterizing seabed sediments at contrasting offshore renewable energy sites

2023

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“…Furthermore, the nature and timeline of this impact imply that a disturbance to the seabed due to anthropogenic processes such as dredging of materials for OWF cable burial or as a source of marine aggregates has the potential to impact erosion and accretion rates and bedform dynamics further along the sediment transport pathway [8]. Similarly, studies have shown that ORE developments alter current and wave propagation [2,4,7,10,12,13,59]. In this way, with the increase in planned anthropogenic activities, a robust marine spatial plan must incorporate a risk assessment that analyses potential changes to the hydrodynamic processes controlling seabed stability identified in this study and in Creane et al [17].…”

Section: Influence Of External Sediment Sources On Arklow Bank's Loca...mentioning

confidence: 99%

“…With the acceleration of the offshore renewable energy industry and future needs for aggregate material, the demand for marine resources is increasing. Many of these offshore anthropogenic activities, such as dredging and the installation of offshore renewable energy (ORE) infrastructure, can affect wave propagation, flow patterns, and sediment circulation [2][3][4][5][6][7][8][9]. In the near field, these changes have the potential to alter marine biogeochemistry, including marine life behaviour, phytoplankton dynamics, and benthic habitats [10,11].…”

Section: Introductionmentioning

confidence: 99%

Morphological Modelling to Investigate the Role of External Sediment Sources and Wind and Wave-Induced Flow on Sand Bank Sustainability: An Arklow Bank Case Study

Creane,

O’Shea,

Coughlan

et al. 2023

JMSE

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Offshore anthropogenic activities such as the installation of Offshore Renewable Energy (ORE) developments and sediment extraction for marine aggregates have been shown to disrupt current flow, wave propagation, and sediment transport pathways, leading to potential environmental instability. Due to the complexity of the interconnected sediment transport pathways in the south-western Irish Sea combined with an increase in planned anthropogenic activities, the assessment of this risk is imperative for the development of a robust marine spatial plan. Subsequently, this study uses two-dimensional morphological modelling to build upon previous studies to assess the dependency of Arklow Bank’s local sediment transport regime on external sediment sources. Additionally, scenario modelling is used to identify vulnerable areas of this offshore linear sand bank to wind and wave-forcing and to examine the nature of this impact. A sediment budget is estimated for Arklow Bank, whereby seven source and nine sink pathways are identified. New evidence to support the exchange of sediment between offshore sand banks and offshore independent sand wave fields is also provided. The areas of the bank most vulnerable to changes in external sediment sources and the addition of wind- and wave-induced flow are analogous. These high vulnerability zones (HVZs) align with regions of residual cross-flow under pure current conditions. The restriction of sediment sources off the southern extent of Arklow Bank impacts erosion and accretion patterns in the mid- and northern sections of the bank after just one lunar month of simulation. Where tidal current is the primary driver of sand bank morphodynamics, wind- and wave-induced flow is shown to temporarily alter sediment distribution patterns. Wind and wave-induced flow can both accelerate and decelerate the east-west fluctuation of the upper slopes of the bank, yet the nature of this impact is inconsistent due to the misalignment of the directionality of these two forces. The methods and new knowledge derived from this study are directly applicable to tidally-dominated environments outside the Irish Sea.

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“…In recent years, many researchers from both academic and industry have focused on utilizing wind [1][2][3][4], solar [5][6][7], tidal [8,9], and geothermal energies [10][11][12] to alleviate the serious energy crisis and environmental pollution. It is worth noting that harvesting the kinetic energy from human body to power portable electronic devices is a hot research topic in the last decade, such as converting the energy of the knee [13,14], waist [15,16], foot [17], wrist [18], and breathing [19] into electrical energy.…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

Zhang¹,

Zhang²,

Wang³

et al. 2022

Smart Mater. Struct.

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This paper presents an asymmetric magnetic coupling piezoelectric energy harvester based on galloping to scavenge low-speed wind. The piezoelectric beam of energy harvester undergoes bending and torsional vibration simultaneously due to the eccentric distance. By analyzing the kinetic energy, potential energy, and virtual work of the energy harvesting system, the mathematical model of harvester is constructed and verified by experiments. The optimal external load resistance is confirmed at different eccentric distances and wind speeds by experiments. Compared with traditional galloping piezoelectric energy harvester, the asymmetric with magnetically coupling galloping piezoelectric energy harvester has a lower threshold wind speed, i.e. 2 m/s. And the asymmetric configuration contributes to a lower natural frequency and electromechanical coupling coefficient, which results in a lower power and voltage output. The potential energy of harvesting systems at different distances between two magnets are respectively numerical analyzed in detail. The theorical results illustrate that the energy harvester operates in monostable and bistable at different magnet distances. And the threshold wind speed of energy harvester increases when the energy harvester works at bistable. According to the above analysis, this work provides a detailed guideline for mathematical modeling and performance improvement of asymmetric piezoelectric energy harvester based on galloping.

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Modelling the influence of Tidal Energy Converters on sediment dynamics in Banks Strait, Tasmania

Cited by 8 publications

References 35 publications

Characterizing seabed sediments at contrasting offshore renewable energy sites

Characterizing seabed sediments at contrasting offshore renewable energy sites

Morphological Modelling to Investigate the Role of External Sediment Sources and Wind and Wave-Induced Flow on Sand Bank Sustainability: An Arklow Bank Case Study

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

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