Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"tidal stream"”.
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Seabird use of tidal stream environments and potential interactions with tidal energy devices
… demand from renewable energy sources such as tidal streams. However, tidal stream environments are also important habitats for marine wildlife, including seabirds. Risk of collision and habitat displacement are the major negative effects of concern. The following thesis therefore examined the …
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New approach to tidal stream energy analysis at sites in the English Channel
Tidal stream power generation offers the prospect of predictable, low-CO2<br/>power at a number of locations around the UK and the world. Previous<br/>assessments of tidal energy resources have taken the form of desk studies<br/>based on simplified navigational data. Where numerical model data has …
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Investigating the foraging ecology of black guillemots Cepphus grylle in relation to tidal stream turbines and marine protected areas
Tidal streams provide important foraging habitat for several species of marine top predator. This habitat is potentially vulnerable to alteration from the construction of tidal stream turbines. These turbines have been installed in the north of Scotland, with several hundred more planned. Tidal …
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An assessment of tidal energy and the environmental response to extraction at a site in the Pentland Firth
Shelf tidal streams are accelerated by coastal features, such as headlands and islands. In the search for sustainable forms of electricity generation, such locations may become attractive for tidal stream power. For many prospective sites, however, little is known about the intricacies of the local …
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Tidal Energy, Underwater Noise and Marine Mammals
… area of interaction; the potential effect of tidal-stream devices on marine mammals. Collision risk is often cited as a key concern. Therefore, my premise was - for marine mammals to avoid a collision with a marine renewable device (assuming they are on a collision course) they must first …
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Investigation of the interface shearing resistance of steel and concrete on different rocks for renewable energy gravity foundation applications
Tidal stream energy is a form of marine energy with significant advantages compared to other types of offshore renewables, albeit the levelised cost of energy is relatively high. Various types of foundations have been considered for prototype tidal stream generators, however the utilisation of …
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Experimental and numerical assessment of a tidal turbine control strategy
… has led to a number of research developments in tidal stream energy extraction, whereby flowing water is harnessed in a manner similar to the way in which wind turbines generate power from moving air. Unlike wind energy, however, the tides are predictable and thus tidal turbines could provide a …
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Physical suitability of sites for community-scale tidal power generation
Tidal stream energy offers a renewable energy resource in response to global climate change. Most work has focused on the development of large-scale arrays. However, community-scale projects present a more economically viable option with greater flexibility for grid connection and reduced …
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A stakeholder-grounded evaluation of the seven functions model of technological innovation systems theory in UK offshore wind and marine renewables.
… of offshore wind and marine renewables (tidal stream and wave) in the UK since 2000. The research supports the seven existing functions and finds evidence for a new function, which is defined as "relative value potential" (RVP). RVP considers the potential or actual value offered by an …
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Investigating the potential effects of marine renewable energy developments on seabirds
… in the form of extensive wind, wave and tidal-stream resources. Scotland also hosts numerous internationally important<br/>breeding populations of seabirds and Scottish territorial waters represent a key<br/>overwintering area for many species. Several MRED sites in Scotland are located …
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The application of low aspect ratio hydrofoils to the secure positioning of static equipment in tidal streams.
The costs of installing tidal energy technology are high, requiring expensive vessels to drill sockets in the sea bed or to handle gravity based structures of substantial mass, and this impacts on the commercial viability of any proposed marine renewables development. This thesis offers a viable …
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Linear generators for direct drive marine renewable energy converters
… power at the low velocities demanded by wave and tidal stream energy converters requires a large force, which must be reacted by an electrical machine in a direct drive system. Attention is focused on the development of two novel topology linear permanent magnet machines suitable for use in this …
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Drift modelling of marine mammal carcases in coastal waters
… from potentially fatal collisions between tidal-stream turbines and marine mammals. The second applied the reverse problem for known-location mass strandings to highlight potential at-sea mortality sites. The drift properties of carcase-like objects were assessed in at-sea experiments. Wave …
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Using multibeam sonar to monitor animal behaviour and environmental interactions at marine renewable energy sites
… devices might have on the animals that utilise tidal-stream environments has been a major undertaking of marine scientists around the globe. Attention has been paid mainly towards the potential for collision risk and the introduction and increase of marine noise and its corresponding impact on …
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Benthic habitats in a tide-swept channel of the Pentland Firth and their potential responses to a tidal energy development
… impacts arising from the de- ployment of tidal energy devices (TEDs) at a key tidal energy development site. An extensive field campaign was undertaken to collect fine-scale, in-situ data for local hydrodynamics, seabed<br/>structure and epibenthic assemblages. Data from a two-dimensional …
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Precipitation and Sea Level Rise Impacts on Groundwater Levels in Virginia Beach, Virginia
… to cause the groundwater table to increase in tidally influenced areas of Hampton Roads, and thereby decrease storage capacity of the unsaturated zone.</p> <p>This study investigates the spatial and temporal response of the groundwater table to SLR and precipitation. We choose a tidal …
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Environmental influences on banana shrimps of the Sofala Bank, Mozambique Channel
… further research considering a selective tidal stream is needed. Simulated larvae were sensitive to low lethal temperature and river plumes. A conceptual model for the Sofala Bank circulation and another for the banana shrimps, early life history dynamics are proposed based on the results …
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Hydrodynamic Characterisation and Wave Current Interaction around Dunnet Head in the Pentland Firth with Implications for Marine Energy Generation
… very strong flows through the Firth, with local tidal streaming around islands and headlands. Hydrodynamic conditions can be further enhanced by weather systems from the west, especially during autumn and winter storms. As a result, the Pentland Firth and Orkney Waters region is at the global …
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Demand Led Tidal Lagoon Power and Hydrogen Energy Storage - Supervisory Control and Optimisation
Electrical energy generated from a tidal lagoon turbine system is intermittent leading to long periods of no power generation. A system consisting of electrolysers and compression produce hydrogen to storage, while fuel cells supplying power from that storage can bridge the intermittency to meet a …
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Larval fish assemblages of selected estuarine and coastal systems in Kwazulu-Natal, South Africa
… salinity + temperature + turbidity). Analyses of tidal exchange of fish larvae on flood and ebb tides, in Durban Harbour, Richards Bay Harbour and in the St Lucia Estuary mouth, indicated that selective tidal stream transport is a recruitment mechanism employed by certain species (e.g. Argyrosomus …
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