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Society for Underwater Technology – Underwater Technology Journal

Underwater Technology

ISSN 1756 0543 (Print)
ISSN 1756 0551 (Online)

SUT Journal

Underwater Technology is the peer-reviewed international journal of the Society for Underwater Technology. The objectives of the journal are to inform and acquaint the Society's members and other readers with current views and new developments in the broad areas of underwater technology, ocean science and offshore engineering.

Online Open Access

Underwater Technology is now available online as Open Access.

To read more about Underwater Technology and Open Access, please see the following article Open Access to Underwater Technology.

To view full articles online, please visit
http://www.ingentaconnect.com/content/sut/unwt

CrossRef Online Open Access

Current Issue

Underwater Technology Vol 32 No 1
Marine Renewable Energies Special Issue

March 2014

A Personal View

Marine renewable energy: could environmental concerns kill off an environmentally friendly industry?

S Merry

Technical Papers

Control strategies for oscillating water column wave energy converters

K Freeman, M Dai and R Sutton

Abstract: The oscillating water column wave energy converter (OWCWEC) is an established device which produces electricity by causing an ocean wave to drive air through a turbine.
A system to control the operation can improve the device’s performance. In varying sea conditions, different objectives for control may be appropriate. For example, in some seas the controller might shut off the plant because the waves could damage the structure, while in others the controller should operate purely to maximise the energy passed to the electricity grid. The fundamentally nonlinear dynamics of the OWC–WEC influence the choice of control algorithm for the WEC.
Different outcomes in performance may be caused by very small changes in controller action. This is especially true for those OWC–WECs whose characteristics include stalling under certain conditions for optimal performance.
Robustness to uncertainty in inputs and prevention of damage to the structure are necessary. However, too much conservatism will lead to unnecessarily low extracted powers.
In the present paper, the advantages and disadvantages of feed-forward controllers and artificial neural networks previously used on OWC–WECs are discussed, as well as the testing of model predictive control and fuzzy logic controllers in the OWC–WEC context.

 

Coastal shelf model of northern European waters to inform tidal power industry decisions: SMARTtide

SE Bourban, SJ Couch, A Baldock and S Cheeseman

Abstract: Renewable energy extraction from tidal range and/or tidal current technologies in a particular area will affect the hydrodynamics of the local tidal system differently, impacting the tidal resource at the particular site. There may also be a regional effect on the hydrodynamics, affecting other tidal energy extraction schemes’ resource and potential energy yield. The impact of large–scale and/or widespread tidal energy extraction on the tidal energy resource is therefore important to understand in order to inform optimization and management of the UK tidal resource.
The present paper discusses a new tool that has been developed to provide capabilities for pre-feasibility assessments of energy extraction. The tool is called SMARTtide and is based on the 2D module of the open source TELEMAC system, a finite element shallow water solver.
The underlying northern European shelf model behind SMARTtide was commissioned and funded by the Energy Technologies Institute with the overall aim to assess interactions of tidal power energy extraction around the UK. Black & Veatch, HR Wallingford and the University of Edinburgh completed the project. The SMARTtide model comes with various levels of resolution available, including:
• the detailed continental shelf model (DCSM), with 200m resolution at the coast and sites of interest; and
• the coarse continental shelf model (CCSM), with 1km resolution at the coast and sites of interest.
Depending on the energy extraction scenario envisaged, simulation for a representative 15–day spring-neap tidal cycle takes on average less than 2hr for the detailed model and less than 1hr for the coarser model on a supercomputer (nine 12-core processors and one 12-core processor,respectively), which can be seamlessly accessed via a webinterface.

 

Energy from tidal streams: engineering issues, state of the art and future prospects

P Fraenkel

Abstract: The present paper aims to discuss some of the key design issues facing engineers developing tidal turbines and considers the advantages and disadvantages of different designs currently under development. Some detail on the general state of the art and the potential market for this technology is also given

 

Regulating marine renewable energy development: a preliminary assessment of UK permitting processes

G Wright

Abstract: While the UK has implemented a number of reforms to permitting processes to support the emerging marine renewable energy industry, research into the effectiveness of such reforms has been limited. The present paper presents a preliminary assessment of two key aspects of the UK’s regulatory framework: the seabed leasing process and the permitting process. In particular, the Crown Estate seabed leasing process and Scotland’s ‘one–stop shop’ for permitting are discussed. Some concluding thoughts are given regarding the efficacy of these processes, laying the foundation for further research and analysis

Technical Briefing

FP7 EU funded CORES wave energy project: a coordinators’ perspective on the Galway Bay sea trials

R Alcorn, A Blavette, M Healy and A Lewis

Abstract: The present paper gives an overview of the lessons learnt from the project called Components for Ocean Renewable Energy Systems (CORES). In the context of this European funded 7th Framework Programme research project, new components and systems for ocean energy devices were developed and trialed. The present paper also details the work packages, major achievements, significant impacts, summary results and the outcomes of the sea trials.

Book Reviews

Electricity from Wave and Tide: An Introduction to Marine Energy, by Paul A Lynn

Reviewed by Ray Hunter

 

Renewable Energy, Second Edition, by Andy McCrea

Reviewed by Rose Norman

 

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