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Lugo-Fernandez A.,Ocean energy | Leben R.R.,University of Colorado at Boulder
Journal of Physical Oceanography | Year: 2010

A linear correlation exists between the retreat latitude of the Loop Current following eddy separation and the subsequent eddy separation period. This empirical relationship was first identified in satellite altimeter-derived Loop Current metrics. In this paper, a simple vorticity model of the Loop Current is used to provide a semitheoretical basis for this relationship. After suitable scaling approximations, the theory predicts that the LC separation period is a linear function of retreat latitude, which agrees well with altimeter-derived empirical results. Specifically, the predicted slope and y intercept agree to within 9% and 2%, respectively, with the altimetry-derived values. © 2010 American Meteorological Society.


Claisse J.T.,Occidental College | Pondella D.J.,Occidental College | Love M.,University of California at Santa Barbara | Zahn L.A.,Occidental College | And 3 more authors.
Proceedings of the National Academy of Sciences of the United States of America | Year: 2014

Secondary (i.e., heterotrophic or animal) production is a main pathway of energy flow through an ecosystem as it makes energy available to consumers, including humans. Its estimation can play a valuable role in the examination of linkages between ecosystem functions and services. We found that oil and gas platforms off the coast of California have the highest secondary fish production per unit area of seafloor of any marine habitat that has been studied, about an order of magnitude higher than fish communities from other marine ecosystems. Most previous estimates have come from estuarine environments, generally regarded as one of the most productive ecosystems globally. High rates of fish production on these platformsultimately result fromhigh levels of recruitment and the subsequent growth of primarily rockfish (genus Sebastes) larvae and pelagic juveniles to the substantial amount of complex hardscape habitat created by the platform structure distributed throughout the water column. The platforms have a high ratio of structural surface area to seafloor surface area, resulting in large amounts of habitat for juvenile and adult demersal fishes over a relatively small footprint of seafloor. Understanding the biological implications of these structures will inform policy related to the decommissioning of existing (e.g., oil and gas platforms) and implementation of emerging (e.g., wind, marine hydrokinetic) energy technologies. © 2014, National Academy of Sciences. All rights reserved.


Seo S.-N.,Ocean energy | Liu P.L.-F.,Cornell University
Coastal Engineering | Year: 2013

A general solution of linear edge wave, expressed in triple integral form, is obtained for a landslide of an arbitrary shape on a uniformly sloping beach. Utilizing a reliable numerical integration package, surface elevations are computed accurately. Results for various Gaussian landslide shapes are presented by both numerical integrations and an asymptotic method along with numerical integration. Wave fields triggered by landslide motion with different shapes are strongly affected by the initial condition at the early phase but the initial difference decreases as time goes on. The effect of double quadratic finite slide on the generated wave is analyzed. Some evidences for the edge wave behavior of a dispersive water wave are obtained in the present numerical experiments. © 2012 Elsevier B.V.


Grant
Agency: GTR | Branch: Innovate UK | Program: | Phase: Collaborative Research & Development | Award Amount: 307.11K | Year: 2010

The aim of the TSB project was to improve understanding of the AWS-III wave energy system and assess opportunities for performance improvements via a series of model tests at the Kelvin Hydrodynamics Laboratory. This was done in conjunction with complimentary numerical modelling using external and internal modelling resource. 9th, 20th and 50th Scale tests were undertaken to inform and enhance understanding of the device, subsystem components and their behaviours. This led to design improvements, technology developments and learning and understanding of how we can optimise the AWS-III device to improve power performance, survivability and dynamic stability and reduce the resulting cost of energy.


Grant
Agency: Cordis | Branch: FP7 | Program: BSG-SME | Phase: SME-2013-1 | Award Amount: 1.35M | Year: 2014

The Tidal Energy Converter Cost Reduction via Power Take Off Optimisation (TIDAL-EC) project proposes a set of research and development activities to substantially improve the economic competitiveness of a key developing sector of the renewable energy market: that of tidal stream power generation. Two of the largest and most critical components of any mainstream tidal energy converter (TEC) are the power take off (PTO) system (the shaft, bearings and other equipment which connects the turbine blades with the generator) and the electrical generator itself. Experts in the field of turbine and generator testing, the UKs National Renewable Energy Centre (NAREC) together with SME partners Tocardo International (TOCARDO),Ocean Flow Energy (OCEANFLOW), Minesto (MINESTO) & FiberSensing (FIBERSENSING) and Research (RTD) performing partners the University of Edinburgh (UEDIN) and SINTEF (SINTEF), plan to conduct vital research and concept design activities to determine the optimum design of a TEC power take off system and permanent magnet generator (PMG). These radically optimised systems will improve reliability, increase power conversion efficiency and facilitate reduction in the cost of tidal power. In turn, the results of this project will also help SME tidal developers (and their SME suppliers) to be able to offer warranties and guarantees to end customers (European Energy Utilities) and enable large scale roll out of tidal energy in the EU; supporting diversification of the European energy mix and helping to achieve European 2020 renewable energy and carbon emission reduction targets. The formation of the consortium has been carefully considered, in parallel with the resource commitments required to support the proposed programme of work. All consortium members have clearly defined roles and responsibilities within the work programme, and have determined that their return on investment is significant, appropriate and is in alignment with their strategic vision.

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