Marine Energy Devices for Colombian Seas

2010 ◽  
Author(s):  
Julio C. Correa ◽  
Diego A. Flo´rez ◽  
Norha L. Posada ◽  
Rau´l A. Valencia ◽  
Carlos A. Zuluaga
Keyword(s):  
Best Available Technologies ◽  
Energy Devices ◽  
Preliminary Results ◽  
Marine Energy

There are several alternatives to obtain marine energy: waves, tides, currents, gradients of temperature and gradients of salinity. All of them have been studied extensively, however their implementation is closely related to the particular conditions of the local sea. This paper presents preliminary results related with the kind of the instrumentation required to monitor the behavior of the variables associated with marine energy and the best available technologies to take advantage of the marine power in the Colombian seas.

scholarly journals Biological Consequences of Marine Energy Development on Marine Animals

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8460
Author(s):  
Lenaïg G. Hemery ◽  
Andrea E. Copping ◽  
Dorian M. Overhus
Keyword(s):  
Anthropogenic Activities ◽  
Energy Systems ◽  
Energy Development ◽  
Knowledge Gaps ◽  
Marine Animals ◽  
Natural Habitats ◽  
Holistic View ◽  
Energy Devices ◽  
Marine Energy ◽  
Animal Populations

Marine energy devices harness power from attributes of ocean water to form a sustainable energy source. Knowledge gaps remain about whether marine energy systems can affect the environment, adding another threat to animal populations and habitats already under pressure from climate change and anthropogenic activities. To date, potential environmental effects have been studied under the scope of stressor–receptor interactions, where moving parts of, or emissions from, a system could harm the animals, habitats, and natural processes. While crucial for understanding effects and identifying knowledge gaps, this approach misses a holistic view of what animals may experience in the presence of marine energy systems. We look at six biological consequences and forces that drive the health of an animal population and the effects expected from marine energy development: success of early life stages; changes in competitive capabilities; growth and survival based on food availability; susceptibility to predators; injury or death; and reproductive success. We use case studies to develop this approach, focusing on a variety of marine animals. An approximate level of risk is assigned for each interaction based on the biological consequences. This work highlights the need to examine the effects of marine energy development on animal populations within their natural habitats.

Life cycle comparison of a wave and tidal energy device

2011 ◽  
Vol 225 (4) ◽  
pp. 325-337 ◽  
Author(s):  
S Walker ◽  
R Howell
Keyword(s):  
Life Cycle ◽  
Wave Energy ◽  
Tidal Energy ◽  
Development Stage ◽  
Payback Period ◽  
Energy Device ◽  
Energy Mix ◽  
Energy Devices ◽  
Marine Energy ◽  
Marine Current

Tidal and wave energy devices are often discussed as a future contributor to the UK’s energy mix. Indeed, marine energy resources are said to have the potential to supply up to 20 per cent of the nation’s electricity demand. However, these technologies are currently at the development stage and make no meaningful contribution to the national grid. A number of devices have been developed, but no single method has emerged as the leading technology. This paper aims to compare two promising devices, one wave device and one tidal device, and assess the life cycle properties of each. A life cycle assessment of the Oyster wave energy device was conducted as part of this study, and a comparison of this and the SeaGen marine current turbine was undertaken. In both cases a ‘cradle-to-grave’ assessment was carried out, calculating emissions from materials, fabrication, transport, installation, lifetime maintenance, and decommissioning (including recycling). The SeaGen tidal device was calculated to have an energy payback period of 14 months, and a CO2 payback period of 8 months. The equivalent figures for the Oyster device were 12 and 8 months, respectively. The respective energy and carbon intensities for the two devices were 214 kJ/kWh and 15 gCO2/kWh for the SeaGen and 236 kJ/kWh and 25 gCO2/kWh for the Oyster. The calculated intensities and payback periods are close to those of established wind turbine technologies, and low relative to the 400–1000 g CO2/kWh of typical fossil fuel generation. With further developments in construction and deployment efficiency these intensities are expected to fall, so the devices appear to have the potential to offer a viable contribution to the UK’s future energy mix.

scholarly journals Analysis of the Effects of the Location of Passive Control Devices on the Platform of a Floating Wind Turbine

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2850
Author(s):  
Antonio Galán-Lavado ◽  
Matilde Santos
Keyword(s):  
Wind Turbine ◽  
Structural Control ◽  
Passive Control ◽  
Offshore Wind ◽  
Energy Devices ◽  
Hard Constraints ◽  
Marine Energy ◽  
Floating Offshore Wind Turbines ◽  
Control Devices ◽  
The Stability

Floating offshore wind turbines (FOWT) are subjected to strong loads, mainly due to wind and waves. These disturbances cause undesirable vibrations that affect the structure of these devices, increasing the fatigue and reducing its energy efficiency. Among others, a possible way to enhance the performance of these wind energy devices installed in deep waters is to combine them with other marine energy systems, which may, in addition, improve its stability. The purpose of this work is to analyze the effects that installing some devices on the platform of a barge-type wind turbine have on the vibrations of the structure. To do so, two passive control devices, TMD (Tuned Mass Damper), have been installed on the platform of the floating device, with different positions and orientations. TMDs are usually installed in the nacelle or in the tower, which imposes space, weight, and size hard constraints. An analysis has been carried out, using the FAST software model of the NREL-5MW FOWT. The results of the suppression rate of the tower top displacement and the platform pitch have been obtained for different locations of the structural control devices. They have been compared with the system without TMD. As a conclusion, it is possible to say that these passive devices can improve the stability of the FOWT and reduce the vibrations of the marine turbine. However, it is indispensable to carry out a previous analysis to find the optimal orientation and position of the TMDs on the platform.

Monitor the Impact of Marine Renewable Energy Devices on Local Environment

2013 ◽  
Vol 448-453 ◽  
pp. 1620-1623
Author(s):  
Jia Liu ◽  
Feng Xu ◽  
Xu Dong An ◽  
Qiao Zhang ◽  
Juan Yang
Keyword(s):  
Renewable Energy ◽  
Local Environment ◽  
Global Scale ◽  
Energy Device ◽  
Energy Devices ◽  
Marine Renewable Energy ◽  
Underwater Environment ◽  
Marine Energy ◽  
Development And Utilization ◽  
The Impact

The development and utilization of clean and renewable marine energy sources will be a way for the development of economy. Although on a global scale the advantages of renewable energy are not in doubt, the impacts on the local environment must be carefully considered. The sonar devices could be used to monitor the underwater environment around the marine renewable energy device. In this paper, a Multi-beam Echo Sounder is introduced. And the measured results in a lake are given, which are shown that this sonar could detection the fish effectively.

scholarly journals What’s in My Toolkit? A Review of Technologies for Assessing Changes in Habitats Caused by Marine Energy Development

2022 ◽  
Vol 10 (1) ◽  
pp. 92
Author(s):  
Lenaïg G. Hemery ◽  
Kailan F. Mackereth ◽  
Levy G. Tugade
Keyword(s):  
Oil And Gas ◽  
Grey Literature ◽  
Wind Farms ◽  
Energy Development ◽  
Offshore Wind ◽  
Offshore Wind Farms ◽  
Energy Devices ◽  
Marine Habitats ◽  
Marine Energy ◽  
Daunting Task

Marine energy devices are installed in highly dynamic environments and have the potential to affect the benthic and pelagic habitats around them. Regulatory bodies often require baseline characterization and/or post-installation monitoring to determine whether changes in these habitats are being observed. However, a great diversity of technologies is available for surveying and sampling marine habitats, and selecting the most suitable instrument to identify and measure changes in habitats at marine energy sites can become a daunting task. We conducted a thorough review of journal articles, survey reports, and grey literature to extract information about the technologies used, the data collection and processing methods, and the performance and effectiveness of these instruments. We examined documents related to marine energy development, offshore wind farms, oil and gas offshore sites, and other marine industries around the world over the last 20 years. A total of 120 different technologies were identified across six main habitat categories: seafloor, sediment, infauna, epifauna, pelagic, and biofouling. The technologies were organized into 12 broad technology classes: acoustic, corer, dredge, grab, hook and line, net and trawl, plate, remote sensing, scrape samples, trap, visual, and others. Visual was the most common and the most diverse technology class, with applications across all six habitat categories. Technologies and sampling methods that are designed for working efficiently in energetic environments have greater success at marine energy sites. In addition, sampling designs and statistical analyses should be carefully thought through to identify differences in faunal assemblages and spatiotemporal changes in habitats.

scholarly journals An Alternative Technique for Ultra-high Resolution Bathymetry and Seabed Inspection for Marine Renewables

2020 ◽  
Author(s):  
Francisco Gemo Albino Francisco ◽  
Jan Sundberg
Keyword(s):  
Renewable Energy ◽  
High Resolution ◽  
Ocean Energy ◽  
Energy Devices ◽  
Energy Applications ◽  
Marine Renewable Energy ◽  
Marine Energy ◽  
Dual Beam ◽  
Energy Projects ◽  
Monitoring Platform

Marine renewable energy technologies have a great potential in supplying clean electricity to millions of people across the globe, if technical and economic conditions are in right. So far, ocean energy projects are commonly started by SMEs or educational institutions with limited budgets. Therefore, any effort to reduce expenses is of great value. One of the areas involving substantial expenses are the inevitable seabed inspection prior to deployment of marine renewable energy device. Detailed seabed inspections can also reduce the risk of associated with deployment of structures on uneven seabed, especially marine renewable energy devices with gravity foundations. By reducing the costs and risks of such surveys prior and during the installation phases, the feasibility of marine renewable energy projects can be more favoured and competitive. In this perspective, this study proposes a cost and time effective technique for seabed surveys. The proposed technique involves the use of high precision and inexpensive sonar systems and underwater optical cameras integrated into a versatile and compact subsea monitoring platform. It also involves simple and practical data acquisition and processing protocols that do not requires hi expertise for operation. The results obtained showed that high resolution bathymetric maps and detailed seabed inspections imagery can be acquired. This study concludes that a simple and inexpensive subsea monitoring platform comprising a multibeam, dual beam and video cameras can be effective for high resolution seabed inspection and bathymetric measurements for marine energy applications.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

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