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| Registros recuperados: 30 | |
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| Prevosto, Marc; Maisondieu, Christophe; Forristall, George Z.; Jeans, Gus; Harrington-missin, Liam; Watson, Andrew; Harte, Gavin; Dooley, Patrick; Frelin, Cyril; Herry, Christelle; Muller, Héloïse; Casitas, Sophie. |
| The design of catenary risers, riser towers, and export lines is key to oil and gas production in the deep ocean. Winds, waves, surface currents and current profiles are essential inputs to the design of these riser systems. With regards to current loading, the variety and abundance of current profiles can make it difficult to determine which profiles are most appropriate for determining extreme and fatigue loading on risers. The choices become increasingly difficult on the frontier of deepwater oil and gas developments as risers are increasingly being required to successfully operate in harsher environments and deeper water. However, longer and more detailed current measurements from in-situ deployments continue to become available. Two or three year... |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00499/61056/64504.pdf |
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| Boudiere, Edwige; Maisondieu, Christophe; Ardhuin, Fabrice; Accensi, Mickael; Pineau-guillou, Lucia; Lepesqueur, Jeremy. |
| Resource assessment as well as characterisation of site climatologies for the design of Marine Energy Converters requires data bases allowing an accurate description of the environmental forcing, especially waves and sea-states, on a high resolution grid. As a support to its research activities related to the development of marine renewable energies, Ifremer is building a specific hindcast data set for the assessment of sea-states climatologies. The main features of this database, built running an up-to-date configuration of the WaveWatch III® wave model on an unstructured grid extending from the South of the North Sea to the Bay of Biscay are presented here. Attention is given to the parameterization and forcing as well as the specific output data sets... |
| Tipo: Text |
Palavras-chave: Directional spectra; Hindcast; WAVEWATCH III®; Marine renewable energy. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00164/27524/25710.pdf |
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| Boudiere, Edwige; Maisondieu, Christophe; Ardhuin, Fabrice; Accensi, Mickael; Pineau-guillou, Lucia; Lepesqueur, Jeremy. |
| The number of Marine Renewable Energy projects has rapidly raised over the last decades. Those require a refined description of environmental conditions, such as sea states, for resource assessments as well as for the conception of the Marine Energy Converters. Engineering studies require long-term data sets so as to assess temporal variability and extreme events of sea states at the scale of the implantation sites.,As a support to its research studies on Marine Renewable Energy, Ifremer is building a specific hindcast database, running the wave model WAVEWATCH III® on an unstructured grid. The wave model extends over the area from the South of the North Sea to the Bay of Biscay with a high spatial resolution and covers a 16 years period from 1996 to 2012.... |
| Tipo: Text |
Palavras-chave: Spectre directionnel; Hindcast; WAVEWATCH III®; Énergie marine renouvelable; Directional spectra; Hindcast; WAVEWATCH III®; Marine renewable energy. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00203/31418/29813.pdf |
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| Venugopal, Vengatesan; Davey, Thomas; Smith, Helen; Smith, George; Holmes, Brian; Barrett, Sean; Prevosto, Marc; Maisondieu, Christophe; Cavalieri, Luigi; Bertotti, Luciana; Lawrence, John; Girard, Francoise. |
| This report gives guidance relevant to the resource assessment of sites considered for the deployment of wave and tidal energy converters. Areas considered include: instrumentation and measurement; techniques and requirements for wave and tidal parameterisation; wave-current interaction; spatial and temporal variation. A number of case studies are also included examining several European sites. |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00250/36152/34706.pdf |
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| Filipot, Jean-francois; Prevosto, Marc; Maisondieu, Christophe; Le Boulluec, Marc; Thomson, Jim. |
| This work presents the analysis of wave and turbulence measurements collected at a tidal energy site. A new method is introduced to produce more consistent and rigorous estimations of the velocity fluctuations power spectral densities. An analytical function is further proposed to fit the observed spectra and could be input to the numerical models predicting power production and structural loading on tidal turbines. Another new approach is developed to correct for the effect of the Doppler noise on the high frequencies power spectral densities. The analysis of velocity time series combining wave and turbulent contributions demonstrates that the turbulent motions are coherent throughout the water column, rendering the wave coherence-based methods not... |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00254/36537/35074.pdf |
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| Guanche Garcia, Yanira; Prevosto, Marc; Maisondieu, Christophe; Bulteau, Thomas; Paris, François. |
| The knowledge of extreme events of environmental variables is an issue of increasing concern to the scientific community. Within the branch of coastal and ocean engineering there are many fields of application where an accurate estimation of long term return period events is needed, i.e. coastal defenses design, coastal flooding management, estimation of changes of the littoral morphology, offshore and onshore renewable energy devices design, etc. But not only the engineers are concerned by extreme events; biological communities in the open sea and estuarine systems are also exposed to extreme events that may affect its natural development (i.e. extreme sea levels in estuarine environments could raze fields of plants not able to deal with salt in just a... |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00378/48967/49370.pdf |
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| Maisondieu, Christophe; Forest, Bertrand. |
| The SAR-DRIFT project aims at developing a forecast system for localisation of drifting objects, as well as decision aid tools for Maritime Search and Rescue. Its basic principle is to predict the position of drifting objects, when combining environmental measurements and forecast through sophisticated stochastic modelling. Among the different tasks of the project, one is to assess the hydrodynamic behaviour of various objects drifting at sea when submitted to the joint action of wind, waves and currents. Thousands of cargo containers are reported to fall overboard each year. A significant part of these containers will stay afloat from several hours to several weeks and represent a major hazard to navigation. In order to evaluate the drift coefficients of... |
| Tipo: Text |
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| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00238/34970/33472.pdf |
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| Maisondieu, Christophe; Johanning, Lars. |
| This report is a deliverable of MERiFIC Task 3. 6: ‘Installation Procedures’ and has been produced in a cross border collaboration between IFREMER and the University of Exeter. In this report different elements are presented for the planning and organisation of installation operations for the deployment of Marine energy plants. The optimization of installation procedures are discussed and brought in a context to potential costs optimization and the availability of suitable vessels is considered. Installation procedures, which were also investigated, should include pre-installation surveys so as to optimize the design of moorings and secure laying of the power cable, a specific feature of the commissioning of such Marine energy plants. Attention should... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00203/31445/29843.pdf |
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| Clement, Alain; Maisondieu, Christophe. |
| In this paper, we suggest two causal non-ideal approximations of this ideal non-causal controller. These time-domain absorbing relations differ in whether or not one knows a dominant frequency of the incident wave train to be absorbed. Their performances are compared to the absorption efficiency of the low frequency asymptotic Sommerfeld relation. Preliminary results of this study were already presented in Maisondieu and al. (1993). |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00203/31437/29833.pdf |
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| Maisondieu, Christophe; Le Boulluec, Marc. |
| When considering deployment of wave energy converters at a given site, it is of prime importance from both a technical and an economical point of view to accurately assess the total yearly energy that can be extracted by the given device. Especially, to be considered is the assessment of the efficiency of the device over the widest span of the sea-states spectral bandwidth. Hence, the aim of this study is to assess the biases and errors introduced on extracted power classically computed using spectral data derived from analytical functions such as a JONSWAP spectrum, compared to the power derived using actual wave spectra obtained from a spectral hindcast database. |
| Tipo: Text |
Palavras-chave: Wave energy; Wave spectra; Hindcast; Resource assessment. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00347/45799/45445.pdf |
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| Registros recuperados: 30 | |
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