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Registros recuperados: 28
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A realizable force feedback-feedforward control loop for a piston wave absorber ArchiMer
Maisondieu, Christophe; Clément, Alain.
We consider the problem of the absorption of 2D water waves by the horizontal motions of a vertical plane in response to the hydrodynamical force it experiences. The solution of this problem is straightforward in the frequency domain. Unfortunately, the transposition of the frequency domain solution to the time domain by inverse Fourier transforming leads to a non-causal impulse response function. Thus it cannot be used just as it is, neither as a control loop for physical absorbing devices nor as a non radiating boundary condition (NRBC) in numerical modeling. In this paper, we propose a method to derive causal approximations of this ideal controller. Two time-domain absorbing relations are proposed, differing in whether or not one knows a dominant...
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00203/31436/29832.pdf
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A suitable metocean hindcast database for the design of Marine energy converters ArchiMer
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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Advances in Search and Rescue at Sea ArchiMer
Breivik, Oyvind; Allen, Arthur Addoms; Maisondieu, Christophe; Olagnon, Michel.
A topical collection on “Advances in Search and Rescue at Sea” has appeared in recent issues of Ocean Dynamics following the latest in a series of workshops on “Technologies for Search and Rescue and other Emergency Marine Operations” (2004, 2006, 2008 and 2011), hosted by IFREMER in Brest, France. Here we give a brief overview of the history of search and rescue at sea before we summarize the main results of the papers that have appeared in the topical collection.
Tipo: Text Palavras-chave: Search and rescue (SAR); Trajectory modeling; Stochastic Lagrangian ocean models; Lagrangian measurement methods; Ocean surface currents.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00102/21311/19567.pdf
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Analyses of Environmental time series: Extreme Values ArchiMer
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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Barge pour environnements type Bresil : essais en bassin ArchiMer
Le Boulluec, Marc; Maisondieu, Christophe; Du Plessix, Guillaume; Cordeau, Cyril.
drilling capability designed by SAIPEM for oil production offshore Brazil or area with equivalent environmental conditions. A central moon-pool is surrounded by a system of walls and columns above an immersed pontoon. An upper deck is situated above the water line. Sea water can flow between walls and columns above the pontoon. The aim of wave tank experiments is to validate the preliminary sea keeping calculations and study the free surface effects inside the moon-pool and above the pontoon.
Tipo: Text Palavras-chave: Hydrodynamique; Essais en bassin; Houle; Surélévations; Diffraction; Radiation; Moon-pool.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00170/28169/26403.pdf
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Benefits of using a spectral hindcast database for wave power extraction assessment ArchiMer
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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Best practice report - Installation procedures. Deliverable 3.6.2 from the MERiFIC Project ArchiMer
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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Best practice report – Operation and Maintenance requirements. Deliverable 3.6.3 from the MERiFIC Project ArchiMer
Maisondieu, Christophe; Johanning, Lars; Weller, Samuel.
This report is a deliverable of MERiFIC Work Package 3.6: ‘Operation and Maintenance requirements’ and has been produced as a cross border collaboration between IFREMER and the University of Exeter. The report provides an overview of guidelines and recommendations for the management of O&M operations necessary for an optimal exploitation of Marine energy plants, with a focus on the specific areas of South West Cornwall, UK and Iroise sea, Brittany, France. An overview of the onshore infrastructures and ports possibly suitable for management of such O&M operations is also provided. Management of scheduled and unscheduled maintenance operations are discussed in their various aspects including site accessibility. It should be noted that this topic,...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00203/31443/29841.pdf
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Comparison of Time domain Control Law for a Piston wave Absorber ArchiMer
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).
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00203/31437/29833.pdf
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Container Drift Assessment - Iroise Sea Experiment. Sar-Drift Project ArchiMer
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...
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/00238/34970/33472.pdf
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Dynamical partitioning of directional ocean wave spectra ArchiMer
Ailliot, Pierre; Maisondieu, Christophe; Monbet, Valerie.
Directional wave spectra generally exhibit several peaks due to the coexistence of wind sea generated by local wind conditions and swells originating from distant weather systems. This paper proposes a new algorithm for partitioning such spectra and retrieving the various systems which compose a complex sea-state. It is based on a sequential Monte-Carlo algorithm which allows to follow the time evolution of the various systems. The proposed methodology is validated on both synthetic and real spectra and the results are compared with a method commonly used in the literature.
Tipo: Text Palavras-chave: Partitioning algorithm; Directional wave spectrum; Sequential Monte Carlo algorithm.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00134/24563/22688.pdf
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EquiMar. Deliverable D2.2. Wave and tidal resource characterisation ArchiMer
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.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00250/36152/34706.pdf
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Evolution morphodynamique cross-shore d’un estran vaseux ArchiMer
Monbet, Valerie; Maisondieu, Christophe; Le Hir, Pierre.
The main goal of this study consists in evaluating the combined effect of cross-shore waves and current on the long term evolution of a mud flat profile. An original method is used to create a database of realistic wind fields and sea states. These data are applied to a numerical model of sediment transport and morphological changes. A description of long term simulations is proposed.
Tipo: Text Palavras-chave: Morphodynamique; Estran vaseux; Courant de marée; États de mer; Mer du vent.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/00203/31429/29824.pdf
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Field determination of the leeway of drifting objects ArchiMer
Allen, Arthur; Roth, Jens-christian; Maisondieu, Christophe; Breivik, Oyvind; Forest, Bertrand.
The leeway (windage) of five typical SAR/HAZMAT objects (person in water, mine, small sailboat, small open boat and a 20-ft container) and is studied. The method is applicable to objects smaller than 30m
Tipo: Text Palavras-chave: SAR; HAZMAT; Trajectory models; Leeway; Windage; Surface drift; Operational oceanography.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00254/36492/35036.pdf
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Génération de bases de données océano-météorologiques pour l'élaboration de climatologies adaptées au dimensionnement des structures en mer ArchiMer
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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L'absorption Dynamique des Ondes de Gravité en Régime Instationnaire ArchiMer
Maisondieu, Christophe.
This study deals with the dynamic absorption of water waves. We focus here our attention on the case of a simple devce, a 2D piston, in order to exploit the well-known expressions of the potential as far as possible in the design of new absorption laws. We consider a semi-infinite two dimensional wave tank closed by a mobile vertical plane. An unsteady wave train generated at infinity impiges on this plate. The problem of the dynamic absorption consists in finding, in real time, the velocity to be given to the plate so that the radiated and the reflected wave trains should cancel each other. We propose here to derive this velocity from the forces measured on the plate. We first derive a frequency dependant transfer function between the optimal velocity of...
Tipo: Text Palavras-chave: Hydrodynamique; Ecoulements à surface libre Instationnaire; Absorption Dynamique; Ondes de Gravité Causalité; Identification; Feedback/Feedforward.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00186/29739/29812.pdf
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Manuel de l'utilisateur de la base de données HOMERE. Mise à jour 2017 du jeu de données de hindcast ArchiMer
Maisondieu, Christophe; Accensi, Mickael; Le Roux, Jean-francois; Boudière, Edwige.
La base de données de rejeu d'états de mer HOMERE a été mise en place par les équipes de l'Ifremer du laboratoire de Comportement des Structures en Mer (RDT/LCSM) et du Laboratoire d'Océanographie Physique et Spatiale (LOPS). Cette base de données consiste en un ensemble de paramètres permettant de décrire les caractéristiques principales et l'évolution des conditions d'états de mer sur la zone de la Manche et du Golfe de Gascogne. Initialement développée pour répondre aux besoins liés aux études sur la caractérisation de la ressource et du comportement des structures en mer, en particulier dans le domaine des énergies marines renouvelables, son champ d’application est en fait, de par l’ensemble des paramètres et l’information spectrale disponibles, mais...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00415/52606/53440.pdf
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Refined sea state analysis from an array of four identical directional buoys deployed off the Northern Cornish coast (UK) ArchiMer
Saulnier, Jean Baptiste; Maisondieu, Christophe; Ashton, Ian; Smith, George H..
This paper presents an analysis of sea states carried out from extended wave measurements realized near the Wave Hub wave energy test facility in Cornwall (UK). The space directional information is derived from the spectro-directional processing of time-domain data provided by an array of four independent SEAWATCH Mini II displacement buoys separated by an approximate average distance of 500 m. It is observed that, even though the size of the array is small compared to the local wave trains' length, the estimation of the directional spectra - using maximum entropy and likelihood methods - may sometimes exhibit certain space variability over the array. It was also observed that the tidal currents variations produced a significant influence upon the wave...
Tipo: Text Palavras-chave: Directional wave spectrum; Directional buoys; Buoys array; Maximum entropy method; Maximum Likelihood Method; Sea state; Wave system; Spectro-directional partitioning; Wave stationarity/homogeneity; Wave/tide interactions.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20922/18739.pdf
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Refinements of sea state statistics for marine renewables: A case study from simultaneous buoy measurements in Portugal ArchiMer
Saulnier, Jean Baptiste; Prevosto, Marc; Maisondieu, Christophe.
This paper presents a refined description of the wave climate observed in a Portuguese location for marine energy projects. The data used in this case study were derived from 3-month in situ measurements carried out using three directional buoys that have been deployed simultaneously – yet independently (various buoy types and water depths) – on the Atlantic coast in the neighbourhood of Figueira da Foz. Two ways of reporting the statistics were adopted. In the first one, each recorded sea state was summarized as a set of global parameters accounting for energy, mean frequency and direction, spectral bandwidth and directional spreading related to the main ongoing wave field considered as unimodal. In the second one, each sea state has been decomposed into...
Tipo: Text Palavras-chave: Sea state; Directional spectrum; Wave systems; Spectrum partitioning; Spectral bandwidth; Directional spreading.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00037/14813/12196.pdf
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Resource Assessment for Cornwall, Isles of Scilly and PNMI. Task 1.2 of WP3 from the MERiFIC Project. ArchiMer
Smith, Helen; Maisondieu, Christophe; Van Nieuwkoop, Joana; Boufferouk, Abdessalem.
This report provides an overview of resource assessment techniques for marine energy developments and the requirements at different stages of project development. It then details the studies that have been completed in Cornwall and the Isles of Scilly (Section 3) and Finistère and PNMI (Section 4). These studies combine shorter-term in situ measurements, using a range of measurement technologies, and numerical modelling to provide long-term and geographically diverse records.
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00203/31442/29839.pdf
Registros recuperados: 28
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