Showing papers on "Wave power published in 2016"
TL;DR: In this article, wave hindcast is exploited to update existing assessments of wave energy potential in the Mediterranean Sea, covering the period 1979-2013, with calibrated source-term parameters recently proposed by L. Mentaschi et al. (2015).
132 citations
TL;DR: In this paper, an evaluation of the efficiency of twelve state-of-the-art wave energy converters in the Atlantic Ocean, in the vicinity of the most important European islands and archipelagos (Iceland, Archipelago of Azores, Madeira archipelago and Canary Islands), was performed by considering a 10-year interval (2004-2013) of wave data provided by the European Centre for Medium-Range Weather Forecasts.
109 citations
TL;DR: In this paper, a long-term assessment of the wave energy resource potential for the Australian southeast shelf is performed from deep to shallow water, based on a 31-year wave hindcast.
82 citations
TL;DR: In this article, the influence of bottom profile configuration in the oscillating water column (OWC) on its hydrodynamic performance was studied in terms of wave amplification factor, wave power absorption coefficient, hydrodynamics efficiency, lip wall pressure ratio, and air pressure ratio.
77 citations
TL;DR: In this article, the authors compared the performance of the spar torus combination (STC) and the semi-submersible flap combination (SFC) with a wind turbine at a 1:50 scale under simultaneous wave and wind excitation.
67 citations
TL;DR: In this paper, a fully coupled, wave-to-wire time-domain model that can simulate the hydrodynamic, mechanical, and electrical response of an array of wave energy converters is presented.
Abstract: This paper describes a fully coupled, wave-to-wire time-domain model that can simulate the hydrodynamic, mechanical, and electrical response of an array of wave energy converters. Arrays of any configuration can be simulated to explore both the effects of the array on the electricity network and of network events on the devices within the array. State-space modeling of the hydrodynamic radiation forces enables fast and accurate prediction of the interacting response of multiple devices, including the effects of wave climate, control strategies, and network power flow. Case studies include the demonstration of the bidirectional interaction of the array and the network.
67 citations
TL;DR: In this article, an experimental study of the survivability of the offshore combined concept Semisubmersible wind energy and Flap-type wave energy Converter (SFC) and with comparisons of the experimental data with numerical predictions is conducted on an 1:50 scale physical model.
63 citations
TL;DR: In this paper, the wave energy resource along the Atlantic coast of Morocco using a 44-year series of data obtained from numerical modeling (hindcasting) is analyzed using data from 23 points along that coast.
58 citations
TL;DR: In this paper, the hydrodynamic analysis of an array of oscillating water column (OWC) devices that is floating independently in finite depth waters and exposed to the action of regular surface waves is assumed.
57 citations
TL;DR: In this article, the spatial distribution of mean monthly and annual averaged significant wave height and wave power flux in the Bohai Sea is presented. And the correlations between significant wave heights and wave energy period are studied in scatter and energy diagrams.
54 citations
TL;DR: In this article, the authors proposed a spar torus combination (STC) concept, which is a combined wind and wave energy converter concept that is composed of a spar floating wind turbine and a torus-shaped, heaving-body wave Energy Converter (WEC).
TL;DR: In this article, a two-heaving body model (sparbuoy and OWC) based on linear forces is formulated in the frequency domain, where the presence of the channel side walls is simulated approximately by a periodic array of devices, and alternatively by two finite-length walls.
TL;DR: In this article, observations of winds, waves, and turbulence at the ocean surface are compared with several analytic formulations and a numerical model for the input of turbulent kinetic energy by wave breaking and the subsequent dissipation.
Abstract: Observations of winds, waves, and turbulence at the ocean surface are compared with several analytic formulations and a numerical model for the input of turbulent kinetic energy by wave breaking and the subsequent dissipation. The observations are generally consistent with all of the formulations, although some differences are notable at winds greater than 15 m s−1. The depth dependence of the turbulent dissipation rate beneath the waves is fit to a decay scale, which is sensitive to the choice of vertical reference frame. In the surface-following reference frame, the strongest turbulence is isolated within a shallow region of depths much less than one significant wave height. In a fixed reference frame, the strong turbulence penetrates to depths that are at least half of the significant wave height. This occurs because the turbulence of individual breakers persists longer than the dominant period of the waves and thus the strong surface turbulence is carried from crest to trough with the wave orb...
TL;DR: In this article, an improved wave energy potential estimate has been made based on various parameters such as physical site characteristics, environmental conditions and socio-economic regional state, the selection criteria have been suggested.
TL;DR: In this article, the wave energy potential and its spatial and temporal variations in the southern Caspian Sea were evaluated and it was concluded that the central station is the most appropriate location for wave energy harvesting.
TL;DR: In this paper, a 1:8 scaled prototype of the wave energy converter (WEC) is presented, a device able to harvest sea energy exploiting the inertial effect of a gyroscope.
TL;DR: In this article, wave power atlas is generated for the Aegean Sea for years from 1999 to 2013 using a third-generation spectral wave model MIKE 21 SW, which was then interpolated to 10-min interval data.
TL;DR: In this article, a case study of wind and wave co-located farms with the aim of assessing their benefits relative to standalone wind farms is presented, and it is found that the energy yield per unit area with the combined wave-wind farm increases by 3.4% relative to a standalone wind farm, the downtime periods decrease by 58% and the power output variability reduces by 12.5%.
TL;DR: In this article, the wave energy at five coastal stations in the Gulf of Oman using the time series of locally generated wind waves obtained by numerical modeling for 11 years was investigated. And the spatial, seasonal, monthly, directional, inter-annual of wave energy and power were investigated, showing that the wave power increases towards the Indian Ocean and the highest mean wave power is located at the eastern station in all seasons.
TL;DR: In this article, a high-power integrated generation unit for offshore wind power and ocean wave energy (W2P) was presented, which includes a wind wheel with retractable blades and the 3-DOF (degrees of freedom) mechanism with the hemispherical oscillating body.
TL;DR: In this article, the authors evaluate the accuracy of probabilistic forecasts of wave energy flux from a variety of methods, including unconditional and conditional kernel density estimation, univariate and bivariate autoregressive moving average generalised auto-gressive conditional heteroskedasticity (ARMA-GARCH) models, and a regression-based method.
TL;DR: In this article, a detailed Simulating WAves Nearshore (SWAN) numerical wave propagation model was developed to quantify the gross wave energy resource along the West Coast of Vancouver Island, and hence the feasibility of deploying WEC technologies.
TL;DR: In this article, the wave normal angle from the electric and magnetic field instrument suite and Integrated Science package on board the Van Allen Probes was included in the conversion factor, thus allowing for the accuracy of these assumptions to be quantified.
Abstract: Cold plasma theory and parallel wave propagation are often assumed when approximating the whistler mode magnetic field wave power from electric field observations. The current study is the first to include the wave normal angle from the Electric and Magnetic Field Instrument Suite and Integrated Science package on board the Van Allen Probes in the conversion factor, thus allowing for the accuracy of these assumptions to be quantified. Results indicate that removing the assumption of parallel propagation does not significantly affect calculated plasmaspheric hiss wave powers. Hence, the assumption of parallel propagation is valid. For chorus waves, inclusion of the wave normal angle in the conversion factor leads to significant alterations in the distribution of wave power ratios (observed/ calculated); the percentage of overestimates decreases, the percentage of underestimates increases, and the spread of values is significantly reduced. Calculated plasmaspheric hiss wave powers are, on average, a good estimate of those observed, whereas calculated chorus wave powers are persistently and systematically underestimated. Investigation of wave power ratios (observed/calculated), as a function of frequency and plasma density, reveals a structure consistent with signal attenuation via the formation of a plasma sheath around the Electric Field and Waves spherical double probes instrument. A simple, density-dependent model is developed in order to quantify this effect of variable impedance between the electric field antenna and the plasma interface. This sheath impedance model is then demonstrated to be successful in significantly improving agreement between calculated and observed power spectra and wave powers.
TL;DR: In this paper, an analysis of arrays of heaving point absorbers in various arrangements is performed to study their performance in terms of the amount of power absorption and the power uniformity among floaters.
TL;DR: In this paper, the effects of different wind forcing reanalysis, particularly CFSR and ERA-Interim, and physics parametrizations on numerical simulations of the nearshore wave energy fluxes near Valparaiso (33°S), central Chile, were compared.
TL;DR: In this paper, the authors present an assessment of the wave resource at the Atlantic Marine Energy Test Site (AMETS) on the west coast of Ireland based on 12-years of modelled data from January 2004 to December 2015.
Abstract: Wave characteristic assessments of wave energy test sites provide a greater understanding of prevailing wave conditions and are therefore extremely important to both wave energy test site operators and clients as they can inform wave energy converter design, optimisation, deployment, operation and maintenance. This research presents an assessment of the wave resource at the Atlantic Marine Energy Test Site (AMETS) on the west coast of Ireland based on 12-years of modelled data from January 2004 to December 2015. The primary aim is to provide an assessment of annual and seasonal wave characteristics and resource variability at the two deployment berths which comprise the site. A nested model has been developed using Simulating WAves Nearshore (SWAN) to replicate wave propagations from regional to local scale with a 0.05° resolution model covering the northeast Atlantic and a 0.0027° resolution model covering AMETS. The coarse and fine models have been extensively validated against available measured data within Irish waters. 12-year model outputs from the high resolution model were analysed to determine mean and maximum conditions and operational, high and extreme event conditions for significant wave height, energy period and power. Annual and seasonal analyses are presented. The 12-year annual mean P were 68 kW/m at Berth A (BA) and 57 kW/m at Berth B (BB). The resource shows strong seasonal and annual variations and the winter mean power levels were found to be strongly correlated with the North Atlantic Oscillation (NAO).
TL;DR: In this paper, the authors presented an assessment of wave characteristics at the 1/4 scale wave energy test site in Galway Bay based on data from a waverider buoy from 2009 to 2013 and from a high frequency radar system (CODAR) from 2011 to 2013.
TL;DR: In this paper, the effects of air compressibility on the power conversion of oscillating water column (OWC) devices were investigated with a special focus on the effects on wave energy conversion.
Abstract: This paper presents an investigation on air compressibility in the air chamber and its effects on the power conversion of oscillating water column (OWC) devices. As it is well known that for practical OWC plants, their air chambers may be large enough for accommodating significant air compressibility, the “spring effect,” an effect that is frequently and simply regarded to store and release energy during the reciprocating process of a wave cycle. Its insight effects on the device's performance and power conversion, however, have not been studied in detail. This research will investigate the phenomena with a special focus on the effects of air compressibility on wave energy conversion. Air compressibility itself is a complicated nonlinear process in nature, but it can be linearised for numerical simulations under certain assumptions for frequency domain analysis. In this research work, air compressibility in the OWC devices is first linearised and further coupled with the hydrodynamics of the OWC. It is ab...
TL;DR: In this paper, a modified gamma spectrum is used to estimate the wave energy resources in a given deployment site, which is based on the calibration of two variables relating to the spectral width parameter and spectral peakedness parameter.
Abstract: In order to correctly predict and evaluate the response of wave energy converters (WECs), an accurate representation of wave climate resource is crucial. This paper gives an overview of wave resource modeling techniques and applies a methodology to estimate the naturally available and technically recoverable resource in a given deployment site. The methodology was initially developed by the Electric Power Research Institute (EPRI), which uses a modified gamma spectrum to interpret sea state hindcast parameter data produced by National Oceanic and Atmospheric Administration’s (NOAA’s) WaveWatch III. This gamma spectrum is dependent on the calibration of two variables relating to the spectral width parameter and spectral peakedness parameter. In this study, this methodology was revised by the authors to increase its accuracy in formulating wavelength. The revised methodology shows how to assess a given geographic area’s wave resource based on its wave power density and total annual wave energy flux.
TL;DR: In this paper, a combinedoscillating-buoy-based wave energy convertor (WEC) is proposed as an array-type WEC to exploit the conditions in East Asia, a 10kW pilot device confirmed the feasibility of its buoy array and hydraulic pressure system (HPS) for wave-energy conversion.