Numerical Assessment on Wave Energy Resources in Coastal Waters of Northeastern Taiwan

2014 ◽  
Author(s):  
Shiaw-Yih Tzang ◽  
Yung-Lung Chen ◽  
Tai-Wen Hsu ◽  
Da-Wei Chen ◽  
Chun-Chih Wang ◽  
...  
Keyword(s):  
Wave Energy ◽  
Coastal Waters ◽  
Model Simulation ◽  
Surface Wind ◽  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Test Site ◽  
Energy Resources ◽  
Marine Energy ◽  
Current Profiler

To assess wave power resources at a marine energy test site in Keelung coastal waters, the SWAN (Simulating WAve Nearshore) model [1; 2] is applied to obtain wave conditions for assessing the wave energy resources. The ocean surface wind velocity by CCMP (Cross-Calibrated Mutli-Platform) is first adopted in SWAN model simulation. Comparisons with field measurements of AWCP (Acoustic Water Column Profiler) station in Port of Keelung and of ADCP (Acoustic Doppler Current Profiler) station offshore NTOU (National Taiwan Ocean University) during periods form Jul 1st to Dec 31st of 2010, show that simulated significant wave heights agree well with measured values except in periods of typhoons and strong northeastern monsoons. However, the simulated peak periods are generally underestimated than the measurements. The same results can also be seen in simulated wave energies. The resulting simulated wave energies agree with measurements better at NTOU test site than at Keelung station.

Peakedness of Wave Systems Observed on the French Wave Energy Test Site (SEM-REV) Using a Spectral Partitioning Algorithm

2013 ◽  
Author(s):  
Jean-Baptiste Saulnier ◽  
Izan Le Crom
Keyword(s):  
Wave Energy ◽  
Test Site ◽  
Extreme Conditions ◽  
Multiple Wave ◽  
Wave Energy Converters ◽  
Marine Energy ◽  
Partitioning Algorithm ◽  
Spectral Partitioning ◽  
The Individual ◽  
Energy Converters

Located off the Guérande peninsula, SEM-REV is the French maritime facility dedicated to the testing of wave energy converters and related components. Lead by Ecole Centrale de Nantes through the LHEEA laboratory, its aim is to promote research alongside the development of new offshore technologies. To this end, the 1km2, grid-connected zone is equipped with a comprehensive instruments network sensing met-ocean processes and especially waves, with two identical directional Waverider buoys deployed on the site since 2009. For the design of moored floating structures and, a fortiori, floating marine energy converters, the knowledge of the main wave resource — for regular operation — but also extreme conditions — for moorings and device survivability — has to be as precise as possible. Also, the consideration of the multiple wave systems (swell, wind sea) making up the sea state is a key asset for the support of developers before and during the testing phase. To this end, a spectral partitioning algorithm has been implemented which enables the individual characterisation of wave systems, in particular that of their spectral peakedness which is especially addressed in this work. Peakedness has been shown to be strongly related to the groupiness of large waves and is defined here as the standard JONSWAP’s peak enhancement factor γ. Statistics related to this quantity are derived from the measurement network, with a particular focus on the extreme conditions reported on SEM-REV (Joachim storm).

scholarly journals A NEW STRATEGIC WAVE MEASUREMENT STATION OFF NAPLES PORT MAIN BREAKWATER

2017 ◽  
pp. 36 ◽  
Author(s):  
Luca Centurioni ◽  
Lance Braasch ◽  
Enrico Di Lauro ◽  
Pasquale Contestabile ◽  
Francesco De Leo ◽  
...  
Keyword(s):  
Wave Energy ◽  
Low Cost ◽  
Acoustic Doppler Current Profiler ◽  
Wave Spectra ◽  
Sea State ◽  
Gulf Of Naples ◽  
Current Profiler ◽  
Directional Wave ◽  
Low Costs ◽  
Good Agreement

The accuracy of directional wave spectra sensors is crucial for obtaining accurate forecasts of ocean and coastal wave conditions for scientific and engineering applications. In this paper, a newly designed, low-cost GPS-based wave buoy, called the Directional Wave Spectra Drifter (DWSD), is presented. A field test campaign was conducted at the Gulf of Naples, Italy with the goal of comparing the directional wave properties obtained with the DWSD and with a nearly co-located bottom-mounted Acoustic Doppler Current Profiler (ADCP) from Teledyne RD-Instruments. The comparison shows a very good agreement between the two methodologies. The reliability of this innovative instrument and its low costs allow a large variety of applications, including the implementation of a global, satellite-linked, real-time open-ocean network of drifting directional wave spectra sensors and monitoring the sea-state in harbors to aid ship transit and for planning coastal and offshore constructions. The DWSD is currently in use to better constrain the wave energy climatology with the goal of optimizing the design of a full-scale prototype Wave Energy Converter (WEC) in the port of Naples, Italy.

Hebridean Marine Energy Resources: Wave-Power Characterisation Using a Buoy Network

2012 ◽  
Author(s):  
Arne Vögler ◽  
Vengatesan Venugopal
Keyword(s):  
Wave Energy ◽  
Site Selection ◽  
Selection Process ◽  
Energy Resource ◽  
Energy Resources ◽  
Wave Power ◽  
Energy Futures ◽  
Wave Energy Converters ◽  
Marine Energy ◽  
Outer Hebrides

The Outer Hebrides of Scotland were identified as an area with a high wave power resource of 42.4kW/m. The Outer Hebrides of Scotland are currently targeted by a range of developers for demonstration and commercial developments of wave energy converters and current planning efforts are based on initial deployments by 2014. Technology providers with well advanced plans to develop the Hebridean wave resource include Aquamarine Power (Oyster) [1], Pelamis (P2) [2] and Voith Wavegen (OWC) [3]; all of these companies are partners in the Hebridean Marine Energy Futures project [4] to help move the industry into the commercialisation stage. As part of the Hebridean Marine Energy Futures project, a three year programme aimed at developing a high resolution wave energy resource map to support the site selection process of marine energy developers, a network of three wave measuring buoys was deployed 15km offshore in a depth of 60m and at distances of 11km between buoys. Measured wind and wave data from this buoy network for autumn 2011 are analysed and presented in this paper along with estimated wave power for the same duration.

scholarly journals A Study of the Location of the Entrance of a Fishway in a Regulated River with CFD and ADCP

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Anders G. Andersson ◽  
Dan-Erik Lindberg ◽  
Elianne M. Lindmark ◽  
Kjell Leonardsson ◽  
Patrik Andreasson ◽  
...  
Keyword(s):  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Fish Passage ◽  
Hydropower Plant ◽  
Regulated River ◽  
Unstable Flow ◽  
River Bed ◽  
Current Profiler ◽  
Tailrace Tunnel ◽  
Made In

Simulation-driven design with computational fluid dynamics has been used to evaluate the flow downstream of a hydropower plant with regards to upstream migrating fish. Field measurements with an Acoustic Doppler Current Profiler were performed, and the measurements were used to validate the simulations. The measurements indicate a more unstable flow than the simulations, and the tailrace jet from the turbines is stronger in the simulations. A fishway entrance was included in the simulations, and the subsequent attraction water was evaluated for two positions and two angles of the entrance at different turbine discharges. Results show that both positions are viable and that a position where the flow from the fishway does not have to compete with the flow from the power plant will generate superior attraction water. Simulations were also performed for further downstream where the flow from the turbines meets the old river bed which is the current fish passage for upstream migrating fish. A modification of the old river bed was made in the model as one scenario to generate better attraction water. This considerably increases the attraction water although it cannot compete with the flow from the tailrace tunnel.

scholarly journals Numerical investigation on the impact of wind-induced hydraulics on dissolved oxygen characteristics in a shallow stormwater pond

2019 ◽  
Vol 54 (4) ◽  
pp. 309-325 ◽  
Author(s):  
Liyu Chen ◽  
Patrick M. D'Aoust ◽  
Colin D. Rennie ◽  
Alexandre Poulain ◽  
Frances Pick ◽  
...  
Keyword(s):  
Water Quality ◽  
Wind Speed ◽  
Dissolved Oxygen ◽  
Surface Wind ◽  
Acoustic Doppler Current Profiler ◽  
Low Flow ◽  
Water Quality Control ◽  
Current Profiler ◽  
Wind Driven Currents ◽  
The Impact

Abstract Stormwater ponds (SWPs) are widely utilized for flood and water quality control. Low-flow rates are common in SWPs, sometimes causing wind-driven currents to become the dominant hydrodynamic force during ice-free periods. Hence, it is essential to understand the influence of the wind-induced flow on stratification and dissolved oxygen (DO) concentrations in shallow SWPs to predict the performance and water quality of these systems. The objective of this study is to evaluate the influence of wind-driven circulation on the spatial distribution of DO in an SWP using a numerical model. A bottom-mounted acoustic Doppler current profiler (ADCP) was utilized to measure small wind-induced currents and to validate a hydrodynamic model, which suggested that a wind-dominated circulation was generated even with the moderate wind speed. Countercurrents opposite in the direction to surface wind-generated flow were also present. The DO model demonstrated that complete mixing can be produced by higher wind speed, leading to fully oxic conditions throughout the water column (7.00 mg/L DO or higher), wherein low DO water at depth was carried to the surface by upwelling circulation and was possibly replenished during the surface transportation. This sheds some light on the impact of wind-induced mixing on the water quality in shallow SWPs.

scholarly journals A Detailed Assessment of the Wave Energy Resource at the Atlantic Marine Energy Test Site

Energies ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 967 ◽  
Author(s):  
Reduan Atan ◽  
Jamie Goggins ◽  
Stephen Nash
Keyword(s):  
Wave Energy ◽  
Energy Resource ◽  
Test Site ◽  
Marine Energy ◽  
Detailed Assessment

Amplifikasi pasang surut dan dampaknya terhadap Perairan Probolinggo

2016 ◽  
Vol 1 (3) ◽  
pp. 69
Author(s):  
Muhammad Hasanudin ◽  
Edi Kusmanto ◽  
Wahyu Budisetyawan
Keyword(s):  
Coastal Waters ◽  
Power Spectra ◽  
Acoustic Doppler Current Profiler ◽  
Tidal Flats ◽  
Tidal Range ◽  
Interesting Phenomenon ◽  
Natural Period ◽  
Port Area ◽  
Tidal Amplification ◽  
Current Profiler

<strong>Tidal Amplification and Its Impact to Probolinggo Coastal Waters.</strong> Rob flood that frequently struck the coast of Probolinggo is an interesting phenomenon. Tidal flood, tidal flats, and sedimentation is strongly associated with the tides. Therefore, this study of tidal amplification and its estimated impacts on the coastal waters of Probolinggo was conducted. Tidal measurements were done with RBR TWR-2050 every 5 minutes for 30 days. Measurements of flow and depth were performed with the Acoustic Doppler Current Profiler (ADCP) 1200 KHz along the trajectory of the boat. Measurements of turbidity with turbiditymeter mounted on a CTD SBE 19 Plus at 19 stations. The results showed that tidal range reached 3.00 m, much higher than in Java Sea. As a comparison, the tidal range of Tanjung Perak port in Surabaya was 1.76 m. Based on the value of Formzahl (0.85) and analysis of power spectra, Probolinggo waters were classified as mixed tide prevailing semidiurnal. There was indication of tidal amplification due to resonance of natural period of Madura Strait for 12.46 hours on M2 tidal constituent with a period of 12.42 hours that caused the tidal amplitude of Probolinggo waters reached 3 m. Impact of such amplification included the current direction which always leads to the coast, both at high and low tides that resulted in relatively high distribution of suspended sediment along the coast and around the port area. Intensive sedimentation caused the flatness and vast formation of tidal flats, up to 3 km from the coastline. Moreover, the phenomenon of tidal amplification impacted on the tidal inundation in the lower mainland when the tidal amplification occured simultaneously with the intense rain which caused the tidal flood in the coastal villages of Probolinggo.<br /><br />

Hydropower Intake-induced Fish Entrainment Risk Zone Analysis

2020 ◽  
Author(s):  
Mat Langford ◽  
David Z. Zhu ◽  
Alf Leake ◽  
Steven Cooke
Keyword(s):  
Potential Flow ◽  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Dynamics Model ◽  
Risk Zone ◽  
Operational Conditions ◽  
Environmentally Sustainable ◽  
Computational Fluid Dynamics Model ◽  
Flow Solution ◽  
Current Profiler

Evaluating the impacts of hydropower intake operations on upstream aquatic habitat is important for the development of environmentally sustainable hydropower and flood protection. A computational fluid dynamics model was used to simulate the flow field in the forebay of a high dam, Mica Dam in British Columbia, Canada. The model use to evaluate the upstream hydraulics under various operational conditions and reservoir levels. This model, which was verified by a novel means of collected acoustic Doppler current profiler field measurements, highlights how appropriate intake selection may limit the volume of the forebay occupied by the entrainment risk zone. Additionally, a potential flow solution was applied to predict the velocity field induced by the intakes and the limitation of the potential flow solution was assessed.

scholarly journals Removing Wave Bias from Velocity Measurements for Tracer Transport: The Harmonic Analysis Approach

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1138 ◽  
Author(s):  
Sangdon So ◽  
Arnoldo Valle-Levinson ◽  
Jorge Armando Laurel-Castillo ◽  
Junyong Ahn ◽  
Mohammad Al-Khaldi
Keyword(s):  
Harmonic Analysis ◽  
Gravity Wave ◽  
Wave Energy ◽  
Acoustic Doppler Current Profiler ◽  
Surface Gravity ◽  
Tracer Transport ◽  
Velocity Measurements ◽  
Surface Gravity Wave ◽  
Current Profiler ◽  
Adcp Measurements

Estimates of turbulence properties with Acoustic Doppler Current Profiler (ADCP) measurements can be muddled by the influence of wave orbital velocities. Previous methods—Variance Fit, Vertical Adaptive Filtering (VAF), and Cospectra Fit (CF)—have tried to eliminate wave-induced contamination. However, those methods may not perform well in relatively energetic surface gravity wave or internal wave conditions. The Harmonic Analysis (HA) method proposed here uses power spectral density to identify waves and least squares fits to reconstruct the identified wave signals in current velocity measurements. Then, those reconstructed wave signals are eliminated from the original measurements. Datasets from the northeastern Gulf of Mexico and Cape Canaveral, Florida, are used to test this approach and compare it with the VAF method. Reynolds stress estimates from the HA method agree with the VAF method in the lower half of the water column because wave energy decays with depth. The HA method performs better than the VAF method near the surface during pulses of increased surface gravity wave energy.

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