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Design diagrams for wavelength discrepancy in tank testing with inconsistently scaled intermediate water depth


Citation Noble, D.R., Draycott, S., Davey, T.A.D. and Bruce, T. Design diagrams for wavelength discrepancy in tank testing with inconsistently scaled intermediate water depth, International Journal of Marine Energy, 18: 109-113, 2017. https://doi.org/10.1115/OMAE2017-62052.
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Author(s) Noble, D.R., Draycott, S., Davey, T.A.D. and Bruce, T.
Project partner(s) FloWave Ocean Energy Research Facility, The University of Edinburgh
Publisher International Journal of Marine Energy, 18: 109-113
DOI https://doi.org/10.1115/OMAE2017-62052
Abstract The well-known dispersion relation links the length and period of a water wave with the depth in which it propagates. When model testing in tanks, the water depth should be consistently scaled to correctly replicate the waves. While this is done routinely by scaling foreshore bathymetry in coastal engineering physical model studies, and is not significant for deep water scenarios, this is not always considered when testing marine renewable energy devices, which are often in intermediate depth. Where water depth is not scaled consistently there will be resulting errors in wave parameters including wavelength, steepness, celerity, group velocity, and power. Design diagrams are presented to quantify and visualise these discrepancies over a typical range for testing offshore renewable energy devices. This design tool will facilitate experimental planning, quantification of uncertainties, and correlation of model test results with field data.

Highlights
  • Wave parameter errors described for tank tests with inconsistently scaled water depth.
  • Potential errors include wavelength, steepness, celerity, group velocity, and power.
  • Design diagrams are presented to quantify and visualise these discrepancies.
  • This will facilitate experimental planning, particularly in intermediate depth water
This work was partly funded via IDCORE, the Industrial Doctorate Centre for Offshore Renewable Energy, which trains research engineers whose work in conjunction with sponsoring companies aims to accelerate the deployment of offshore wind, wave and tidal-current technologies
Associated Project(s) ETI-MA2003: Industrial Doctorate Centre for Offshore Renewable Energy (IDCORE)
Associated Dataset(s) EDC0000134: Tidal Energy Site Environmental Conditions Measured During the ReDAPT Tidal Project 2011-2014
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