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Title: Measurements of Turbulence at Two Tidal Energy Sites in Puget Sound, WA

Field measurements of turbulence are pre- sented from two sites in Puget Sound, WA (USA) that are proposed for electrical power generation using tidal current turbines. Rapidly sampled data from multiple acoustic Doppler instruments are analyzed to obtain statistical mea- sures of fluctuations in both the magnitude and direction of the tidal currents. The resulting turbulence intensities (i.e., the turbulent velocity fluctuations normalized by the harmonic tidal currents) are typically 10% at the hub- heights (i.e., the relevant depth bin) of the proposed turbines. Length and time scales of the turbulence are also analyzed. Large-scale, anisotropic eddies dominate the energy spectra, which may be the result of proximity to headlands at each site. At small scales, an isotropic turbulent cascade is observed and used to estimate the dissipation rate of turbulent kinetic energy. Data quality and sampling parameters are discussed, with an emphasis on the removal of Doppler noise from turbulence statistics.
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Publication Date:
OSTI Identifier:
Report Number(s):
EB4500000; TRN: US201216%%256
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Journal of Oceanic Engineering; Journal Volume: 37; Journal Issue: 3
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
Country of Publication:
United States
16 TIDAL AND WAVE POWER; ACOUSTICS; CYSTEAMINE; DATA; DEPTH; ENERGY; ENERGY SPECTRA; FLUCTUATIONS; HARMONICS; KINETIC ENERGY; LENGTH; NOISE; POWER GENERATION; PUGET SOUND; REMOVAL; SAMPLING; STATISTICS; TURBINES; TURBULENCE; USA; VELOCITY; Tidal energy; tidal power; marine and hydrokinetic energy; turbulence; turbulent intensity; Acoustic Doppler Current Profiler (ADCP); Acoustic Doppler Velocimeter (ADV)