Sediment-Generated Noise and Bed Stress in a Tidal Channel

Journal Article

Title: Sediment-Generated Noise and Bed Stress in a Tidal Channel
Publication Date:
April 01, 2013
Journal: Journal of Geophysical Research
Volume: 118
Issue: 4
Pages: 2249-2265
Publisher: AGU Publications
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Document Access

Website: External Link

Citation

Bassett, C.; Thomson, J.; Polagye, B. (2013). Sediment-Generated Noise and Bed Stress in a Tidal Channel. Journal of Geophysical Research, 118(4), 2249-2265.
Abstract: 

Tidally driven currents and bed stresses can result in noise generated by moving sediments. At a site in Admiralty Inlet, Puget Sound, Washington State (USA), peak bed stresses exceed 20 Pa. Significant increases in noise levels are attributed to mobilized sediments at frequencies from 4–30 kHz with more modest increases noted from 1–4 kHz. Sediment-generated noise during strong currents masks background noise from other sources, including vessel traffic. Inversions of the acoustic spectra for equivalent grain sizes are consistent with qualitative data of the seabed composition. Bed stress calculations using log layer, Reynolds stress, and inertial dissipation techniques generally agree well and are used to estimate the shear stresses at which noise levels increase for different grain sizes. Regressions of the acoustic intensity versus near-bed hydrodynamic power demonstrate that noise levels are highly predictable above a critical threshold despite the scatter introduced by the localized nature of mobilization events.

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