TY - JOUR
TI - Sediment-Generated Noise and Bed Stress in a Tidal Channel
AU - Bassett, C
AU - Thomson, J
AU - Polagye, B
T2 - Journal of Geophysical Research
AB - 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.
DA - 2013/04//
PY - 2013
VL - 118
IS - 4
SP - 2249
EP - 2265
UR - https://onlinelibrary.wiley.com/doi/10.1002/jgrc.20169/abstract
DO - 10.1002/jgrc.20169
LA - English
KW - Marine Energy
KW - Tidal
KW - Changes in Flow
KW - Noise
ER -