Abstract
In May of 2012, three weeks of ambient noise measurements from a hydrophone buried 30 cm deep in the sediment were recorded at Advocate Beach, a 1:10 sloped beach at the head of the Bay of Fundy, Nova Scotia. While tides varied the mean water depth between 0 and 4 m, 0.8 m surface waves passed overhead, driving sediment bedload transport and creating an ambient noise field in the sediment consisting of two primary components: noise generated by bubbles formed in breaking waves at the surface and noise generated by the collisions of sand, gravel and cobble in the bedload transport along the seabed. Both of these noise sources are stochastic and can be described by their second order statistics: power spectral density, spatial coherence and directional density. In an effort to distinguish these two noise sources, the spatial properties of three full wave models of the noise field in the sediment are compared, using an infinite sheet of sources placed near the surface of a Pekeris waveguide to model breaking wave noise, near the fluid-fluid interface of a Pekeris waveguide to model bedload transport noise, or near the fluid-fluid interface of two infinite half-spaces to model bedload transport noise.
| Original language | English |
|---|---|
| Article number | 005002 |
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Proceedings of Meetings on Acoustics |
| Volume | 19 |
| Issue number | 1 |
| Early online date | 14 May 2013 |
| DOIs | |
| Publication status | Published - 2 Jun 2013 |
| Externally published | Yes |
| Event | 21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada Duration: 2 Jun 2013 → 7 Jun 2013 |