Empirical Green's functions are obtained for 31 paths in a highly dynamic coastal ocean by cross-correlation of ambient and shipping noise recorded in the Shallow Water 2006 experiment on a horizontal line array and a single hydrophone about 3600 m from the array. Using time warping, group speeds of three low-order normal modes are passively measured in the 10-110 Hz frequency band and inverted for geoacoustic parameters of the seabed. It is demonstrated that, despite very strong sound speed variations caused by nonlinear internal waves, noise interferometry can be successfully used to acoustically characterize the seafloor on a continental shelf.
Bibliographical noteFunding Information:
The data used in this study were collected by the Woods Hole Oceanographic Institution. The authors are grateful to A. E. Newhall for facilitating access to the data and to M. S. Ballard, J. Bonnel, M. G. Brown, N. R. Chapman, and S. E. Dosso for the benefit of our discussions. This work was supported by the National Science Foundation Grant No. OCE1657430, Binational Science Foundation Grant No. 2016545, and the Office of Naval Research Award Nos. N00014-18-WX01725 and N00014-19-WX00462.
© 2020 U.S. Government.
ASJC Scopus subject areas
- Arts and Humanities (miscellaneous)
- Acoustics and Ultrasonics