Abstract
This paper derives travel times and arrival angles of head-wave correlations from ocean ambient noise in shallow water over a layered seabed. The upcoming and surface reflected head-wave noise signal received at two receivers from the same interface are correlated, and their travel time differences give the travel times of the head-wave correlations. The arrival angle of head-wave correlations from an interface depends on sound speeds in the layers above and just below. The predictions of head-wave correlations from a seabed with two layers and the corresponding inversion results are verified with simulations.
Highlights
In shallow water with a fast homogeneous fluid half-space seabed, head waves are acoustic waves propagating in the water column at the critical angle with part of their propagation path in the sediment interface.1–4 In the water column, when the horizontal distance between source and receiver is relatively large, the head-wave arrival can precede other water-borne arrivals due to the greater sound speed at the bottom
The arrival angle of head-wave correlations from an interface depends on sound speeds in the layers above and just below
This paper studies the travel times and angles of arrival of head-wave correlations in an ocean waveguide with a layered seabed based on theory and modeling
Summary
In shallow water with a fast homogeneous fluid half-space seabed, head waves are acoustic waves propagating in the water column at the critical angle with part of their propagation path in the sediment interface. In the water column, when the horizontal distance between source and receiver is relatively large, the head-wave arrival can precede other water-borne arrivals due to the greater sound speed at the bottom. The head-wave correlations from a layered seabed have been observed in simulation using controlled sources distributed near the sea surface and a horizontal receiving array.. The head-wave correlations from a layered seabed have been observed in simulation using controlled sources distributed near the sea surface and a horizontal receiving array.17 They appear as a sequence of signals in time at some specific angles. This paper studies the travel times and angles of arrival of head-wave correlations in an ocean waveguide with a layered seabed based on theory and modeling. The travel times and angles of arrival of head-wave correlations will be combined to invert for sound speeds and layer thicknesses in the water and seabed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
