Seabed characterization experiment 2017: Development of Linear Inverse Methods
Abstract
A seabed characterization experiment was conducted during March 2017 in an area off Martha~s Vineyard in the New England continenta"l shelf. The seabed in this experimental area is covered by a thick layer of mud like sediment followed by a layer of sand and subsequent deeper sediment layers. The seabed acoustic properties influence the performance of ship~s sonar system and hence knowledge of the sediment acoustic properties is critical for naval operation. One of the objectives of the experiment was to estimate the range dependent sediment acoustic properties from the acoustic data collected during the experiment. The experiment consisted of deploying explosive charges that created broadband signals. The charges were deployed at over 30 locations and the signals were collected at different vertical and horizontal arrays deployed in the experimental area. In this proposal, data collected at the hydrophones in the vertical array will be analyzed and the mode dispersion curve for various modes extracted. The mode dispersion data thus obtained will be the input to an inversion algorithm to estimate the compressional wave speed and density of the sediment layers. A scheme for estimating the number of layers and the layer thicknesses will be developed. The inversion method will be based on linear inverse procedure, a method that has been successfully employed in the analysis of other field experiment data for estimation of sediment" acoustic properties.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 24, 2019
- Source ID
- N000141912193
Entities
People
- Subramanian Rajan
Organizations
- Office of Naval Research
- United States Navy