Poroelastic Properties for Modeling the Water-Sediment Interface in the Northeastern South China Sea
Abstract
The transmission of underwater sound and its interactions with the sediment layer of the ocean floor has impacts across many areas of naval warfare. There are numerous physical parameters influencing acoustics at the water-sediment interface. A numerical modeling approach, using the equation of motion from Biot's theory of poroelasticity is useful in determining if variations in the physical parameters will have implications on acoustic reflections, transmissions, and bottom loss. These modeling efforts can inform decisions related to antisubmarine warfare, mine warfare, and hydrography as well as other areas of U.S. naval operations. This thesis examined variations in characteristic pore size, dynamic viscosity, permeability, and porosity and assessed the impacts of these variations on the acoustic reflection and transmission coefficients and bottom loss at the water-sediment interface. Our analyses determined that porosity and characteristic pore size, individually, had the largest impacts on the acoustical transmissions within the water-sediment interface for the parameters studied. Future research is suggested to study the interrelationships of these modeled physical parameters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2020
- Accession Number
- AD1114181
Entities
People
- Laura-michel Dehaan
Organizations
- Naval Postgraduate School