Sediment acoustics: Reduced parameter model and sediment property inversion
Abstract
Three main tasks are proposed: (1) A new concept to extend the Biot model to muds is put forward, in which the boundary between th"e skeletal frame and the pore fluid will be redefined. In the case of clean sand, the division between the solid frame and the pore fluid is very clear -the solid grains are mechanically held together to form a skeletal frame through which the pore fluid flows. In the case of mud, the skeletal frame needs to be redefined, because a significant fraction of the pore fluid is attached to the solid platelets by electrostatic forces. Multiple platelets, along with the attached water, are connected together to form relatively rigid domains.They are connected together in a ~floc~, which may be considered as the skeletal frame in the context of a porous medium. (2) The current US-UK joint project on seabed characterization addresses the inversion of the reflection loss (magnitude), and the work proposed here will make use of the phase of the reflection coefficient to augment inversion process. (3) The sound paths n the CAATEX experiment will be modeled, in particular, the propagation of sound over the seabed and ridges under the arctic ice. This w"ill complement the current plans, which do not contain any component for seabed modeling.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 09, 2020
- Source ID
- N000142012041
Entities
People
- Nicholas Chotiros
Organizations
- Office of Naval Research
- United States Navy
- University of Texas at Austin