Browse

Here we show how a lattice Boltzmann based approach accurately model acoustic wave propagation in strongly heterogeneous media. Rather than solving a partial-differential wave equation in a continuous medium, the lattice-Boltzmann based method directly simulates the physical processes of wave propagation: transportation, reflection and transmission. It can accurately handle sharp interfaces at any locations along lattice links, and total reflections from free surfaces or empty bubbles. I used empty and nonempty bu...

In this article we investigated a practical case history to define and show the differences of sand and gravel in side scan sonar images. The images were obtained by the Yellow- Fin side scan sonar instrument and processed with related software. The sound transmitted by the DSL-120 kHz instrument travels to the seafloor, bounces off of the seafloor, returns to the instrument, and is recorded. The strength of the sound recorded by the side-scan sonar instrument converted to shades of gray. A very strong return is w...