High Frequency Acoustic Reflection and Transmission in Ocean Sediments
نویسندگان
چکیده
Task 1: In this effort, we developed a model of acoustic wave interaction with sand grains that included partitioning of wave energy into the rotational degrees of freedom of the sand grain. This model provides a physical explanation of the low frequency sound speeds measured at SAX99 and SAX04 which were found to be significantly below the Wood’s equation prediction. This effort was led by Nicholas Chotiros and Marcia Isakson (ARL:UT).
منابع مشابه
Determination of sediments diameter using acoustic waves
The use of acoustic waves in researches related to sea water is of most importance among scientists recently. Since these waves are the only waves, transmitted in water with lowest attenuation and high speed, they can be used in many scientific fields. The main goal of this research is to better understand the physics and mechanisms of sound-seabed interaction, including acoustic penetration, p...
متن کاملLow Frequency Bottom Reflectivity from Reflection
Ocean bottom reflectivity has been studied for a simple layered sedimentary model at shallow depth. Reflections from the bottom were determined from standard geophysical reflection data. The plane wave reflections have been obtained as bottom loss (-20log|R|) from the available reflection seismic data. Bottom loss estimated in the 10-250 Hz band are presented as functions of frequency and of an...
متن کاملHigh-Frequency Sound Interaction in Ocean Sediments: Modeling Environmental Controls
Our long term goal is to develop accurate models for high-frequency acoustic penetration into, propagation within, and scattering from shallow water ocean sediments. This work should specifically improve the Navy’s ability to detect buried mines and, in general, improve sonar performance in shallow water. Additional objectives of the NRL program are to understand and model the complex interacti...
متن کاملEvaluation of underwater acoustic propagation model (Ray theory) in a river using Fluvial Acoustic Tomography System
Underwater acoustics is widely used in many applications, such as oceanography, marine biology, hydrography, fishery, etc. Different models are introduced to simulate the underwater acoustic propagation in the oceans and the seas. In this study, the Ray Theory model is used to simulate the acoustic wave propagation in a shallow-freshwater river (Gono River) located in western part of Japan. The...
متن کاملHigh-Frequency Acoustics of Ocean Sediments and Biot’s Theory
There were two parallel approaches to the problem. The first approach used data from the SAX99 experiment to guide the model development effort. The analysis was by Nicholas Chotiros, ARL:UT, with supporting data from numerous SAX99 participants including Eric Thorsos and the APL/UW team, Michael Richardson and the NRL team, Anthony Lyons and the SACLANTCEN team and others. The SAX99 data set w...
متن کامل