An Experiment in High-Frequency Sediment Acoustics: SAX99
نویسندگان
چکیده
A major high-frequency sediment acoustics experiment was conducted in shallow waters of the northeastern Gulf of Mexico. The experiment addressed high-frequency acoustic backscattering from the seafloor, acoustic penetration into the seafloor, and acoustic propagation within the seafloor. Extensive in situ measurements were made of the sediment geophysical properties and of the biological and hydrodynamic processes affecting the environment. An overview is given of the measurement program. Initial results from APL-UW acoustic measurements and modelling are then described.
منابع مشابه
High-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 کاملAcoustic Propagation and Scattering within Sand Sediments: Laboratory Experiments, modeling based on porous media theory, and comparisons to SAX99 results
As part of the Sediment Acoustics Experiment 1999 (SAX99) several researchers measured sound speed and attenuation. Those sound speed and attenuation results have been compared to the frequency dependence predicted by Biot theory. The comparisons indicate that the variation of sound speed with frequency is well modeled by Biot theory as frequency increases, but the variation of attenuation with...
متن کاملDiscrete Scattering in Marine Sediments
Testing various models and mechanisms of high frequency seabed scattering was one of primary goals of recent major experiments in sediment acoustics, SAX99 and SAX04, conducted near Ft. Walton Beach, Florida [1-4]. The models to test were based on various assumptions about dominance of certain scattering mechanisms and corresponding theories of scattering. Such models, confirmed by experiments,...
متن کاملGeoacoustic Modeling: High-Frequency Scattering from Heterogeneous Rough Sea Beds at Shallow Grazing Angles (extension)
There are different mechanisms of seabed scattering which are due to different types of seabed medium irregularities, which are roughness of the seabed interfaces, and volume heterogeneity: continuous (spatial fluctuations of the sediment acoustic parameters) and discrete scatterers (or sediment inclusions, such as relatively large shells and shell fragments). Given different environmental cond...
متن کاملComments on "On pore fluid viscosity and the wave properties of saturated granular materials including marine sediments" [J. Acoust. Soc. Am. 122, 1486-1501 (2007)].
The ability of the grain shearing (GS) and viscous grain shearing (VGS) models to relate geophysical and acoustic properties is tested by a method based on the claimed tight coupling between compressional and shear wave speeds and attenuations, which allows the test result to be quantified in a single parameter. The VGS model is claimed to provide a better fit to the measured sound speed and at...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001