Accession Number : AD0772848

Title :   A Comparison of Measured and Calculated Acoustic Reflection Coefficients for a Saturated Kaolin-Water Artificial Sediment.

Descriptive Note : Master's thesis,


Personal Author(s) : Wellborn,Robert Morgan , Jr

Report Date : DEC 1973

Pagination or Media Count : 49

Abstract : An acoustic energy reflection experiment was conducted in a laboratory tank containing water and an artificial kaolin sediment. The reflection coefficient for the sediment was measured for a limited range of angles of incidence at one frequency and one set of measured sediment mass physical and viscoelastic properties. A mathematical reflection model was derived in terms of the known sediment properties. The measured and the theoretically calculated reflection coefficients are compared. The measured reflection coefficient and a probable angle of intromission showed poor agreement with theoretically predicted values. For the sediment parameters of the relatively soft clay used here, the reflection model is quite sensitive to values of sediment density and sound speed and is only mildly sensitive to values of dynamic rigidity and sound absorption coefficient near the angle of intromission. (Author)

Descriptors :   *Acoustic reflection, *Sediments, *Ocean bottom, Test methods, Kaolinite, Mathematical models, Layers, Theses, Instrumentation, Sonar transducers

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE