Title: Horizontal Anysotropy of the Sound Fluctuations in the Presence of Moving Nonlinear Internal Waves in Shallow Water
Speaker: Boris G. Katsnelson
From: Voronezh State University, Russia and University of Haifa, Israel
Time: 9:00 a.m., September 16, 2014
Place: Conference Room 218 at Dezhao South Building
Science and Technology Department
State Key Laboratory of Acoustics
In the lecture some review is presented of theoretical and experimental results for the fluctuations of sound signals crossing moving train of nonlinear internal waves (NIW). Typical length of an acoustic track is a few tens of km. It is shown that in dependence on angle between direction of an acoustic track and wave front of NIW we have different properties (parameters) of spatial and temporal fluctuations of sound signals measured by horizontal or/and vertical line arrays or single hydrophones. These different properties are provided by different mechanisms which are responsible for the sound fluctuations and depending on horizontal angle mentioned above: mode coupling, adiabatic variability and horizontal refraction. In the lecture all three mechanisms are analyzed and the corresponding experimental observations are submitted.
Boris G. Katsnelson is a Professor of Physics Department, Voronezh State University, Russia and the School of Marine Sciences, University of Haifa, Israel. He has done some excellent works on wave propagation theory, oceanography, underwater acoustics, acoustic tomography, and mathematical physics. He has hundred seventy publications including two books such as “Shallow water acoustics” and “Fundamentals of shallow water acoustics”. Recently, his research interests focus on sound propagation in three dimensional ocean environments.