2019_programme: VARIABILITY OF THE SOUND FIELD IN THE PRESENCE OF INTERNAL KELVIN WAVES IN A STRATIFIED LAKE

• Session: 26. Sound propagation in shallow and deep water
  Organiser(s): N/A
• Lecture: VARIABILITY OF THE SOUND FIELD IN THE PRESENCE OF INTERNAL KELVIN WAVES IN A STRATIFIED LAKE
  Paper ID: 778
  Author(s): Uzhansky Ernst, Katsnelson Boris, Lunkov Andrey, Ostrovsky Ilia
  Presenter: Uzhansky Ernst
  Presentation type: oral
  Abstract: The spatiotemporal variability of low- and mid-frequency sound field in the presence of internal Kelvin waves (IKWs) was studied in Lake Kinneret. Experimental measurements of the sound field were carried out in Lake Kinneret (Israel) using a vertical line array (VLA) consisting of ten hydrophones with 3 m spacing. The VLA was deployed in the deepest (37 m) part of the lake. Signals were transmitted from the source deployed at peripheral lake location at distance of 5.5 km from the VLA at 5-m depth. Linear frequency modulation pulses (300 – 2000 Hz) were transmitted at 5-sec intervals during >24 hours (the period of the IKWs). IKWs were registered using three thermistor chains (TCs) positioned along an offshore transect at 10-m, 20-m, and 37-m station depths. This setting allowed us to characterize the variations of thermal structure and the corresponding sound speed profile along the transect. The vertical structure of the sound field registered with the VLA shows the connection with temporal variability of IKWs. The modeling of sound propagation was done using Parabolic Equation (PE) method, taking into account the parameters of bottom and lake bathymetry. The PE results showed close agreement with our experimental measurements. [This work was supported by Israel Science Foundation]
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• Corresponding author: Mr Uzhansky Ernst
  Affiliation: Department of Marine Geosciences, University of Haifa
  Country: Israel
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