Article

Retrieval of Modal Dispersion Curves and Estimation of Bottom Parameters Using Correlation Function of Shipping Noise (en)

* Presenting author
Day / Time: 08.03.2023, 10:20-10:40
Room: Saal X 3-4
Typ: Vortrag (strukturierte Sitzung)
Abstract: A methodology is proposed to retrieve the modal dispersion dependencies in a shallow water waveguide based on a correlation function of the shipping noise recorded by two synchronized vertical line arrays. Using the proposed approach, an experimental study of the modal structure of a low-frequency sound field in a Lake Kinneret, Israel, with a gas-saturated bottom was carried out in a wide frequency band from 20 to 250 Hz. It is known, that upper layer of sediment of the lake contains methane bubbles (~ 1% by volume) and, consequently, has low sound speed ~100 m/s. The receiving system was two 27-m vertical arrays located at a distance ~40 m from each other in 40.4 m-deep water. The noise source, a research vessel, was moving along a straight line containing the arrays up to 1 km range from them. The frequency dependences of the phase speed for the first 12 modes are found, and these dependences turned out to be close to those for a waveguide with a perfectly soft bottom. Phase of the reflection coefficient is constructed as well, that can allow us to estimate bottom parameters. [This work was supported, in part, by ISF, grant 946/20.]
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