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Mid-frequency sound propagation through internal waves at short range with synoptic oceanographic observations
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View: Figures


Image of FIG. 1.

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FIG. 1.

(Color online) Experiment geometry. Acoustic source deployed off the stern of the R/V KNORR with transmitted signals measured away on MORAY vertical array. Oceanographic data were collected on R/V OCEANUS while a nonlinear internal wave passed.

Image of FIG. 2.

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FIG. 2.

(Color online) Typical acoustic arrival structure during quiescent period. Data collected on an array element at depth and range. Shown is the matched filter output where the various arrival paths are indicated.

Image of FIG. 3.

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FIG. 3.

(Color online) Sample oceanographic result showing vertical component of fluid velocity as measured on R/V OCEANUS. Contours of isopycnals are plotted over the color image. Peak isopycnal displacement from a nonlinear internal wave occurs at 21:14 UTC.

Image of FIG. 4.

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FIG. 4.

(Color online) Time evolving acoustic arrival structure as the nonlinear internal wave in Fig. 3 enters the acoustic propagation path. The bottom, bottom-surface, and surface-bottom bounce paths are labeled. New acoustic path (circled) is generated as the internal wave passes above the acoustic source. Red-green-blue color scale has dynamic range.


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Preliminary results are presented from an analysis of mid-frequency acoustic transmission data collected at range during the Shallow Water 2006 Experiment. The acoustic data were collected on a vertical array immediately before, during, and after the passage of a nonlinear internal wave on 18 August, 2006. Using oceanographic data collected at a nearby location, a plane-wave model for the nonlinear internal wave’s position as a function of time is developed. Experimental results show a new acoustic path is generated as the internal wave passes above the acoustic source.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mid-frequency sound propagation through internal waves at short range with synoptic oceanographic observations