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1 1997

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Feasibility of the acoustic approach to remote sensing of water current with respect to Fram Strait

Dubrovsky N. A., Esipov I. B., Naugolnykh K. B., Tuzhilkin Y. I.

Hydroacoustics

1997

Vol. 1

263--268

Results of the computation model of the sound propagation in Fram Strait environment condition is discussed. 3D environment has been simulated with respect to statistical properties of the real cross-section of the strait. The model demonstrates the presents of the stable rays which structure is not changed under the varying environment condition. Travel time variations are presented for the signal propagated along the stable rays through the 200 km path in transverse direction refer to water flow. Obtained data are useful for the estimation of the potential accuracy of the remote sound sensing application for the measurement of the inhomogeneous flow movement. The method developed relies on the advections of small-scale inhomogeneities across the acoustic path and travel-time variations in process of signal crossing the Strait on a number of paths to infer the intervening of fme-scale variability and transverse current. These inhomogeneities produce perturbations in the travel time of the sound and the current can be sensed by generating a timelagged cross-correlation of the full acoustic field. The linear four element transmission array and the four element receiving array with equally spaced elements were used for calculations. By combining the signals from each transmitter-receiver pair in different ways, a number of different paths position were probed and profile of transverse current along the propagation path was retrieved. Calculations done in frame of ray model of the signal propagation.