Abstract
A mathematical model was developed to calculate acoustic wave in a shallow sea under an ice layer for low frequency signals of 40-150 Hz. An experimental unit was developed by the authors on the basis of a low-frequency piston-type electrodynamic radiator which is capable of making experiments in layered environment. The experiments show satisfactory agreement with theoretical investigations. The peculiarities of wave propagation at water-ice boundary are under investigation. The developed models may be applied for new engineering systems for earthquake forecast when installing receiving systems in an ice layer.
Highlights
Development of new communication means for shelf zone investigation, earthquake predictions require effective techniques to calculate wave processes in a shallow sea
The aim of the paper is to investigate experimentally the mathematical model of strong acoustic signal propagation in a shallow sea covered by ice
A mathematical model of three-element antenna array was taken as a receiver: – Frequency is f=1500 Hz; – Wavelength is λ=1 meter; – Ice thickness is d=0,4 meter; – Ultrasound wave propagation velocity in the water is 1500 m/s; – Ultrasound wave propagation velocity in the air 331 m/s; – Ultrasound wave propagation velocity in the ice 3980 m/s; – Distance between the radiator and the hydrophone is 100 m
Summary
Development of new communication means for shelf zone investigation, earthquake predictions require effective techniques to calculate wave processes in a shallow sea. The main mathematical problem of analysis of a filed in a shallow sea is the lack of boundary condition uniformity in different directions of space. We suggest to apply «directed» Green's functions to solve the problems of calculation of the field in a space inhomogeneous in angular coordinates [5, 6]. Water and ground layer are chosen from real characteristics of shallow sea. Such a problem can be taken as the initial one when calculating hydroacoustic radiator placed in an ocean under an ice cover [5, 6]. Main characteristics of the radiator: - Work is 20 J. - Frequency range is from 40 Hz to 1000 Hz
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