Study on acoustic reflection characteristics of layered sea ice based on boundary condition method

Abstract

According to the boundary conditions between two adjacent layers, a method for calculating the acoustic reflection coefficient of the layered ice-snow model is proposed, which is called the boundary condition method (BCM). Based on the actual ice parameters chosen from Schwarz and Weeks data, reflection coefficients under different conditions are analyzed. Comparing the BCM with the impedance transfer method (ITM), the results verified the validity of the BCM. After calculating and analyzing the multilayer ice-snow, it can be found that snow layer has more influence on the low-frequency sound waves. Snow layers have varying effects on the sound reflection coefficient depending on ice thickness: the thicker the ice layer is, the less influence the snow layer has on the sound reflection coefficient. The ice reflection coefficient model is combined with the Bellhop sound field simulation model, and the sound field simulation results are compared with the ninth Chinese polar scientific expedition results.

KEYWORDS:

• Arctic
• wave
• reflection
• layered ice-snow

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Key Research and Development Program of China (grant number 2018YFC140021), the Nation Natural Science Foundation of China (grant numbers 61631008, 61471137, 50509059, 51779061), the Fok Ying Tong Education Foundation (grant number 151007), the Outstanding Youth Science Fund of Heilongjiang Province (grant number JC2017017), and the Fundamental Research Funds for the Central Universities of China (grant number HEUCFM180503).