Environmental Effects on Sound Propagation in Shallow Waters
Date Issued
2004
Date
2004
Author(s)
Chen, Yen-Hsun
DOI
zh-TW
Abstract
The comparison between the data of the transmission loss in the ASIAEX SCS experiment and the result of the numerical simulations is presented in this paper. In addition, we try to discuss the effect of water column and sediment property on the acoustic propagation in the ocean. In this paper, we mainly discuss the transmission loss of CW tones transmitted in 140 Hz during a segment of J-15-3 RUN2 which started at 05/05 23:31 and ended in 05/06 00:23. Furthermore, according to the comparison between theoretical calculations and practical data, we found the result of the numerical simulations would be similar to the practical data if the parameter of water column (internal wave) and sediments are corrected. Therefore, it is necessary to consider water column as well as sediment property further. The result of the calculation of the sediment shows the transmission loss would get lower as the sound speed gets higher and in 50-300Hz range, the effect depth of the sediment is an inverse proportion to the source frequency. The results of water column case show that due to internal waves, the fluctuation in sound propagation becomes severer. Therefore it is very important to find out the exact locations and speed of internal waves in the real ocean environment.
Subjects
淺海環境
音傳特性
Shallow Waters
Sound Propagation
Type
thesis
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