期刊
JOURNAL OF MARINE SCIENCE AND ENGINEERING
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/jmse11010211
关键词
ocean acoustics; pockmark; low-frequency sound; gas-saturated sediment; wavefield propagator
This paper investigates low-frequency sound propagation in a 10-km long waveguide crossing a giant pockmark and presents a new method of acoustic waveguide scanning based on measurement of the wavefield propagator. This method allows for exploration of attenuation anomalies associated with the gas-saturated bottom region. By identifying beams that enter the pockmark area and experience strong losses, as well as beams that avoid pockmark-assisted losses, one can estimate probable locations of the pockmark segment in the waveguide.
Bottom formations known as pockmarks basically arise due to extensive gas emission. Active pockmarks are characterized by exceptionally high gas saturation and substantially reduced sound speed. The latter circumstance leads to strong attenuation of sound waves contacting with a pockmark. In the present paper, we study low-frequency sound propagation in a 10-km long waveguide crossing a giant pockmark. A new method of acoustic waveguide scanning based on measurement of the wavefield propagator is represented. This method allows one to explore attenuation anomalies associated with the presence of the gas-saturated bottom region. In particular, one can find out which beams fall into a pockmark area and therefore experience strong losses. Identifying such beams, as well as beams which avoid pockmark-assisted losses, one can estimate probable locations of the pockmark segment in the waveguide, provided information about the background medium is sufficient.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据