Tank Experiment for Backscattering Measurements from Rough Bottom Interfaces

Title
Tank Experiment for Backscattering Measurements from Rough Bottom Interfaces
Author(s)
손수욱; 조성호; 최지웅
KIOST Author(s)
Cho, Sungho(조성호)
Publication Year
2015-11-05
Abstract
Sound propagation in shallow water undergoes acoustic interactions with both sea surface and bottom interfaces, causing reverberation effects. Especially, in case of a downward refracting sound speed profile, the important ray paths consist of the bottom-interacting paths. There have been several efforts to investigate the physics of bottom scattering mechanisms [1-4]. In general, the high-frequency backscattering from ocean seafloor consists of scattering at the water-sediment interface and scattering caused by inhomogeneities below the sediment interface. It is important to measure the bottom roughness profile to understand the bottom scattering mechanisms. The bottom roughness spectra have been estimated using a variety of techniques, including electrical resistivity probe, sidescan sonar, stereo photography, laser line scanning, and multi-beam echo sounder.[1, 5-8] In this study, to investigate the relationship between the bottom roughness and the bottom backscattering at rough bottom condition, bottom interface roughness and 50-kHz bottom backscattering strengths were measured for two-different types of roughness, which were artificially formed on a sandy bottom in the water tank. The measured bottom backscattering strengths will be discussed in comparison with the model predictions obtained using the measured rougness spectra in this paper. of the bottom-interacting paths. There have been several efforts to investigate the physics of bottom scattering mechanisms [1-4]. In general, the high-frequency backscattering from ocean seafloor consists of scattering at the water-sediment interface and scattering caused by inhomogeneities below the sediment interface. It is important to measure the bottom roughness profile to understand the bottom scattering mechanisms. The bottom roughness spectra have been estimated using a variety of techniques, including electrical resistivity probe, sidescan sonar, stereo photography, laser line scanning, and multi-beam echo sounder.[1, 5-8] In this study, to investigate the relationship between the bottom roughness and the bottom backscattering at rough bottom condition, bottom interface roughness and 50-kHz bottom backscattering strengths were measured for two-different types of roughness, which were artificially formed on a sandy bottom in the water tank. The measured bottom backscattering strengths will be discussed in comparison with the model predictions obtained using the measured rougness spectra in this paper.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25155
Bibliographic Citation
The 36th Symposium on Ultrasonic Eletronics(USE) 2015, pp.1 - 2, 2015
Publisher
Japanese Journal of Applied Physics
Type
Conference
Language
English
Publisher
Japanese Journal of Applied Physics
Related Researcher
Research Interests

Underwater Acoustic Modeling,Signal Processing,Underwater Target Detection,수중음향모델링,신호처리,수중표적탐지

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