Title :
240-kHz bistatic bottom scattering measurements in shallow water
Author :
Choi, Jee Woong ; Na, Jungyul ; Seong, Woojae
Author_Institution :
Dept. of Earth & Marine Sci., Hanyang Univ., Ansan, South Korea
fDate :
1/1/2001 12:00:00 AM
Abstract :
High-frequency bistatic sediment scattering experiment was conducted in the shallow waters off the east coasts of Korea. Acoustic data were taken as a function of grazing angle (30°, 45°, and 60°), scattered angle (30°, 45°, and 60°), and bistatic (azimuthal) angle (0°, 60°, and 120°). Besides a flat bottom it was artificially raked so as to produce directional ripples. The measured scattering strengths for a flat bottom were compared to model predictions of D.R. Jackson et al. (1986). The surface reverberation component is seen to dominate over the volume scattering part at the frequency of 240 kHz. Compared to the flat bottom case, the scattering strengths for directional ripples showed lower and higher variation depending on the ripple´s orientation
Keywords :
oceanographic techniques; reverberation; seafloor phenomena; sediments; sonar; ultrasonic scattering; underwater acoustic propagation; 240 kHz; HF bistatic sediment scattering; azimuthal angle; bistatic bottom scattering measurements; bottom roughness orientation; directional ripples; flat bottom; grazing angle; model comparison; scattered angle; shallow water; surface reverberation component; volume scattering part; Acoustic measurements; Acoustic scattering; Frequency; Reverberation; Rough surfaces; Sea measurements; Sea surface; Sediments; Sonar detection; Surface roughness;
Journal_Title :
Oceanic Engineering, IEEE Journal of
