Bottom Backscattering near Grazing Incidence in Shallow Water
- 1 December 1968
- journal article
- research article
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 44 (6) , 1713-1718
- https://doi.org/10.1121/1.1911318
Abstract
Data obtained from measurements of the backscattering of 48-kc sound from the sea bottom at 12 locations in the inshore waters of Hong Kong show that the bottom backscattering strength increases by some 25 dB as the textural grade changes from clay through silt and sand to rock. For the range of grazing angles from 0.5° to 6° the backscattering strength is constant. The experimental results also show that a knowledge of the percentage of sand and the effective bottom roughness is particularly useful for the estimation of bottom reverberation levels. The attenuation coefficient of 48-kc/sec sound at 20°C in the subtropical waters of Hong Kong is found to range from 9.4 to 12.8 dB/kyd, depending upon local conditions. The average value obtained is 11.2 dB/kyd.Keywords
This publication has 0 references indexed in Scilit: