ACOUSTIC POINT-SOURCE REFLECTION FROM A SEABED WITH A NON-UNIFORM FLUID-LIKE SEDIMENT LAYER

Authors

Jin-Yuan Liu, Institute of Undersea Technology, National Sun Yat-sen University, and NCKU-NSYSU Research Center for Ocean Environment and Technology, 70 Lian-Hae Road, Kaohsiung, Taiwan 804, R.O.C.Follow
Chung-Ray Chu, Institute of Undersea Technology, National Sun Yat-sen University, and NCKU-NSYSU Research Center for Ocean Environment and Technology, 70 Lian-Hae Road, Kaohsiung, Taiwan 804, R.O.C.
Yung-Hong Wu, Institute of Undersea Technology, National Sun Yat-sen University, and NCKU-NSYSU Research Center for Ocean Environment and Technology, 70 Lian-Hae Road, Kaohsiung, Taiwan 804, R.O.C.
Hsin-Hung Chen, Institute of Undersea Technology, National Sun Yat-sen University, and NCKU-NSYSU Research Center for Ocean Environment and Technology, 70 Lian-Hae Road, Kaohsiung, Taiwan 804, R.O.C.

Abstract

Acoustic point-source reflection from a non-uniform seabed within which the density and sound speed vary continuously with depth is considered in this paper. This fundamental problem has illuminated many interesting phenomena about the effects of sediment stratification on acoustic wave interactions with the seabed. The analysis employs the analytical solutions for the Helmholtz equation in the sediment layer, in which the density and the sound speed are, respectively, described by three kinds of geological models. The results have demonstrated that the effects of sediment stratification are confined in a region in range, where the reflection field is dominated by the reflected ray bundles containing ray components with the grazing angles that are neither too steep nor too shallow. The effects of many other factors, such as frequency, sediment thickness, basement elasticity, on the reflection field are investigated; in particular, the interface wave component may become important in the region close to the seabed, if the sediment thickness is relatively thin in comparison with the acoustic wave length

Recommended Citation

Liu, Jin-Yuan; Chu, Chung-Ray; Wu, Yung-Hong; and Chen, Hsin-Hung (2005) "ACOUSTIC POINT-SOURCE REFLECTION FROM A SEABED WITH A NON-UNIFORM FLUID-LIKE SEDIMENT LAYER," Journal of Marine Science and Technology: Vol. 13: Iss. 3, Article 8.
DOI: 10.51400/2709-6998.2129
Available at: https://jmstt.ntou.edu.tw/journal/vol13/iss3/8