Three different directions of sound propagation in the China South Sea

Abstract

In June 2004 three directions of sound propagation experiments were done in the China South Sea. One direction is equally sea depth. The second direction is slope. The third direction is largest gradient in sea depth direction. In the mean time three temperature chains have been applied for measuring the internal wave. During each temperature chain their distances are about 1000 m. The experiment results show that the packet of solitary waves has been found and each direction of sound propagation has different transmission loss. In the equally sea depth direction the sound propagation has the smallest transmission loss. And in the largest sea depth direction the sound propagation has the largest transmission loss. By three temperature chains data the packet of solitary waves propagation velocity and direction may be measured. And through the packet of solitary waves propagation direction the packet of solitary waves may be induced by the West Sand Island. In the end the couple normal mode program has been used to simulate the sound propagation which is affected by the packet of solitary waves. The simulating results are compared to experimental data.