Spatial distribution of sound speed (m/s)-at sea surface

Spatial variation of channel axis dapth (m) at the channel axis

Spatial variaton of channel axis dapth (m)

Fig. 1

Fig. 2　Annual mean sound speed profiles.

Fig. 3　Ray lounch ongle vs Travel time for a range of 300km.

Fig. 4　Intensity loss over 300km range.

Fig. 5　Acoustic energy loss at 400Hz due to (a) boric acid; (b) magunesium sulphate; (c)pure water and (d) total absorption

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