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Range (km)

Figure 3.20 Ray diagram for a sound source located at a depth of 16 m, showing propagation and trapping of energy in the surface duct, with a shadow zone below 60 m, for the sound-speed profile shown at the right. (Urick, 1983; Principles of Underwater Sound, 3rd edn; reproduced with permission of McGraw-Hill Publishing Company.)

Range (km)

Figure 3.20 Ray diagram for a sound source located at a depth of 16 m, showing propagation and trapping of energy in the surface duct, with a shadow zone below 60 m, for the sound-speed profile shown at the right. (Urick, 1983; Principles of Underwater Sound, 3rd edn; reproduced with permission of McGraw-Hill Publishing Company.)

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