Determination of a New Cut-off Frequency Coefficient for Sound Propagation in the Surface Duct

표층도파관 내에서의 새로운 Cut-off 주파수 계수결정

In the mixed layer when the frequency approaches the cut-off frequency for the first mode of notmalmode theory, sound ceases to be trapped. Based on the data of surface sound velocities abtained during the period of 16 years in the Sea of Japan. A new cut-off frequency coefficient in the surface duct that will determine the miximum wave length for duct transimission of underwater sound has been calculated.