摘要Spatial correlation coefficient is one of the most important parameters for the description of sound propagation in shallow water. Frequency dependence of the longitudinal correlation length is still an open topic. We observe in a shallow water experiment that the longitudinal correlation length in units of wavelength increases with the increase of frequency. This phenomenon has not been seen in the published papers. The theoretical analysis and numerical simulations indicate that the non-linear frequency relationship of the bottom attenuation is the main cause of this phenomenon.
Spatial correlation coefficient is one of the most important parameters for the description of sound propagation in shallow water. Frequency dependence of the longitudinal correlation length is still an open topic. We observe in a shallow water experiment that the longitudinal correlation length in units of wavelength increases with the increase of frequency. This phenomenon has not been seen in the published papers. The theoretical analysis and numerical simulations indicate that the non-linear frequency relationship of the bottom attenuation is the main cause of this phenomenon.
[1] Carey W M and Cable P G 2000 Proc. Fifth EuropeConference on Underwater Acoustics (Lyon 10--13 July 2000) p 1049 [2] Gorodetskaya E Y, Malekhanvo A I, Sazontov A G andVdovicheva N K 2000 Proc. Fifth Europe Conference on UnderwaterAcoustics (Lyon 10--13 July 2000) p 1031 [3] Wang Q and Zhang R H 1992 J. Acoust. Soc. Am. 92 932 [4] Zhu R C and Guan D H 1992 J. Acoust. Soc. Am. 92 950 [5] Pasewark B H, Wolf S N, Orr M H and Lynch J F 2002 J.Acoust. Soc. Am. 112 2450 [6] Peng H S and Li F H 2006 Chin. Phys. Lett. 241977 [7] Hamilton E L 1980 J. Acoust. Soc. Am. 68 1313 [8] Stoll R D 1974 Physics of Sound in Marine Sediments(NewYork: Plenum) p 19 [9] Zhou J X, Zhang X Z, Rogers P H and Jacek J 1987 J.Acoust. Soc. Am. 82 2068 [10] Li F H and Zhang R H 2000 Chin. J. Acoust. 25 297 (in Chinese) [11] Li Z L and Zhang R H 2004 Chin. Phys. Lett. 21 1100 [12] Li Z L, Zhang R H, Yang J, Li F H and Liu J J 2004 IEEE J. Oceanic Engin. 29 973