A Spectral Coupled-Mode Formulation for Sound Propagation around Axisymmetric Seamounts

作     者：骆文于 SCHMIDT Henrik 

作者机构：State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing 100190 Department of Mechanical Engineering Massachusetts Institute of Technology Massachusetts 02139 U.S.A. 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2010年第27卷第9期

页      面：131-134页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0706[理学-大气科学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

基　　金：Massachusetts Institute of Technology and Woods Hole Oceanographic Institution 

主　　题：Formulations 

摘      要：A spectral coupled-mode solution of the three-dimensional （319） acoustic field generated by a point source in the presence o[ an axisymmetric seamount is developed. Based on the same theoretical foundation as the for- mulation presented by Taroudakis [3. Comput. Acoust. 4 （1996） 101], the present approach combines a spectral decomposition in azimuth with a coupled-mode theory for two-way range-dependent propagation. However, the earlier formulations are severely limited in terms of frequency, size and geometry o[ the seamount, the seabed composition, and the distance between the source and the seamount, and are there/ore severely limited in regard to realistic seamount problems. Without changing the fundamental theoretical foundation, the present approach applies a number of modifications to the formulation, leading to orders of magnitude improvement in numerical efficiency for realistic problems. Therefore, realistic propagation and scattering scenarios can be modeled, including effects of seamount roughness and realistic sedimentary structure.