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放物型方程式法による浅海域音波伝搬解析 Sound Propagation analysis in a Shallow Sea Area by Parabolic Equation Method 倉本, 和興 クラモト, カズオキ 神吉, 隆司 カンキ, タカシ KURAMOTO, Kazuoki KANKI, Takashi One of the most simple and effective ways of giving instructions to divers and preventing diving accidents is to transmit an audio signal directly in water. In such a case, it is fundamentally important to grasp the sound field in an audio frequency range and the propagation pattern at actual shallow sea area. In this study, we introduce the Parabolic Equation (PE) Method, which is an effective sound propagation analysis in the case of complex ocean environments like a coast shallow sea area, and we show the several numerical results by the PE method based on a simple analysis model. Also, we indicate the depth dependences of sound pressure level obtaind in Kure Bay for each season, in summer and in winter, by calculationg the PE model with each season's sound profile. 海上保安大学校 2006-03-30 jpn departmental bulletin paper VoR https://doi.org/10.15053/0000000307 https://jcga.repo.nii.ac.jp/records/307 10.15053/0000000307 10.15053/2005.21.06 AN10088865 0287-2951 海上保安大学校研究報告, 理工学系 Report of Japan Coast Guard Academy Part 2 (The Science and Engineering Section) 49 1-2 55 64 https://jcga.repo.nii.ac.jp/record/307/files/2_49-1-71-06_Kuramoto.pdf application/pdf 490.5 kB 2023-06-20