| Qiu Xinfang,Zhang Renhe,Li Wenhua,Zhu Baixian,Jin Guoliang. 1997. Frequency-selective attenuation of sound propagation and reverberation in shallow water. Acta Oceanologica Sinica, (4):475－490 |
| Frequency-selective attenuation of sound propagation and reverberation in shallow water |
| Frequency-selective attenuation of sound propagation and reverberation in shallow water |
| Received:October 23, 1995 Revised:January 15, 1997 |
| DOI： |
| Key words:Sound propagation sound reverberation anomalous attenuation shallow water fish |
| 中文关键词: Sound propagation sound reverberation anomalous attenuation shallow water fish |
| 基金项目:This project was supported by the National Natural Science Foundation of China. |
| Author Name | Affiliation | | Qiu Xinfang | Shanghai Acoustics Laboratory, Chinese Academy of Sciences, Shanghai 200032, China | | Zhang Renhe | State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China | | Li Wenhua | State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China | | Zhu Baixian | Shanghai Acoustics Laboratory, Chinese Academy of Sciences, Shanghai 200032, China | | Jin Guoliang | Shanghai Acoustics Laboratory, Chinese Academy of Sciences, Shanghai 200032, China |
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| Abstract: |
| In the summer of 1991 studies of sound propagation and reverberation were carried out in the Huanghai (Yellow) Sea with a strong thermocline by using explosive sound sources.Experimental results of both the sound trans-mission loss along a certain course and the average reverberation intensity showed an abnormally large attenuation over a frequency range from 1 000 to 2 000 Hz when both the source and the receiver were located above the thermocline.An interesting point is that the anomalous attenuation of the average reverberation intensity obtained by using omnidirectional source and receiver and that of the transmission loss along the certain course exhibit a resonance-like or frequency-selective characteristic with the same centre frequency, similar bandwidth and wmparable extra attenuation values.Obviously, this anomalous attenuation cannot be explained by any anisotropic mechanism (e.g.,internal waves, regular fluctuations of sea surface or bottom, etc.).On the basis of the depth dependences of the transmission loss and reverberation intensity obtained by the authors and some indirect evidences, it is believed that the observed frequency-selective attenuation is due to fish with swim-bladders (probably, anchovies) living dispersedly above the thermocline. |
| 中文摘要: |
| In the summer of 1991 studies of sound propagation and reverberation were carried out in the Huanghai (Yellow) Sea with a strong thermocline by using explosive sound sources.Experimental results of both the sound trans-mission loss along a certain course and the average reverberation intensity showed an abnormally large attenuation over a frequency range from 1 000 to 2 000 Hz when both the source and the receiver were located above the thermocline.An interesting point is that the anomalous attenuation of the average reverberation intensity obtained by using omnidirectional source and receiver and that of the transmission loss along the certain course exhibit a resonance-like or frequency-selective characteristic with the same centre frequency, similar bandwidth and wmparable extra attenuation values.Obviously, this anomalous attenuation cannot be explained by any anisotropic mechanism (e.g.,internal waves, regular fluctuations of sea surface or bottom, etc.).On the basis of the depth dependences of the transmission loss and reverberation intensity obtained by the authors and some indirect evidences, it is believed that the observed frequency-selective attenuation is due to fish with swim-bladders (probably, anchovies) living dispersedly above the thermocline. |
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