Anomalous sound propagation due to the horizontal variation of�
seabed acoustic properties

Li, Zhenglin; Zhang, Renhe; Peng, Zhaohui; Li, Xilu

doi:10.1360/04yw0027

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…(10) in Ref. [13] at eight frequency points within 1/3-octave bandwidth corresponding to the central frequency 0 . After obtaining the sound speed and the density, we next invert the attenuation coefficient.…”

Section: -2mentioning

confidence: 99%

Geoacoustic Inversion for Bottom Parameters in the Deep-Water Area of the South China Sea

Qin

2015

Chinese Phys. Lett.

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Bottom acoustic parameters play an important role in sound field prediction. Acoustic parameters in deep water are not well understood. Bottom acoustic parameters are sensitive to the transmission-loss (TL) data in the shadow zone of deep water. We propose a multiple-step TL inversion method to invert sound speed, density and attenuation in deep water. Based on a uniform liquid half-space bottom model, sound speed of the bottom is inverted by using the long range TL at low frequency obtained in an acoustic propagation experiment conducted in the South China Sea (SCS) in summer 2014. Meanwhile, bottom density is estimated combining with the Hamilton sediment empirical relationship. Attenuation coefficients at different frequencies are then estimated from the TL data in the shadow zones by using the known sound speed and density as a constraint condition. The nonlinear relationship between attenuation coefficient and frequency is given in the end. The inverted bottom parameters can be used to forecast the transmission loss in the deep water area of SCS very well.

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Section: -2mentioning

confidence: 99%

Geoacoustic Inversion for Bottom Parameters in the Deep-Water Area of the South China Sea

Qin

2015

Chinese Phys. Lett.

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“…The absolute datum transfer is carried out by two steps in traditional measurement [1,2]. First, the horizontal datum transfer is done by double-three-pyramid method; second, the vertical datum transfer is fulfilled by four-leaf method combined with tide level of the measurement region.…”

Section: Introductionmentioning

confidence: 99%

A new method for absolute datum transfer in seafloor control network measurement

et al. 2015

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To decrease the time consumption and the labor intensity in the absolute datum transfer of traditional seafloor control network measurement, a new method, namely sailing-circle positioning method, is put forward in this paper. First, the traditional intersection positioning model is improved by considering the equivalent sound velocity profile error as an unknown parameter in the adjustment model. Second, the effect of geometric dilution of precision (GDOP) on positioning accuracy is analyzed. By seeking for the minimum of GDOP, it is concluded that the absolute datum transfer can achieve the highest accuracy in the condition of sailing along a circle relative to other sailing paths. Moreover, the optimal radius of the circle for the accurate datum transfer is also given out. Besides, the correlation between the accuracy of datum transfer and the sound velocity error in this method is analyzed. Finally, the new method was tested and verified by the experiments in Songhua lake with the water depth of 60 m and in South China sea with the water depth of 2000 m, respectively. These experiment results show that the new method can improve the accuracy and efficiency of traditional datum transfer method significantly.

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Geoacoustic inversion for sediments in the South China Sea based on a hybrid inversion scheme

2010

Chin. J. Ocean. Limnol.

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Anomalous sound propagation due to the horizontal variation of� seabed acoustic properties

Cited by 4 publications

References 7 publications

Geoacoustic Inversion for Bottom Parameters in the Deep-Water Area of the South China Sea

Geoacoustic Inversion for Bottom Parameters in the Deep-Water Area of the South China Sea

A new method for absolute datum transfer in seafloor control network measurement

Geoacoustic inversion for sediments in the South China Sea based on a hybrid inversion scheme

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