Application of hydroacoustic radiators for the generation of seismic waves

Averbakh, V. S.; Bogolyubov, B. N.; Dubovoi, Yu. A.; Zaslavskii, Yu. M.; Лебедев, А. В.; Maryshev, A. P.; Назаров, В. Е.; Pigalov, K. E.; Talanov, V. I.

doi:10.1134/1.1460944

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…(3) Scholte wave in shallow sea seismic wave is a surface wave propagating at underwater interface, and the amplitude of Scholte wave is large in a certain depth [11]. (4) The amplitude attenuation of Scholte wave propagating at the underwater interface is small, which can detect long-distance targets [12].…”

Section: Introductionmentioning

confidence: 99%

Study on propagation characteristics of Scholte wave in shallow sea at non-horizontal underwater interface

Zhao¹,

Meng²,

Gu³

et al. 2022

J. vibroeng.

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Theoretical and simulation studies are carried out to study the propagation characteristics of Scholte waves in non-horizontal underwater interface of shallow sea. The dispersion and polarization characteristics of Scholte waves in horizontal layered underwater interface are analyzed by using wave theory and staggered grid finite difference method. The effectiveness of the method used in this paper is proved from the perspective of theory and simulation. The propagation characteristics and polarization characteristics of Scholte waves in non-horizontal underwater interface are also analyzed. At the wedge-shaped underwater interface, the particle trajectory of Scholte wave is related to the angle between the propagation direction and the underwater interface, and with the increase of the angle, the deflection angle of the particle trajectory increases. At the bulged underwater interface, the particle trajectory of seismic wave has nothing to do with the propagation direction and the bulged underwater interface, but the bulged underwater interface has a great influence on the amplitude of seismic wave. The research results are of great significance to underwater target detection and geological exploration.

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Section: Introductionmentioning

confidence: 99%

Study on propagation characteristics of Scholte wave in shallow sea at non-horizontal underwater interface

Zhao¹,

Meng²,

Gu³

et al. 2022

J. vibroeng.

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“…Previous experimental studies investigated the transformation of underwater acoustic radiation into seismo-acoustic waves [6][7][8]. Theoretically studies of seafloor seismic wave excited by low-frequency acoustic sources also have been done in order to obtain the propagation characteristics of ship seismic waves [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the seismic wave caused by low frequency sound source in shallow sea based on multi-transmitting formula artificial boundary

Lu¹,

Ma²,

Chen³

2022

J. vibroeng.

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The elastic waves propagating in seabed caused by sailing ships are called ship seismic waves, which can be used to identify ship targets. The wave components and the influences of source frequency, source depth and depth of seawater to the seismic waves are important to the application of seismic wave to detect ship targets. Thus, a forward numerical simulation of seismic waves in shallow sea excited by low frequency sources in time domain was carried out with finite element method based on the Multi-Transmitting Formula artificial boundary. The numerical results show that the body waves and conical waves decay faster in space, but the interface wave decays relatively slow. Multi-transmitting Formula (MTF) artificial boundary has achieved good transmitting effect for longitudinal wave, upstream and downstream acoustic wave and transverse wave. When the source frequency is very low and the seawater layer is shallow, due to the effect of low-frequency cutoff, there is no normal mode wave which can propagate without attenuation in the seawater waveguide, and only the interface wave is propagating near the sea bottom surface. When the frequency of the source or the depth of the seawater layer increases, the effect of low frequency cutoff in the shallow water waveguide is weakened, and the normal mode waves propagating in seawater layer are gradually excited. The intensity of the interface wave caused by low-frequency point sound source mainly depends on the distance between the source and the seafloor.

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“…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. According to the measurement mechanism, doublethree-pyramid method has the following defects which will decrease the accuracy and efficiency of the horizontal datum transfer [3,4]: (1) to avoid the significant influence of sea current on the accuracy of datum transfer, multiple survey vessels or carriers are required to operate synchronously; (2) the accurate measurement distance depends strictly on SVPs, so it is necessary to measure SVPs in the survey region at different measurement times. If limited SVPs or only a surface sound velocity are adopted, significant equivalent SVP errors will be brought to the calculation of measurement distances between the vesselmounted transducer and the underwater transponder, and thus influences the final positioning accuracies of seafloor control points [5]; (3) the operation is time consuming and labor intensive.…”

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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Application of hydroacoustic radiators for the generation of seismic waves

Cited by 8 publications

References 2 publications

Study on propagation characteristics of Scholte wave in shallow sea at non-horizontal underwater interface

Study on propagation characteristics of Scholte wave in shallow sea at non-horizontal underwater interface

Analysis on the seismic wave caused by low frequency sound source in shallow sea based on multi-transmitting formula artificial boundary

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

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