A Numerical Simulation of Seismic Wave Caused by Low Frequency Sound Source in Shallow Sea with Thick PorousSediment by Staggered-grid Finite Difference Method

doi:10.3969/j.issn.1000-1093.2014.12.019

Abstract

Abstract: Elastic wave in the seabed caused by low frequency noise radiated from ship is the so-called ship seismic wave which can be used to identify ship target. In order to obtain the propagation characteristics of ship seismic wave in shallow sea with thick porous sediment, a 3D staggered grid finite difference algorithm for calculating seismic wave at seafloor is presented based on Biot wave theory for porous elastic sediment. Numerical calculation of seismic wave caused by low frequency sound source in a typical shallow sea environment is carried out. The calculated results show that the components of seismic wave in the near field include not only fast P-wave, slow P-wave and S-wave transmitted into the sediment, but also an interface wave which propagates nearby the seafloor. However in the far field, the wave components of seismic wave are mainly normal modes and interface wave, the former propagates mainly in the waveguide of sea water and the latter propagates along the seafloor.

Key words: vibration and wave, porous sediment, low frequency, shallow sea, seismic wave, staggered grid

CLC Number:

P733.23

LU Zai-hua, ZHANG Zhi-hong, GU Jian-nong. A Numerical Simulation of Seismic Wave Caused by Low Frequency Sound Source in Shallow Sea with Thick PorousSediment by Staggered-grid Finite Difference Method[J]. Acta Armamentarii, 2014, 35(12): 2065-2071.

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