Method for Measuring In-Situ Sound Velocity of Seafloor Sediments Using Guided Waves in Liquid Filled Tube
The in-situ acoustic parameters of seafloor sediments are one of the key parameters for calibrating the acoustic field environment of the seafloor stratum and carrying out a variety of marine engineering applications.Firstly,the finite difference algorithm of acoustic wave propagation in the fluid-filled tube-sediment physical model was established,and the characteristics of the received acoustic wave in the tube and its variation rule with sediment velocity were numerically simulated and analyzed,focusing on the change of propagation properties of the first wave with distance;furthermore,the experimental prototype that can be hooked up with the seafloor Static Cone Penetration Test device and its core components,such as acoustic transmitter and receiver and functional circuit boards,etc.,were developed on this basis,and the experimental test platform and relevant performance experimental tests were carried out.The acoustic signal characteristics of the guided waves generated by the excitation in the tube under the presence of different media outside the tube were compared and analyzed.The theoretical and the measured results show that the attenuation characteristics of the guided wave in the fluid-filled tube are affected by the sound velocity of the sediment,which can be used to inversely measure the sound velocity of the stratum,and the experimental measurements further demonstrate the feasibility of the method.
seafloor sedimentin-situ sound velocityguided waveattenuation of the first wavesstatic cone penetration
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