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  • Ocean Bottom Hydrodynamic Pressure due to Vertical Seismic Motion

    Author(s)
    Chen, Weiyun
    Chen, Guoxing
    Jeng, Dongsheng
    Xu, Lingyu
    Griffith University Author(s)
    Jeng, Dong-Sheng
    Year published
    2020
    Metadata
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    Abstract
    Earthquake-induced hydrodynamic pressure on the ocean floor is a key factor in evaluating the surface disturbance and dynamic response of the seabed under the action of a submarine earthquake. An analytical study considering the compressibility of seawater was carried out to obtain the closed-form solution for the hydrodynamic pressure, which depends on water depth, excitation frequency, and seabed characteristics. The commonly used approximate expression for the hydrodynamic pressure, which neglects the compressibility of seawater and is associated with the dynamic displacement of the seabed surface, is presented and compared ...
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    Earthquake-induced hydrodynamic pressure on the ocean floor is a key factor in evaluating the surface disturbance and dynamic response of the seabed under the action of a submarine earthquake. An analytical study considering the compressibility of seawater was carried out to obtain the closed-form solution for the hydrodynamic pressure, which depends on water depth, excitation frequency, and seabed characteristics. The commonly used approximate expression for the hydrodynamic pressure, which neglects the compressibility of seawater and is associated with the dynamic displacement of the seabed surface, is presented and compared with the analytical solution. The results reveal that the formulation neglecting the compressibility of overlying seawater could underestimate the hydrodynamic pressure at the ocean bottom and the induced dynamic responses in a poroelastic seabed. Finally, a modified formula for the seismic-induced hydrodynamic pressure at the ocean bottom interface, which is able to consider the compressibility of seawater, is proposed by incorporating the nondimensionalized frequency.
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    Journal Title
    International Journal of Geomechanics
    Volume
    20
    Issue
    9
    DOI
    https://doi.org/10.1061/(ASCE)GM.1943-5622.0001802
    Subject
    Civil engineering
    Resources engineering and extractive metallurgy
    Science & Technology
    Engineering, Geological
    Engineering
    Hydrodynamic pressure
    Publication URI
    http://hdl.handle.net/10072/400487
    Collection
    • Journal articles

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