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    Direct bed stress measurements under solitary tsunami-type waves and breaking tsunami wave fronts

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    Proc_Coast_Dyn_2009_13pp.pdf (1.270Mb)
    Date
    2009
    Author
    Jayakumar, S.
    Baldock, T.E.
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    Abstract
    During their propagation tsunamis often traverse continental slopes that are relatively steep compared to deeper oceans. Further due to the change of bed slope from offshore to near shore, there is every likely possibility that a tsunami might steepen and eventually break, thereby generating large pressure gradients that could enhance the likelihood of liquefaction of the seabed. In the drawdown, high shear stresses could trigger debris flow in submarine canyons and on steep ridges. Therefore estimation of the bed stress is important in estimation of the forces induced during tsunami wave propagation, both on the seabed as well as on the subsurface installations. Bed and shear stresses generated by wave forms that represent tsunami (a solitary wave and broken solitary wave in the form of a bore) are measured using a shear cell. This paper deals with the measurements and modeling of the bed stress under the solitary waves.
    URI
    http://drs.nio.org/drs/handle/2264/4170
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