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  • Combined wave-current induced excess pore-pressure in a sandy seabed: Flume observations and comparisons with theoretical models

    Author(s)
    Qi, Wen-Gang
    Li, Chang-Fei
    Jeng, Dong-Sheng
    Gao, Fu-Ping
    Liang, Zuodong
    Griffith University Author(s)
    Jeng, Dong-Sheng
    Liang, Zuodong
    Year published
    2019
    Metadata
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    Abstract
    Waves are coexisting with currents in coastal zones; nevertheless, previous experimental studies for excess pore-pressure responses in a porous seabed were predominantly limited to the wave-only condition. In this study, the combined wave-current induced excess pore-pressures in a sandy seabed were experimentally simulated with a specially-designed flume, which can concurrently generate periodic waves and a following/opposing co-directional current. The effect of a current on the wave profile is firstly examined. The wave steepness is decreased by a following current, but enhanced by an opposing current. Flume observations ...
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    Waves are coexisting with currents in coastal zones; nevertheless, previous experimental studies for excess pore-pressure responses in a porous seabed were predominantly limited to the wave-only condition. In this study, the combined wave-current induced excess pore-pressures in a sandy seabed were experimentally simulated with a specially-designed flume, which can concurrently generate periodic waves and a following/opposing co-directional current. The effect of a current on the wave profile is firstly examined. The wave steepness is decreased by a following current, but enhanced by an opposing current. Flume observations indicate that, under combined wave-current loading, the wave-induced pore-pressure is increased for the following-current case, but reduced for the opposing-current case. Such wave-current combination effect becomes more significant for shorter wave periods. The variation trend of the excess pore-pressure distribution in the present flume observations is consistent with that of the existing analytical solutions. Nevertheless, due to the existence of wave and/or current boundary layer and non-lineartiy of wave-current interactions as indicated by the flume observations, certain deviations exist between the flume results for excess pore-pressure and the analytical solutions, which can not be ignored especially for the opposing-current case. The effects of the boundary layer on the combined wave-current induced pore-pressures in the seabed are further highlighted by supplementary numerical simulations. A favorable prediction by the analytical solution would be expected for following-current cases and smaller pore-pressure amplitudes would be obtained for opposing-current cases.
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    Journal Title
    COASTAL ENGINEERING
    Volume
    147
    DOI
    https://doi.org/10.1016/j.coastaleng.2019.02.006
    Subject
    Geology
    Oceanography
    Civil engineering
    Publication URI
    http://hdl.handle.net/10072/384011
    Collection
    • Journal articles

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