Experimental investigation of wave-driven pore-water pressure and wave attenuation in a sandy seabed

Zhang, Jisheng; Li, Qianzhen; Ding, Cong; Zheng, Jinhai; Zhang, Tiantian

doi:10.1177/1687814016651207

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…It can be clearly seen that the measured excess pore-pressure amplitudes decrease abruptly as the backfilled depth increases from 0 to D. The primary reason for this could be that the wave-induced excess pore-water pressure around the pipeline decreases with increasing backfilled depth at certain backfilled depths. This is consistent with previous studies [39]. The amplitude of the excess pore pressure in the vicinity of the pipeline increases significantly as the backfilled depth increases from D to 9D/4.…”

Section: Effects Of Backfilled Depthsupporting

confidence: 93%

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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The phenomenon of wave-seabed-pipeline interactions is one of the primary concerns of coastal engineers and researchers, as it could greatly affect the seabed instability and pipeline safety. Numerous researchers have expended great effort in studying wave-seabed-pipeline interactions in the past. However, the majority of them focussed on the wave-induced response around a submarine pipeline, in buried conditions, by numerical models and laboratory experiments. Unlike the previous studies, a series of regular wave experiments and numerical model analyses were conducted to investigate the wave-induced pore pressure in the sandy seabed, around a pipeline with different backfilled depths. The model pipeline with three diameters (D = 6 cm, 8 cm, and 10 cm) is buried in three sizes of sand, d50=0.15 mm, d 50 =0.3 mm, and d 50 =0.5 mm, with different backfilled depths. The results show that the pore pressure amplitude in the seabed is a minimum with a backfilled depth D, and a maximum with full backfill or a backfilled depth of zero. The pore-pressure amplitude increases as the backfill sand median diameter increases. The effects of the pipeline diameter on pore-water pressure are also analysed and discussed.

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Section: Effects Of Backfilled Depthsupporting

confidence: 93%

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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“…With the same framework, Hsu and Jeng (1994) later derived the analytical solution to Biot's equations for the case of finite soil thickness, which can converge to the above solution by Yamamoto et al (1978) and Madsen (1978) if the soil thickness approaches infinity. The validity of these analytical solutions have been confirmed by both one-dimensional tests using cylindrical-shaped apparatuses (Chowdhury et al, 2006;Liu et al, 2015) and flume experiments (Tsui and Helfrich, 1983;Chang et al, 2007;Zhang et al, 2016;Zhai et al, 2018). A detailed review of the previous investigations on the wave-seabed interaction can be found in Jeng (2003;2013;2018).…”

Section: Introductionmentioning

confidence: 60%

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

Jeng

et al. 2019

Coastal Engineering

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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 porepressures 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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“…Since the 1950s, numerous experimental studies have been performed to characterize the damping of waves on porous structures. Savage was one of first research scientists to study the wave interaction with a permeable seabed, modeling the engineered solution based on porous bed in an open channel 21‐26 . One of first works on the engineered solution using gabion weir has been given by Stephenson 27‐30 .…”

Section: Introductionmentioning

confidence: 99%

Modified incompressible smooth particle hydrodynamics in porous media method for modeling the damping of a waves train on an inclined porous structure

Ortega

Beaudoin

2021

Numerical Methods in Fluids

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In this work, the ISPHP method proposed by Akbari and Namin in 2013 has been modified by implementing the Taylor expansion of a classical smoothing function. The modified ISPHP method with the Taylor expansion of the smoothing function, the optimization of the solving of Poisson's equation and the wave maker, has been used to simulate the damping of a waves train on an inclined porous structure. The comparison between the numerical results obtained with the modified ISPHP method and the experimental data obtained by Carrasco et al. in 2020 has shown on the one hand that the modified ISPHP method could be used to study the damping of a waves train on an inclined porous structure and on the other hand that the dimensionless number χ could be used to characterize the energy transformations of the interaction of a waves train and an inclined porous structure.

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Experimental investigation of wave-driven pore-water pressure and wave attenuation in a sandy seabed

Cited by 14 publications

References 22 publications

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

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

Modified incompressible smooth particle hydrodynamics in porous media method for modeling the damping of a waves train on an inclined porous structure

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