Unfluidized soil responses of a silty seabed to monochromatic waves

Tzang, Shiaw-Yih

doi:10.1016/s0378-3839(98)00039-8

Cited by 44 publications

(12 citation statements)

References 16 publications

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“…In the dense seabed with relative density around 60%, the soil liquefied to an intermediate depth. This was also observed by [16] in silt and [17] in sandy bed.…”

Section: Literature Reviewsupporting

confidence: 52%

Pore Pressure Response of Clayey Seabed Under Ocean Wave

Wang¹

2014

geomate

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ABSTRACT:In this study, a 2-D quasi-dynamic u-w-p model is developed to examine the wave-induced clayey seabed behavior. Further, this paper aims to provide a better understanding of the unstable condition of clayey seabed in the vicinity of coastal structure. In the proposed u-w-p model, acceleration, velocity, and displacement terms are considered different for both solid and fluid phases. The governing equations of u-wp model are determined from constitutive law and conservation law under certain assumptions. The numerical solutions are developed by using Finite Difference Method (FDM) and three outputs (pore water pressure, effective vertical stress and shear stress) are analyzed. The result shows that both liquefaction and shear failure have low potential to occur in clayey seabed, this is due to by the soil structure and low permeability of clay. The pore water pressure vary linearly according to the depth, however, this variation is not significant in clayey seabed. In addition, there is no phase lag in clayey seabed. This paper presents the findings on wave induced stress variation in seabed with fine-grained soil, which differs to some of the published literature on sandy seabed.

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“…In the dense seabed with relative density around 60%, the soil liquefied to an intermediate depth. This was also observed by [16] in silt and [17] in sandy bed.…”

Section: Literature Reviewsupporting

confidence: 52%

Pore Pressure Response of Clayey Seabed Under Ocean Wave

Wang¹

2014

geomate

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“…In the recent decades, the wave induced seabed response has been extensively investigated by analytical approximations [6][7][8], laboratory experiments [9,10] and numerical simulations [8,[11][12][13][14][15]. In the aforementioned studies, the fluctuation due to dynamic wave pressure on the seabed floor has been recognized as the dominant factor in analyzing the seabed response.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Seabed Response to Combined Wave-Current Loading

Zhang

et al. 2013

Journal of Offshore Mechanics and Arctic Engineering

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In this paper, a numerical model is developed to study the dynamic response of a porous seabed to combined wave-current loadings. While the Reynolds-averaged Navier-Stokes equations with k -& turbulence closure scheme and internal wave-maker function are solved for the phenomenon of wave-current interaction, Biot's poro-elastic "u-p" model is adopted for the seabed response. After validated by the laboratory measurements, this model is applied for the investigation of the effects of waves and currents on the wave-current induced pore pressures. Furthermore, the effects of currents on maximum liquefaction depths of a porous seabed is examined, and it is concluded that the opposite currents will increase the liquefaction depth up to 30% of that without currents. Journal of Offshore Mechanics and Arctic Engineering

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“…SPA refers to a process that fine‐grained sediments are transported vertically by upwelling seepage flows from the interior to the surface of the fluidized deposits, which is exactly the physical mechanism of “micromud volcanoes” appeared on the surface. As the pore fluid velocities are sufficient to detach the fines from the soil skeletons (Di Felice, ), “internal suspension” (Tzang, ) occurs; furtherly, when the pore fluid velocities are sufficient to transport the detached fines between the soil skeletons, “SPA” occurs. This process will surely add the fine content to the surface sediments and thus enlarge the Shield parameter (Shields, ), finally contribute to the increase of sediment erodibility.…”

Section: Discussionmentioning

confidence: 99%

“…Critical shear stress for erosion (s cr ) and erosion rate (E r ) are the two most important parameters to characterize erodibility. In general, erosion rate is assumed to be proportional to the excess of bottom shear stress (s b ) above the s cr (Neumeier et al, 2008;van Rijn, 1989). Previous research indicated that s cr is related to site-specific characteristics of the sediments, including the particle grain size, density, cohesiveness, water content, and biological binding (Sanford & Maa, 2001).…”

Section: Introductionmentioning

confidence: 99%

Influence of Seepage Flows on the Erodibility of Fluidized Silty Sediments: Parameterization and Mechanisms

et al. 2018

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The influence of seabed fluidization on the erosion of cohesive sediment has been well recognized, however, quantitative parameterization works are rather difficult and remain poorly understood. Therefore, case studies are still needed to achieve better results even locally. Silty seabed in the Yellow River Delta (YRD) has been exposed to frequent fluidization and serious erosion. The present paper attempts to advance the research progress on the influence of fluidization on erosion using an annular flume and the YRD silts as a case study. Erosion coefficients are found to increase from 8.27 × 10−5 to 5.44 × 10−4 kg normalm−2 normals−1, corresponding to fluidization degrees from 0.03 to 0.96. Erodibility may increase by 6–7 times when the bottom sediments are fluidized. The significant influence is successfully parameterized into the erosion coefficient of the linear erosion formulation. Both direction and magnitude of the seepage flows dominate the erodibility of fluidized silts. Infiltration inhibits while upward seepage enhances entrainment of fluidized sediments, specifically via (a) loss of the original cohesive force between soil particles, (b) uplifting seepage forces acting onto the sediments at the water‐seabed interface, which partially offset the particle gravity, and (c) seepage pumping of fines from the interior to the surface, which enlarges the surface Shield parameter.

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Unfluidized soil responses of a silty seabed to monochromatic waves

Cited by 44 publications

References 16 publications

Pore Pressure Response of Clayey Seabed Under Ocean Wave

Pore Pressure Response of Clayey Seabed Under Ocean Wave

Numerical Modeling of Seabed Response to Combined Wave-Current Loading

Influence of Seepage Flows on the Erodibility of Fluidized Silty Sediments: Parameterization and Mechanisms

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