Fluidization and representative wave transformation on muddy beds

Soltanpour, Mohsen; Haghshenas, S. Abbas

doi:10.1016/j.csr.2008.09.016

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…The wave height attenuation rate k i can be calculated by this model. Details of the mud fluidization sub-model and the wave-mud interaction sub-model have been provided in Soltanpour and Haghshenas (2009).…”

Section: Dissipation By Mudmentioning

confidence: 99%

An analysis of wave dissipation at the Hendijan mud coast, the Persian Gulf

Haghshenas

Soltanpour

2010

Ocean Dynamics

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Effects of non-rigid muddy bed on the wave climate at the Hendijan coast along the northwestern part of the Persian Gulf have been examined through field measurements and numerical wave transformation modeling. The field survey included measurements of wave characteristics at an offshore and a nearshore station, and mud sampling to obtain the thickness of the fluid mud layer and its rheological properties. Comparisons of wave spectra at the two stations show energy dissipation along the wave trajectory with higher dissipation in the wave period band around 6 s, because depending on the site a given frequency band tends to be more effective in wave-mud interaction. Dissipation induced by the non-rigid bed is introduced into the REF/DIF wave transformation model through the application of viscoelastic constitutive equations for fluid mud. Numerical outputs of the nearshore wave height, for which the viscoelastic parameters included in the model were obtained independently from oscillatory frequencysweep tests, are found to be comparable with measured values at the nearshore station. This implies that the model is useful for estimating the design wave conditions in the study area.

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Section: Dissipation By Mudmentioning

confidence: 99%

An analysis of wave dissipation at the Hendijan mud coast, the Persian Gulf

Haghshenas

Soltanpour

2010

Ocean Dynamics

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“…In our model predictions, we have adopted the water depth at the first wave gauge station in each experiment. All other model inputs, such as mud properties (d , ρ m , ν m , E m ), are taken from the field studies [2,[4][5][6]23]. Table 1 summarizes the parameters used in our model predictions.…”

Section: Comparisons With Field Observationsmentioning

confidence: 99%

Theoretical Model for Nonlinear Long Waves over a Thin Viscoelastic Muddy Seabed

Chan

2022

Mathematics

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We theoretically analyzed the interaction between surface water waves and a thin muddy seabed. Wave motion in the inviscid water layer was assumed to be irrotational and the soft mud was modeled as a linear viscoelastic fluid. Under the Boussinesq approximation for nonlinear long waves, we present a set of depth-integrated equations that can be solved for the depth-averaged horizontal water particle velocity and the free-surface displacement. The long wave model needs to be solved numerically in general. For the cases of linear progressive waves and solitary waves, further analytical solutions were obtained. The model-predicted wave amplitude attenuation rate was shown to reasonably agree with the field data. Our analysis suggests that the elasticity of mud can potentially enhance the wave damping efficiency of a muddy seabed. The present formulations generalize several existing linear and nonlinear models for the wave–mud problem reported in literature.

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“…In fact, muddy seafloors have been observed in many marine environments where the obstacles of interest may appear for various engineering purposes [42]. Field samples have also revealed that the flow and deformation characteristics of muddy deposits are fundamentally different from those of noncohesive sediment particles [42,66,67]. Hence, we believe that it is necessary to carefully examine the effects of a muddy seabed on wave scattering by an obstacle.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation into the Effects of a Viscous Fluid Seabed on Wave Scattering with a Fixed Rectangular Obstacle

2022

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We study numerically the effects of a viscous fluid seabed on wave scattering with a solid obstacle of rectangular shape fixed at the free surface, on the seafloor, or internally within the water layer. The computational model is based on OpenFOAM and it is validated using existing analytical solutions for waves encountering an obstacle on a solid bed and available experimental data for waves propagating over a muddy seabed with no obstacles. With the consideration of a solid obstacle on a viscous fluid bottom, we examine the corresponding transformations of incident, reflected, and transmitted wave components. The velocity field near the obstacle and the wave forces exerted on the obstacle are also analyzed. Our simulations show that all wave components experience significant amplitude attenuation caused by the viscous fluid bed. For both surface and bottom obstacles, the presence of an obstacle enhances the damping of reflected waves. When an internally submerged obstacle is considered, transmitted waves are the most affected due to a prominent vortex generated in the lee of the obstacle. Patterns of the velocity field in the vicinity of the obstacle are shown to be controlled mainly by the obstacle with some modulations in magnitude and wavelength contributed by the viscous fluid bed. In view of the vertical wave force on the obstacle surface, both a phase shift and decrease in magnitude are observed. These findings enhance our understanding of the underlying physical processes in the wave–obstacle–mud problems. More studies are still needed in order to provide the necessary technical tools for the engineering design of coastal structures in muddy marine environments.

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Fluidization and representative wave transformation on muddy beds

Cited by 9 publications

References 10 publications

An analysis of wave dissipation at the Hendijan mud coast, the Persian Gulf

An analysis of wave dissipation at the Hendijan mud coast, the Persian Gulf

Theoretical Model for Nonlinear Long Waves over a Thin Viscoelastic Muddy Seabed

Numerical Investigation into the Effects of a Viscous Fluid Seabed on Wave Scattering with a Fixed Rectangular Obstacle

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