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Search Results (4)

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Keywords = wave–current–mud interaction

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24 pages, 12144 KB  
Article
Numerical Investigation of the Sediment Load Exchange between a Coastal Mud Bank and Its Neighbouring Estuary
by Noelia Abascal-Zorrilla, Nicolas Huybrechts, Sylvain Orseau, Vincent Vantrepotte, Edward Anthony and Antoine Gardel
Water 2024, 16(20), 2885; https://doi.org/10.3390/w16202885 - 11 Oct 2024
Viewed by 1812
Abstract
Muddy coastlines cover much of the world’s shores, yet studies on the interaction between mud-affected coasts and estuaries are limited. This study focuses on the Mahury River estuary and its interaction with the muddy coast of the Guianas, primarily fed by the Amazon. [...] Read more.
Muddy coastlines cover much of the world’s shores, yet studies on the interaction between mud-affected coasts and estuaries are limited. This study focuses on the Mahury River estuary and its interaction with the muddy coast of the Guianas, primarily fed by the Amazon. A coupled wave–current–sediment transport model is developed to analyze the sediment exchange in an environment with strong interactions between the waves and the fluid mud. Simulations explore how seasonal changes in waves, mud availability, and tides affect sediment fluxes. The main processes influencing suspended particulate matter (SPM) and sediment transport are well emulated, notwithstanding the complexity of the ambient muddy environment. The results show that during the rainy season, strong wave damping and wave refraction zones cause high SPM resuspension in shallow waters (<5 m). In contrast, during the dry season, wave influence shifts to the estuary mouth. Erosion and sedimentation patterns indicate that ebb currents associated with neap tides during the rainy season represent the most favourable conditions for the alongshore migration of mud banks. Neaptide ebb currents also contribute to sedimentation during the dry season but only in the estuary mouth and the nearby coastal area. The abundance of mud leads to an extension of the estuary’s intertidal area during the dry season. Full article
(This article belongs to the Special Issue Hydrodynamics and Sediment Transport in the Coastal Zone)
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25 pages, 1223 KB  
Article
Nonlinear Wave Evolution in Interaction with Currents and Viscoleastic Muds
by Elham Sharifineyestani and Navid Tahvildari
J. Mar. Sci. Eng. 2021, 9(5), 529; https://doi.org/10.3390/jmse9050529 - 14 May 2021
Cited by 4 | Viewed by 2712
Abstract
A numerical model is extended to investigate the nonlinear dynamics of surface wave propagation over mud in the presence of currents. A phase-resolving frequency-domain model for wave-current interaction is improved to account for wave modulations due to viscoelastic mud of arbitrary thickness. The [...] Read more.
A numerical model is extended to investigate the nonlinear dynamics of surface wave propagation over mud in the presence of currents. A phase-resolving frequency-domain model for wave-current interaction is improved to account for wave modulations due to viscoelastic mud of arbitrary thickness. The model compares well with published laboratory data and performs slightly better than the model with viscous mud-induced wave damping mechanism. Monochromatic and random wave simulations are conducted to examine the combined effect of currents, mud-induced wave dissipation and modulation, and nonlinear wave-wave interactions on surface wave spectra. Results indicate that current effects on wave damping over viscoelastic mud is not as straightforward as that over viscous mud. For example, while opposing currents consistently increase damping of random waves over viscous mud, they can decrease damping over viscoelastic mud due to high variations in frequency-dependent damping stemming from mud’s elasticity. It is shown that a model that assumes the mud layer to be thin for simplification can overestimate wave damping over thick mud layers. Full article
(This article belongs to the Section Coastal Engineering)
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28 pages, 7739 KB  
Article
An Analytical Study on Wave-Current-Mud Interaction
by S. Hadi Shamsnia and Denys Dutykh
Water 2020, 12(10), 2899; https://doi.org/10.3390/w12102899 - 17 Oct 2020
Cited by 6 | Viewed by 3118
Abstract
This study aims at providing analytical investigations to the first and second-order on the wave–current–mud interaction problem by applying a perturbation method. Direct formulations of the wave–current–mud interaction could not be found in the literature. Explicit formulations for the particle velocity, dissipation rates, [...] Read more.
This study aims at providing analytical investigations to the first and second-order on the wave–current–mud interaction problem by applying a perturbation method. Direct formulations of the wave–current–mud interaction could not be found in the literature. Explicit formulations for the particle velocity, dissipation rates, and phase shift in the first order and the mass transport in the second-order have been obtained. The findings of the current study confirmed that by an increase in the current velocity (e.g., moving from negative to positive values of current velocity), the dissipation rates and mud (instantaneous and mean) velocity decrease. The proposed assumption of a thin mud layer (boundary layer assumption) matches with the laboratory data in the mud viscosity of the orders of (0.01 N/m2) in both wave dissipation and mud mass transport leading to small ranges of discrepancies. The results from the newly proposed model were compared with the measurements and the results of an existing model in the literature. The proposed model showed better agreements in simulating the mud (instantaneous and mean) velocity compared to the existing one. Full article
(This article belongs to the Special Issue Mathematical Modeling of Sediment Transport in Coastal Areas)
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31 pages, 7891 KB  
Article
A Study of Wave Dissipation Rate and Particles Velocity in Muddy Beds
by S. Hadi Shamsnia, Mohsen Soltanpour, Majid Bavandpour and Carlo Gualtieri
Geosciences 2019, 9(5), 212; https://doi.org/10.3390/geosciences9050212 - 10 May 2019
Cited by 7 | Viewed by 3519
Abstract
The interactions between free surface waves and layers of cohesive sediments including wave height attenuation and mud movement are of great importance in coastal and marine engineering. In this study, the results from a new analytical model were compared with those from literature [...] Read more.
The interactions between free surface waves and layers of cohesive sediments including wave height attenuation and mud movement are of great importance in coastal and marine engineering. In this study, the results from a new analytical model were compared with those from literature experimental works and analytical models in terms of wave height dissipation rate and mud velocity. It was found that the new model provided good agreements in the case of coexisting waves and currents, while the literature model of Ng (explained in Section 2 of the text) —assuming the mud layer as a highly viscous layer with high shear rates—matched well with the experimental data for high viscosity (mud viscosity, νm = O [0.01 m2/s]). In addition, it was found that the new model is able to successfully simulate particles velocity in the presence of co-current. Full article
(This article belongs to the Special Issue Beyond the Channel—Investigating Processes at Crucial Fluvial Interfaces)
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