Combining Turbulence and Mud Rheology in a Conceptual 1DV Model – An advanced continuous modeling concept for fluid mud dynamics

Chmiel, Oliver; Naulin, M.; Malcherek, Andreas

doi:10.18171/1.089101

2020

DOI: 10.18171/1.089101

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Combining Turbulence and Mud Rheology in a Conceptual 1DV Model – An advanced continuous modeling concept for fluid mud dynamics

Oliver Chmiel¹,

M. Naulin²,

Andreas Malcherek³

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“…Chmiel et al (2020) have shown how the k- E model is able to work in fluid mud and sediment layers and results in  0 E k for high concentrations. The turbulence model by Wilcox (1988) and adapted from Chmiel et al (2020) is…”

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Using a Holistic Modeling Approach to Simulate Mud‐Induced Periodic Stratification in Hyper‐Turbid Estuaries

Schmidt

Malcherek

2021

Geophysical Research Letters

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In some estuaries, deepening and dredging caused a shift to very high sediment concentrations resulting in thick layers of fluid mud. Examples for such hyper-turbid estuaries are the Ems, Loire and Yangtze river. The Ems estuary is located at the German-Dutch border, see Figure 1a, with main riverine inputs from Ems () and Leda (). Intensive dredging of the river has changed the flow profile such that the flood phase, compared to the ebb phase, is shorter, with higher velocities and acceleration. This led to an over 40 km long estuarine turbidity maximum (ETM) and the formation of a thick fluid mud layer with concentrations up to several tens to hundreds of grams per liter (Schrottke, 2006;Talke et al., 2009). Recent measurements of Becker et al. (2018a) show strongly varying concentration and velocity profiles over a tidal cycle. The processes occurring in the Ems are illustrated in Figure 1b which shows the concentration of suspended sediment over a tidal cycle in the estuary. During flood tide (position A), intense mixing occurs and the sediment concentration profile increases almost linearly from the free surface to the consolidated mud layer at the bottom. A shear layer is located near the bed, above the lower pronounced density gradient (lutocline). During slack water (position B) the sediment in the upper layer settles down and a two-layer flow forms, divided by a second lutocline. The rapid change in the concentration profile can be explained with turbulence damping due to stratification, which reduces vertical mixing and in turn leads to increased settling. The position of the largest density gradient moves upwards from the consolidated mud interface to the fluid mud-water interface. This restratification is related to damping of turbulent mixing processes.

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Using a Holistic Modeling Approach to Simulate Mud‐Induced Periodic Stratification in Hyper‐Turbid Estuaries

Schmidt

Malcherek

2021

Geophysical Research Letters

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“…Recently, Oberrecht (2021) applied this continuous modeling approach to the Delft3D model and simulated fluid mud processes in the Ems estuary. Chmiel et al (2021) developed a vertical one-dimensional model by modifying the kw turbulence model (Wilcox, 1988) to reproduce the vertical mixing from the fluid mud layer to the water layer, and Schmidt and Malcherek (2021) applied the model to the Ems estuary and obtained satisfactory simulation results.…”

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Modelling of fluid mud flow based on a three-dimensional hydrodynamic model : incorporating a 3D rheological model

Shi,

Zhang,

Zhang

et al. 2024

Front. Mar. Sci.

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Modeling fluid mud in estuaries and coastal areas is a complicated task due to its non-Newtonian characteristics. A continuous modeling approach was adopted to investigate the laminar flow of fluid mud, with a three-dimensional (3D) form of the Herschel–Bulkley rheological model introduced into the finite volume coastal ocean model (FVCOM) to calculate the apparent viscosity of fluid mud. The model was validated against two flume experiments for the laminar flow of fluid mud. The results showed that the developed model was capable of accurately reflecting the continuous distribution of velocity and density from the near-bottom to the upper water column. Based on the validated model, the difference between the 3D rheological model and a 1DV rheological model on the simulation results was assessed. The study found the results of the 1DV model and the 3D model show obvious differences. This illustrates the significant effect of apparent viscosity in horizontal direction taken into account by the 3D rheological model.

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Combining Turbulence and Mud Rheology in a Conceptual 1DV Model – An advanced continuous modeling concept for fluid mud dynamics

Cited by 2 publications

References 0 publications

Using a Holistic Modeling Approach to Simulate Mud‐Induced Periodic Stratification in Hyper‐Turbid Estuaries

Using a Holistic Modeling Approach to Simulate Mud‐Induced Periodic Stratification in Hyper‐Turbid Estuaries

Modelling of fluid mud flow based on a three-dimensional hydrodynamic model : incorporating a 3D rheological model

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