Modeling (partly) cohesive sediment transport in sewer systems

Berlamont, Jean; Torfs, Hilde

doi:10.2166/wst.1996.0204

Cited by 6 publications

(4 citation statements)

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“…For very small mud fractions (F m < 5%), it appears that the critical shear stress for erosion is lower than that for pure sand (Berlamont & Torfs, 1995). Torfs et al (2001) account for this feature in their formulation of the critical shear stress.…”

Section: Erodability and Sedimentation Of Sand/mud Mixturesmentioning

confidence: 99%

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France): an attempt using a process-based approach

et al. 2007

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The mouth of the Seine River estuary (France) has undergone marked morphological evolution over several decades mainly due to engineering works aimed at improving access to Rouen and Le Havre harbours. The intertidal areas are decreasing in size and the lower estuary is accumulating sediment and prograding. In order to understand and better describe the major morphological behaviours of the estuary, a morphodynamic numerical model was developed within the Seine-Aval program. At the end of the 1st part of the research program, a validated fine sediment transport model (3D) was available (Le Hir et al., 2001b). As the present morphological study addresses medium-term issues (a few decades), and because of the need to investigate impacts of local structures or events, we chose to use the so-called ''process-based approach'' starting from the existing model. First, the existing model was upgraded to account for (suspended) sand transport, and to achieve coupling between morphological changes and sediment transport. Erodability of the sediment accounts for the respective proportions of mud and sand. Simulations starting from an arbitrary surficial sediment cover show that the model is able to reproduce realistic sediment patterns. For example, it is able to change the sediment nature on the intertidal flat near Le Havre from sand to mud. Observed structures of suspended sediment are also reproduced: fine particles mainly follow the turbidity maximum whereas significant concentrations of sand grains in suspension are found where the hydrodynamic stresses are intense. Concerning morphodynamics, simulations with real forcing over one year are discussed. The effect of waves on the bathymetric evolution of the mouth is shown and the sensitivity of morphodynamics to the coupling procedure is tested.

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Section: Erodability and Sedimentation Of Sand/mud Mixturesmentioning

confidence: 99%

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France): an attempt using a process-based approach

et al. 2007

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“…As it is mentioned by Berlamont & Torfs (1996), experimental research on the erosion of mixed sediments (Torfs, 1994, Williamson & Torfs,1996 showed an increasing erosion resistance with increasing content of cohesive material.…”

Section: Introductionmentioning

confidence: 89%

Wind effect on bottom shear stress, erosion and redeposition on Zostera noltei restoration in a coastal lagoon; part 2

Alekseenko

Roux

2019

Estuarine, Coastal and Shelf Science

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“…Panagiotopoulos et al, 1997;van Ledden et al, 2004;Le Hir et al, 2011). Select studies have shown that fluvial erosion strength can increase several-fold when appropriate amounts of sand (~60%) and clay (~10%) are mixed and cement together, enhancing the armoring (Williamson and Ockenden, 1993;Torfs, 1995;Berlamont and Torfs, 1996;van Ledden et al, 2004).…”

Section: Critical Shear Stress For Mass Fluvial Erosionmentioning

confidence: 99%

Understanding mass fluvial erosion along a bank profile: using PEEP technology for quantifying retreat lengths and identifying event timing

Papanicolaou

Wilson

Tsakiris

et al. 2017

Earth Surf Processes Landf

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This study provides fundamental examination of mass fluvial erosion along a stream bank by identifying event timing, quantifying retreat lengths, and providing ranges of incipient shear stress for hydraulically driven erosion. Mass fluvial erosion is defined here as the detachment of thin soil layers or conglomerates from the bank face under higher hydraulic shear stresses relative to surface fluvial erosion, or the entrainment of individual grains or aggregates under lower hydraulic shear stresses. We explore the relationship between the two regimes in a representative, US Midwestern stream with semi‐cohesive bank soils, namely Clear Creek, IA. Photo‐Electronic Erosion Pins (PEEPs) provide, for the first time, in situ measurements of mass fluvial erosion retreat lengths during a season. The PEEPs were installed at identical locations where surface fluvial erosion measurements exist for identifying the transition point between the two regimes. This transition is postulated to occur when the applied shear stress surpasses a second threshold, namely the critical shear stress for mass fluvial erosion. We hypothesize that the regimes are intricately related and surface fluvial erosion can facilitate mass fluvial erosion. Selective entrainment of unbound/exposed, mostly silt‐sized particles at low shear stresses over sand‐sized sediment can armor the bank surface, limiting the removal of the underlying soil. The armoring here is enhanced by cementation from the presence of optimal levels of sand and clay. Select studies show that fluvial erosion strength can increase several‐fold when appropriate amounts of sand and clay are mixed and cement together. Hence, soil layers or conglomerates are entrained with higher flows. The critical shear stress for mass fluvial erosion was found to be an order of magnitude higher than that of surface fluvial erosion, and proceeded with higher (approximately 2–4 times) erodibility. The results were well represented by a mechanistic detachment model that captures the two regimes. Copyright © 2017 John Wiley & Sons, Ltd.

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Modeling (partly) cohesive sediment transport in sewer systems

Cited by 6 publications

References 0 publications

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France): an attempt using a process-based approach

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France): an attempt using a process-based approach

Wind effect on bottom shear stress, erosion and redeposition on Zostera noltei restoration in a coastal lagoon; part 2

Understanding mass fluvial erosion along a bank profile: using PEEP technology for quantifying retreat lengths and identifying event timing

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