Transport of Sand and Partly Cohesive Sediments in a Circular Pipe Run Partially Full

Banasiak, Robert; Verhoeven, Ronny

doi:10.1061/(asce)0733-9429(2008)134:2(216)

Cited by 23 publications

(10 citation statements)

References 16 publications

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“…Wang et al 1988;Liang et al 2007). The available data suggest that these mixedsediment bedforms are smaller than in pure sand, even at clay bed fractions below 3% (Basaniak & Verhoeven 2008;Baas et al 2013;Schindler et al 2015;Fig. 8).…”

Section: Bedforms and Primary Current Stratification In Cohesive Sedimentioning

confidence: 96%

Predicting bedforms and primary current stratification in cohesive mixtures of mud and sand

Baas

Best

Peakall

2015

JGS

156

253

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The use of sedimentary structures as indicators of flow and sediment morphodynamics in ancient sediments lies at the very heart of sedimentology, and allows reconstruction of formative flow conditions generated in a wide range of grain sizes and sedimentary environments. However, the vast majority of past research has documented and detailed the range of bedforms generated in essentially cohesionless sediments that lack the presence of mud within the flow and within the sediment bed itself. Yet most sedimentary environments possess fine-grained sediments and recent work has shown how the presence of this fine sediment may substantially modify the fluid dynamics of such flows. It is increasingly evident that understanding the influence of mud, and the presence of cohesive forces, is essential to permit a fuller interpretation of many modern and ancient sedimentary successions. In this paper, the present state of knowledge on the stability of current- and wave-generated bedforms and their primary current stratification is reviewed, and a new extended bedform phase diagram is presented that summarizes the bedforms generated in mixtures of sand and mud under rapidly decelerated flows. This diagram provides a phase space using the variables of yield strength and grain mobility as the abscissa and ordinate axes, respectively, and defines the stability fields of a range of bedforms generated under flows that have modified fluid dynamics owing to the presence of suspended sediment within the flow. Our results also present unique data on a range of bedforms generated in such flows, whose recognition is essential to help interpret such deposits in the ancient sedimentary record, including the following: (1) heterolithic stratification, comprising alternating laminae or layers of sand and mud; (2) the preservation of low-amplitude bed-waves, large current ripples and bed scours with intrascour composite bedforms; (3) low-angle cross-lamination and long lenses and streaks of sand and mud formed by bed-waves; (4) complex stacking of reverse bedforms, mud layers and low-angle cross-lamination on the upstream face of bed scours; (5) planar bedding comprising stacked mud–sand couplets. Furthermore, the results shown herein demonstrate that flow variability is not required to produce deposits consisting of interbedded sand and muds, and that the nature of flaser, wavy and lenticular bedding ( sensu Reineck & Wunderlich 1968) may also need reconsideration in the deposits of such sediment-laden flows.

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Section: Bedforms and Primary Current Stratification In Cohesive Sedimentioning

confidence: 96%

Predicting bedforms and primary current stratification in cohesive mixtures of mud and sand

Baas

Best

Peakall

2015

JGS

156

253

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“…The active layer is much thinner compared to noncohesive sediment with resulting suppressed bedforms -quasi 2D ripples only few millimetres in height (Banasiak & Verhoeven 2008). .…”

Section: Influence Of Cohesionmentioning

confidence: 99%

“…The determination of the effective roughness height k s for the sediment deposit, despite long extensive research efforts, remains one of the major uncertainties. It is typically related to the characteristic size of the sediment, k s ¼ cd x .There are indications that for uniform materials k s can be as low as d 50 or 2d 50(Nikuradse 1933;Song et al 1998;Coleman et al 2003;Banasiak & Verhoeven 2008), but the multiplication factor c is likely to increase with the sediment gradation. The influence of k s on the shear stress according to the Equation 4 is shown inFigure 1; larger k s results in higher effective bed shear stress.Recent studies have also attempted to quantify the influence of bed forms on the shear stress partitioning in sewer pipes Ota & Nalluri (2003).…”

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confidence: 99%

The reliability of sediment transport predictions in sewers: influence of hydraulic and morphological uncertainties

Banasiak

Tait

2008

Water Science and Technology

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The paper is focussed on the concept of defining the "predictability" of sediment transport. Engineers are faced with a number of sediment transport formulas derived from different tests and described as suitable for application in sewers. Bed and suspended load formulas vary in form and performance, generally depending on the data sets that were used to calibrated them. As different sediment types have been tested no single, generally valid formula has been established so far. Formulas are distributed in the scientific literature and are often reported without the information necessary to define their range of potential applicability. Therefore, this paper along with analysing the formulas available, will also comment on the assumptions used in their development as well as the reliability of their underlying data to aid engineers in the selection of the most appropriate sediment transport formulae to correspond with the environment in which they are working.

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“…However, compared with non-cohesive sediment deposits, the cohesive-like properties of sediment have the potential to change erosion response significantly. Organic sediment, the mixture of sand and clay and the real sediment were tested in the flume or pipe to investigate the erosion and transport behaviours of cohesive sediments (Banasiak and Verhoeven, 2008;Juan et al, 2011;Skipworth et al, 1999). Moreover, a number of models have been developed at a laboratory scale to describe sewer sediment deposition, erosion and transport processes in order to predict the pollutant loads in sewers during wet weather events (Willems, 2010).…”

Section: Introductionmentioning

confidence: 99%

Field study of dynamic behaviour of sediment in combined sewer overflow chambers

Zhou¹,

Chen²,

Shao³

2014

Proceedings of the Institution of Civil Engineers - Water Manag

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Knowledge of the build-up and erosion behaviour of sewer sediment is necessary to facilitate better sediment management strategies. The dynamic behaviours of sediment in specific deep combined sewer overflow (CSO) chambers in Liuzhou, China, were studied through a field investigation in this paper. The results presented show that the chambers suffered from sediment problems of varying severity, and the severity depends on the dry weather flow rate. The sediment layers in chambers reached a certain balance with dry and wet weather flow rate, respectively. It can be classified as irreversible and reversible according to its mobility. The former has a low environmental impact because of its limited mobility and low organic content, and its increasing rate is extremely low year by year, whereas the latter has a highly pollutant content, and is the major cause of sewer odour and CSO pollution. The removal of this layer is seen to be a very important aspect of sewer sediment management.

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Transport of Sand and Partly Cohesive Sediments in a Circular Pipe Run Partially Full

Cited by 23 publications

References 16 publications

Predicting bedforms and primary current stratification in cohesive mixtures of mud and sand

Predicting bedforms and primary current stratification in cohesive mixtures of mud and sand

The reliability of sediment transport predictions in sewers: influence of hydraulic and morphological uncertainties

Field study of dynamic behaviour of sediment in combined sewer overflow chambers

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