Laboratory analysis of armor layer development in a local scour around a groin

Török, Gergely T.; Baranya, Sándor; Rüther, Nils; Spiller, Stephan Mark

doi:10.1201/b17133-194

Cited by 13 publications

(33 citation statements)

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“…The paper pointed out that the significant part of the bed erosion took place until 2006, mainly between rkm 1800 and rkm 1812. The deposition of the eroded sediments is a somewhat lower process [11]. However, Holubova et al [19] found that aggradation occurred between rkm 1770 and rkm 1800, but considerable bed level rise could not be detected since 2006.…”

Section: Typical Morphological Changes After the Construction Of The mentioning

confidence: 99%

“…In the remaining two cross-sections, however, the coarsest sample was found at the left bank side, which in fact characterizes the Vének ford. This phenomenon can be explained by the selective erosion process [11], i.e. if the bedload particles arrive in a place with lower bed shear stress than upstream, the coarser and maybe the finer grains find a more stable place.…”

Section: Morphological Investigation Based On Flowmeasurementsmentioning

confidence: 99%

“…Indeed, these measures had major effects on the local bed morphology, e.g. local scouring and bed material coarsening at the groins heads, and deposition of fine material between and downstream of the groins [11]. Figure 2 shows the navigation map regarding to the examined river reach.…”

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confidence: 99%

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Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

Török

Baranya

2017

Period. Polytech. Civil Eng.

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Section: Typical Morphological Changes After the Construction Of The mentioning

confidence: 99%

Section: Morphological Investigation Based On Flowmeasurementsmentioning

confidence: 99%

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Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

Török

Baranya

2017

Period. Polytech. Civil Eng.

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“…Since this method does not disturb the bed surface, it is more suitable to check the bed composition changes at the intermediate equilibrium stages. There are, however, differences [19].…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the hydraulic and sediment conditions of the benchmark experiments determine the applicability limits of the formulas, Figure 1. The interpretation of the local coordinate system [19].…”

Section: Introductionmentioning

confidence: 99%

3D CFD Modeling of Local Scouring, Bed Armoring and Sediment Deposition

Török

Baranya

Rüther

2017

Water

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3D numerical models are increasingly used to simulate flow, sediment transport and morphological changes of rivers. For the simulation of bedload transport, the numerical flow model is generally coupled with an empirical sediment transport model. The application range of the most widely used empirical models is, however, often limited in terms of hydraulic and sedimentological features and therefore the numerical model can hardly be applied to complex situations where different kinds of morphological processes take place at the same time, such as local scouring, bed armoring and aggradation of finer particles. As a possible solution method for this issue, we present the combined application of two bedload transport formulas that widens the application range and thus gives more appropriate simulation results. An example of this technique is presented in the paper by combining two bedload transport formulas. For model validation, the results of a laboratory experiment, where bed armoring, local scouring and local sediment deposition processes occurred, were used. The results showed that the combined application method can improve the reliability of the numerical simulations.

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A comparison between advanced hybrid machine learning algorithms and empirical equations applied to abutment scour depth prediction

Khosravi

Khozani

Mao

2021

Journal of Hydrology

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Complex vortex flow patterns around bridge piers, especially during floods, cause scour process that can result in the failure of foundations. Abutment scour is a complex three-dimensional phenomenon that is difficult to predict especially with traditional formulas obtained using empirical approaches such as regressions. This paper presents a test of a standalone Kstar model with five novel hybrid algorithm of bagging (BA-Kstar), dagging (DA-Kstar), random committee (RC-Kstar), random subspace (RS-Kstar), and weighted instance handler wrapper (WIHW-Kstar) to predict scour depth (ds) for clear water condition. The dataset consists of 99 scour depth data from flume experiments (Dey and Barbhuiya, 2005) using abutment shapes such as vertical, semicircular and 45° wing. Four dimensionless parameter of relative flow depth (h/l), excess abutment Froude number (Fe), relative sediment size (d50/l) and relative submergence (d50/h) were considered for the prediction of relative scour depth (ds/l). A portion of the dataset was used for the calibration (70%), and the remaining used for model validation.Pearson correlation coefficients helped deciding relevance of the input parameters combination and finally four different combinations of input parameters were used. The performance of the models was assessed visually and with quantitative metrics. Overall, the best input combination for vertical abutment shape is the combination of Fe, d50/l and h/l, while for semicircular and 45° wing the combination of the Fe and d50/l is the most effective input parameter combination. Our results show that incorporating Fe, d50/l and h/l lead to higher performance while involving d50/h reduced the models prediction power for vertical abutment shape and for semicircular and 45° wing involving h/l and d50/h lead to more error. The WIHW-Kstar provided the highest performance in scour depth prediction around vertical abutment shape while RC-Kstar model outperform of other models for scour depth prediction around semicircular and 45° wing.

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Laboratory analysis of armor layer development in a local scour around a groin

Cited by 13 publications

References 3 publications

Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

3D CFD Modeling of Local Scouring, Bed Armoring and Sediment Deposition

A comparison between advanced hybrid machine learning algorithms and empirical equations applied to abutment scour depth prediction

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