Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

Török, Gergely T.; Baranya, Sándor

doi:10.3311/ppci.10530

Cited by 13 publications

(48 citation statements)

References 11 publications

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“…Accordingly, a stable bed surface is expected both in the laboratory and in the field study. However, this is only the case for the armored sections of the study sites (blue diamonds) [17,59,64], whereas the bed load measurements of the laboratory experiments and the bed load rating curve at the study site in the Danube River demonstrate that weak bed load transport took place in both cases. Moreover, the bed load material investigation of the laboratory experiment suggested that the bed contained mainly sand fractions.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the blue diamonds located above the line represent the stable [17,59,64] main stream with coarse grains. Because of the armored bed surface, weak sediment transport occurs during mean flow discharge.…”

Section: Resultsmentioning

confidence: 99%

“…No bed load sampling could be performed during the two measurement campaigns. However, the bed load rating curve at the closest monitoring station (6 km upstream) [17] represents that low, but not negligible, bed load transport took place during both measurements (Q b < 0.1 kg/s).…”

Section: Description Of the Validation Measurementsmentioning

confidence: 87%

“…Table A1. Measured morphodynamic data of field [17,64] (at the introduced reach of the Danube River in Hungary) and laboratory [59] measurements and of the referenced laboratory experiments [17,59,64].…”

Section: Discussionmentioning

confidence: 99%

“…At this section, the middle course resulted in a meandering pattern type, with nonuniform bed material (d 50 ranges between 0.32 and 70.5 mm) [9,12]. Furthermore, conventional river regulation measures (e.g., groin fields) were installed, which further enhanced the diversity of the morphological properties and processes [13][14][15][16][17]. The following parameters characterize the river: the main channel width at mean water regime ranges between 150 m and 350 m; the average water surface gradient is around 0.0002-0.00025 [17], whereas the characteristic flow discharges are Q m = 2000 m 3 /s (mean flow), Q bf = 4300-4500 m 3 /s (range of bankfull discharge), Q 100 = 10,400 m 3 /s (100 year flood event) [18] and Q 200 =~10,800 m 3 /s (200 year flood event) [19].…”

Section: Case Studymentioning

confidence: 99%

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A Shear Reynolds Number-Based Classification Method of the Nonuniform Bed Load Transport

Török

Józsa

Baranya

2019

Water

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The aim of this study is to introduce a novel method which can separate sand- or gravel-dominated bed load transport in rivers with mixed-size bed material. When dealing with large rivers with complex hydrodynamics and morphodynamics, the bed load transport modes can indicate strong variation even locally, which requires a suitable approach to estimate the locally unique behavior of the sediment transport. However, the literature offers only few studies regarding this issue, and they are concerned with uniform bed load. In order to partly fill this gap, we suggest here a decision criteria which utilizes the shear Reynolds number. The method was verified with data from field and laboratory measurements, both performed at nonuniform bed material compositions. The comparative assessment of the results show that the shear Reynolds number-based method operates more reliably than the Shields–Parker diagram and it is expected to predict the sand or gravel transport domination with a <5% uncertainty. The results contribute to the improvement of numerical sediment transport modeling as well as to the field implementation of bed load transport measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Description Of the Validation Measurementsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Case Studymentioning

confidence: 99%

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A Shear Reynolds Number-Based Classification Method of the Nonuniform Bed Load Transport

Török

Józsa

Baranya

2019

Water

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Windowed anisotropic local inverse distance-weighted (WALID) interpolation method for riverbed mapping

Fleit

2024

Acta Geophys.

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Digital elevation models (DEMs) are pivotal in river engineering and management, making their accuracy paramount. This paper introduces a novel interpolation method that addresses the challenges of data point distributions, anisotropic river topography, and meandering rivers. The windowed anisotropic local inverse distance-weighted (WALID) method is tested and compared with conventional methods through a case study. Elevation data are generated from multi-beam echosounder data to mimic conventional cross-sectional measurements, while ground truth data provides qualitative comparisons. Root-mean-square error and volumetric differences are used as criteria for validation and comparison. Sensitivity analysis of the method’s free parameters demonstrated its robustness. Notably, the proposed algorithm exhibited superior volumetric accuracy compared to other methods when considering literature recommendations for optimal transect spacing.

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A Novel Sediment Transport Calculation Method-Based 3D CFD Model Investigation of a Critical Danube Reach

Török

Józsa

Baranya

2020

Pol. J. Environ. Stud.

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Many studies describe in detail that important bed changes were detectable in the river bed of the Upper Hungarian Danube in the last decades [1,2].The installation of the Gabcikovo hydropower plant in the upstream [3-5], other artificial interventions (e.g., groin fields, ripraps) and a significant volume of dredging [1,6] upset the balance in the sediment and morphodynamic system. The altered morphodynamic processes led to remarkable bed changes [1,[6][7][8]. During 2-3 decades, bed incision to a few meters of magnitude was detected and ascertained as the main

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Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

Abstract: Abstract

Cited by 13 publications

References 11 publications

A Shear Reynolds Number-Based Classification Method of the Nonuniform Bed Load Transport

A Shear Reynolds Number-Based Classification Method of the Nonuniform Bed Load Transport

Windowed anisotropic local inverse distance-weighted (WALID) interpolation method for riverbed mapping

A Novel Sediment Transport Calculation Method-Based 3D CFD Model Investigation of a Critical Danube Reach

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