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Статті в журналах з теми "Bedload predictor"

Автор: Grafiati

Опубліковано: 11 березня 2023

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1

Gilja, Gordon, and Neven Kuspilić. "Dune geometry estimation using apparent bedload velocity as predictor variable." E3S Web of Conferences 40 (2018): 02054. http://dx.doi.org/10.1051/e3sconf/20184002054.

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Dune formation in river systems influences sediment transport, flow characteristics, bank erosion, flood control, navigation and the protection of land and infrastructure. Research on dunes is mainly flume-based, and conclusions from such research are rarely, if at all, verified with field measurements. Dune formation and geometry in terms of height, length and steepness is most commonly correlated with averaged flow parameters as flow depth. Application of relations defined in flume conditions is limited due to stationary flow conditions and extrapolation issues for natural watercourses. It i

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2

Badoux, A., J. M. Turowski, L. Mao, N. Mathys, and D. Rickenmann. "Rainfall intensity–duration thresholds for bedload transport initiation in small Alpine watersheds." Natural Hazards and Earth System Sciences 12, no. 10 (2012): 3091–108. http://dx.doi.org/10.5194/nhess-12-3091-2012.

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Abstract. Although channel discharge represents one of the primary controls of bedload transport rates in mountain streams, it is rarely measured in small, steep catchments. Thus, it is often impossible to use it as a predictor of hazardous bedload events. In this study, the characteristics of rainfall events leading to bedload transport were investigated in five small Alpine catchments located in different geographical and morphological regions of Switzerland, Italy and France. Using rainfall data at high temporal resolution, a total of 370 rainfall events were identified that led to abundant

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3

Kleinhans, M. G., A. W. E. Wilbers, and W. B. M. ten Brinke. "Opposite hysteresis of sand and gravel transport upstream and downstream of a bifurcation during a flood in the River Rhine, the Netherlands." Netherlands Journal of Geosciences 86, no. 3 (2007): 273–85. http://dx.doi.org/10.1017/s0016774600077854.

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AbstractAt river bifurcations water and sediment is divided among the downstream branches. Prediction of the sediment transport rate and division thereof at bifurcations is of utmost importance for understanding the evolution of the bifurcates for short-term management purposes and for long-term fluvial plain development. However, measured sediment transports in rivers rarely show a uniquely determined relation with hydrodynamic parameters. Commonly a hysteresis is observed of transport rate as a function of discharge or shear stress which cannot be explained with the standard sediment transpo

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4

Zhang, Bin, Xing Nian Liu, and Feng Guang Yang. "Two Stochastic Fraction Bedload Transport Rate Models for Nonuniform Sediment." Applied Mechanics and Materials 295-298 (February 2013): 1894–97. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.1894.

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Based on a method stochastic processes, two new bedload transport models for the ith size fraction nonuniform sediment are theoretically developed by using a stochastic model of sediment exchange and the probabilistic distribution of fractional bedload transport rates. The relations, proposed recently by Yang, for the probability of fractional incipient motion and for the average velocity of particle motion are introduced to bedload formulas. Plenty of experimental data for the bedload transport rate of uniform sediment are used to determine parameters. Finally, the two models are verified wit

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5

Roushangar, Kiyoumars, and Roghayeh Ghasempour. "Prediction of non-cohesive sediment transport in circular channels in deposition and limit of deposition states using SVM." Water Supply 17, no. 2 (2016): 537–51. http://dx.doi.org/10.2166/ws.2016.153.

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Sedimentation in sewer pipes has a negative impact on the performance of sewerage systems. However, due to the complex nature of sedimentation, determining the governing equations is difficult and the results of the available classic models for computing bedload transport rate often differ from each other. This paper focuses on the capability of a support vector machine (SVM) as a meta-model approach for predicting bedload transport in pipes. The method was applied for the deposition and limit of deposition states of sediment transport. Two different scenarios were proposed: in Scenario 1, the

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6

Bayram, Atilla, Sean O'Neil, and Yang Zhang. "SEDIMENT TRANSPORT FIELD DATA AND NUMERICAL MODELING STUDY TO SUPPORT DREDGE PIT INFILL RATE ESTIMATES." Coastal Engineering Proceedings, no. 36v (December 31, 2020): 57. http://dx.doi.org/10.9753/icce.v36v.papers.57.

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Site specific bedload and suspended sediment transport data collected at two test pit locations over a four-day period during April 2015 were analyzed to calibrate a numerical sediment transport model of Cook Inlet, AK. The field data campaign was designed to collect suspended load and bedload field measurements and was carried out in two phases. During Phase 1, both suspended load and bedload measurements were taken at approximately 55 ft water depth. The suspended sediment concentration was observed to be nearly uniform over the water column. Laboratory analysis showed the suspended sediment

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7

Bonilla-Porras, José A., Aronne Armanini, and Alessandra Crosato. "Extended Einstein's parameters to include vegetation in existing bedload predictors." Advances in Water Resources 152 (June 2021): 103928. http://dx.doi.org/10.1016/j.advwatres.2021.103928.

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8

Giberson, Donna J., and Daniel Caissie. "Stream habitat hydraulics: interannual variability in three reaches of Catamaran Brook, New Brunswick." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 2 (1998): 485–94. http://dx.doi.org/10.1139/f97-247.

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The hydraulic habitat of 12 sites in a small salmon stream in central New Brunswick was investigated between 1992 and 1995 to determine patterns of habitat (substrate) stability between and within reaches. Stability was evaluated by measuring particle size distribution in replicated erosional and depositional sites in each reach and calculating the proportion of the bed predicted to be in motion at given flood flows. Erosional (riffle) sites in all reaches showed significant differences (ANOVA, p < 0.05) in substrate particle sizes from year to year, movement of embedded sediment samplers,

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9

Hosseini, Seyed Abbas, Abbas Abbaszadeh Shahri, and Reza Asheghi. "Prediction of bedload transport rate using a block combined network structure." Hydrological Sciences Journal 67, no. 1 (2022): 117–28. http://dx.doi.org/10.1080/02626667.2021.2003367.

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10

Khosravi, Khabat, James R. Cooper, Prasad Daggupati, Binh Thai Pham, and Dieu Tien Bui. "Bedload transport rate prediction: Application of novel hybrid data mining techniques." Journal of Hydrology 585 (June 2020): 124774. http://dx.doi.org/10.1016/j.jhydrol.2020.124774.

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11

Pruszak, Zbigniew, and Ryszard B. Zeidler. "ESTIMATES OP GROSS-SHORE BEDLOAD AND BED CHANGES." Coastal Engineering Proceedings 1, no. 21 (1988): 131. http://dx.doi.org/10.9753/icce.v21.131.

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Four series of tracer studies employing radioisotopic sand, tracked remotely from land, were carried out at the IBW PAN's coastal research station at Lubiatowo. Incipient motion of single grains with velocity Vcr1 has agreed with Komar and Miller's (1974) formula, and has been 5...8 times smaller than voro, the threshold velocity of water inducing bulk motion_of sediment. The ratio of average nearbed water velocity, v, to_the effective speed of tracer sand, in the inshore zone, va, is estimated about 100...1,000. The cross-shore sediment transport rates measured are ten times smaller than thos

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12

Wyssmann, Micah A., and A. N. (Thanos) Papanicolaou. "Lagrangian modeling of bedload movement via the impulse entrainment method." E3S Web of Conferences 40 (2018): 05041. http://dx.doi.org/10.1051/e3sconf/20184005041.

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At low shear stresses merely above incipient conditions, the characteristic travel patterns of bedload particles remain difficult to predict due to intermittent movement. At these conditions, particles rest, are entrained into the flow when sufficient momentum transfer from near-bed turbulence occurs, and then come to rest again. The overarching goal of this research is to close the critical gaps related to intermittent movement in order to allow for Lagrangian modeling of bedload at near incipient conditions. Thereby, the specific objectives of the present work are to predict the statistics o

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13

Seminara, Giovanni, Marco Colombini, and Gary Parker. "Nearly pure sorting waves and formation of bedload sheets." Journal of Fluid Mechanics 312 (April 10, 1996): 253–78. http://dx.doi.org/10.1017/s0022112096001991.

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Bedload sheets are coherent migrating patterns of bed material recently observed both in flume studies and in field streams with beds of coarse sand and fine gravel. This newly recognized feature is inherently associated with the heterogeneous character of the sediment and consists of sorting waves with distinct coarse fronts only one or two coarse grains high.The question of the formation of bedload sheets poses an interesting and peculiar stability problem for the grain size distribution. Sorting waves are essentially two-dimensional migrating perturbations associated with variations of this

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14

Kovacs, Agnes, and Gary Parker. "A new vectorial bedload formulation and its application to the time evolution of straight river channels." Journal of Fluid Mechanics 267 (May 25, 1994): 153–83. http://dx.doi.org/10.1017/s002211209400114x.

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The derivation of a new vectorial bedload formulation for the transport of coarse sediment by fluid flow is presented in the first part of the paper. This relation has been developed for slopes up to the angle of repose both in the streamwise and transverse directions. The pressure distribution is assumed to be hydrostatic. The bed shear stress for the onset of particle motion and mean particle velocity are obtained from the mean force balance on a particle. A new generalized Bagnold hypothesis is introduced to calculate the sediment content of the bedload layer. The new formulation possesses

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15

Pournazeri, S., S. S. Li, and F. Haghighat. "Efficient non-hydrostatic modelling of flow and bed shear stress in a pier scour hole." Canadian Journal of Civil Engineering 41, no. 5 (2014): 450–60. http://dx.doi.org/10.1139/cjce-2013-0160.

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Predicting 3-D flow in a pier scour hole and the associated bed shear stress τb is important for the safe and economical design of bridge piers. This paper combines layered, hydrostatic hydrodynamic computations with non-hydrostatic pressure corrections, exploring a new modelling approach for efficient and reliable predictions of 3-D flow velocity. The law of the wall method is used for estimating τb. Its suitability for incorporation into layered models for bedload transport and pier scour simulations is also discussed. The predicted flow shows realistic features: strong downward flow adjacen

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16

Zang, Zhipeng, Yiping Zhang, Tongqing Chen, Botao Xie, Xing Zou, and Zhichuan Li. "A Numerical Simulation of Internal Wave Propagation on a Continental Slope and Its Influence on Sediment Transport." Journal of Marine Science and Engineering 11, no. 3 (2023): 517. http://dx.doi.org/10.3390/jmse11030517.

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Significant current velocity near the sea bottom can be induced by internal waves, even for water a few hundred meters in depth. In this study, a nonhydrostatic ocean model was applied to simulate the generation and propagation of internal waves on the continental slope of the northern SCS. Based on the analyses of the vertical profiles of the currents, the propagation of internal waves along the continental slope can be categorized into six modes. The bed shear stress and the bedload transport were calculated to analyze the general characteristics of sediment transport along the continental s

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17

Mohammed Pirot, Omed, and Sobri Harun. "THE INFLUENCE OF THE CHANNEL BED RECTANGULAR CONFIGURATION ON SEDIMENT TRANSPORTATION." Jurnal Teknologi 85, no. 2 (2023): 41–51. http://dx.doi.org/10.11113/jurnalteknologi.v85.18815.

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Sediment transport is the movement of organic and inorganic particles caused by gravity, a moving fluid’s force, the wind, and ice motion. Sediment deposition degrades dams’ safety, leading to environmental pollution and channel area reduction. This study describes the effect of the weir height and spacing of used and non-used rectangular configuration structures on sediment transport rates in an open channel. This project was created using a rectangular open channel (30 cm wide and 60 cm deep). A sharp-crested weir was installed in the channel, and the rectangular wooden configurations were f

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18

Khorram, Saeed. "Bedload Sediment Rate Prediction for the Sand Transport Along Coastal Waters in Ocean Management Strategy." China Ocean Engineering 34, no. 6 (2020): 840–52. http://dx.doi.org/10.1007/s13344-020-0076-7.

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19

Khorram, Saeed. "Bedload Sediment Rate Prediction for the Sand Transport Along Coastal Waters in Ocean Management Strategy." China Ocean Engineering 34, no. 6 (2020): 840–52. http://dx.doi.org/10.1007/s13344-020-0076-7.

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20

Hunt, Heather L., David C. Fugate, and Robert J. Chant. "Modeling Bedload Transport of Juvenile Bivalves: Predicted Changes in Distribution and Scale of Postlarval Dispersal." Estuaries and Coasts 32, no. 6 (2009): 1090–102. http://dx.doi.org/10.1007/s12237-009-9205-5.

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21

Latosinski, Francisco Guillermo, Ricardo Nicolás Szupiany, Massimo Guerrero, Mario Luis Amsler, and Carlos Vionnet. "The ADCP's bottom track capability for bedload prediction: Evidence on method reliability from sandy river applications." Flow Measurement and Instrumentation 54 (April 2017): 124–35. http://dx.doi.org/10.1016/j.flowmeasinst.2017.01.005.

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22

Métivier, François, Olivier Devauchelle, Hugo Chauvet, et al. "Geometry of meandering and braided gravel-bed threads from the Bayanbulak Grassland, Tianshan, P. R. China." Earth Surface Dynamics 4, no. 1 (2016): 273–83. http://dx.doi.org/10.5194/esurf-4-273-2016.

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Abstract. The Bayanbulak Grassland, Tianshan, P. R. China, is located in an intramontane sedimentary basin where meandering and braided gravel-bed rivers coexist under the same climatic and geological settings. We report and compare measurements of the discharge, width, depth, slope and grain size of individual threads from these braided and meandering rivers. Both types of threads share statistically indistinguishable regime relations. Their depths and slopes compare well with the threshold theory, but they are wider than predicted by this theory. These findings are reminiscent of previous ob

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23

Métivier, F., O. Devauchelle, H. Chauvet, et al. "Morphology of meandering and braided gravel-bed streams from the Bayanbulak Grassland, Tianshan, China." Earth Surface Dynamics Discussions 3, no. 4 (2015): 1289–316. http://dx.doi.org/10.5194/esurfd-3-1289-2015.

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Abstract. The Bayanbulak Grassland, Tianshan, China is located in an intramountane sedimentary basin where meandering and braided gravel-bed streams coexist under the same climatic and geological settings. We report on measurements of their discharge, width, depth, slope and grain size. Based on this data set, we compare the morphology of individual threads from braided and meandering streams. Both types of threads share statistically indistinguishable regime relations. Their depths and slopes compare well with the threshold theory, but they are wider than predicted by this theory. These findi

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24

Lotsari, Eliisa S., Mikel Calle, Gerardo Benito, et al. "Topographical change caused by moderate and small floods in a gravel bed ephemeral river – a depth-averaged morphodynamic simulation approach." Earth Surface Dynamics 6, no. 1 (2018): 163–85. http://dx.doi.org/10.5194/esurf-6-163-2018.

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Abstract. In ephemeral rivers, channel morphology represents a snapshot at the end of a succession of geomorphic changes caused by floods. In most cases, the channel shape and bedform migration during different phases of a flood hydrograph cannot be identified from field evidence. This paper analyses the timing of riverbed erosion and deposition of a gravel bed ephemeral river channel (Rambla de la Viuda, Spain) during consecutive and moderate- (March 2013) and low-magnitude (May 2013) discharge events, by applying a morphodynamic model (Delft3D) calibrated with pre- and post-event surveys by

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25

Hinton, Darren, Rollin H. Hotchkiss, and Michael Cope. "Comparison of Calibrated Empirical and Semi-Empirical Methods for Bedload Transport Rate Prediction in Gravel Bed Streams." Journal of Hydraulic Engineering 144, no. 7 (2018): 04018038. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0001474.

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26

Gonzalez-Rodriguez, David, and Ole Secher Madsen. "PREDICTION OF NET BEDLOAD TRANSPORT RATES OBTAINED IN OSCILLATING WATER TUNNELS AND APPLICABILITY TO REAL SURF ZONE WAVES." Coastal Engineering Proceedings 1, no. 32 (2011): 21. http://dx.doi.org/10.9753/icce.v32.sediment.21.

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Experimental studies of sediment transport rates due to nearshore waves are often conducted in oscillating water tunnels (OWTs). In an OWT, the oscillatory motion produced by the piston propagates almost instantaneously along the entire tunnel. Consequently, unlike the wave motion in the sea or in a wave flume, flow in an OWT is uniform along the tunnel, and second-order wave propagation effects (such as Longuet-Higgins's streaming) are absent. The effect of these hydrodynamic differences between OWT and sea waves on sediment transport rates has generally been neglected. In this paper we prese

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27

COLOMBINI, M., and A. STOCCHINO. "Ripple and dune formation in rivers." Journal of Fluid Mechanics 673 (March 2, 2011): 121–31. http://dx.doi.org/10.1017/s0022112011000048.

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A linear stability analysis for dune and ripple formation is presented that implements a rotational two-dimensional flow model valid in the smooth as well as in the transitional and rough flow regimes. Sediment is assumed to be transported as bedload, disregarding the role of suspension. Therefore, the main mechanism driving instability, for both ripples and dunes, is the phase lag between bed shear stress and bed elevation. Ripples are shown to be confined to relatively low values of the Shields parameter and of the particle Reynolds number. For higher values of the Shields parameter and of t

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28

Carrillo, Veronica, Daniel Mendoza, John Petrie, et al. "Using a statistical efficiency methodology for predictors’ selection in the bedload transport problem: A high gradient experimental channel case." Alexandria Engineering Journal 61, no. 8 (2022): 6205–19. http://dx.doi.org/10.1016/j.aej.2021.11.052.

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29

Terwisscha van Scheltinga, Renske C., Heide Friedrich, and Giovanni Coco. "A PIV-based method to measure spatial gradients in bedload transport over a dune." E3S Web of Conferences 40 (2018): 04012. http://dx.doi.org/10.1051/e3sconf/20184004012.

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Traditional sediment transport equations calculate sediment flux from bed shear stress and the equations predict that transport increases nonlinearly with an increase in flow velocity. In a dune field, the dune geometry affects the flow velocity causing accelerating flow over the dune crest and de- and reattachment of the flow downstream of the dune crest. Sediment flux predicted from the reach-averaged bed shear stress gives fairly good results for dune fields, though their simplification is discordant for the complexity of the processes involved. Measurements of the displacement of sand part

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30

Daham, Mariam H. "A Prediction Formula for The Estimation of Sediment Load in The Upper Reach of Al-Gharraf River." Journal of Engineering 27, no. 5 (2021): 63–74. http://dx.doi.org/10.31026/j.eng.2021.05.05.

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The presence of deposition in the river decreases the river flow capability's efficiency due to the absence of maintenance along the river. In This research, a new formula to evaluate the sediment capacity in the upstream part of Al-Gharraf River will be developed. The current study reach lies in Wasit province with a distance equal to 58 km. The selected reach of the river was divided into thirteen stations. At each station, the suspended load and the bedload were collected from the river during a sampling period extended from February 2019 till July 2019. The samples were examined in the lab

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31

MIURA, Sawa, Takahiro KOSHIBA, and Tetsuya SUMI. "SEDIMENT VOLUME PREDICTION IN THE DIVERSION POOL OF THE KOSHIBU DAM SEDIMENT BYPASS TUNNEL USING BEDLOAD MONITORING IN UPSTREAM REACHES." Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 77, no. 2 (2021): I_577—I_582. http://dx.doi.org/10.2208/jscejhe.77.2_i_577.

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32

Kranenborg, Joost W. M., Geert H. P. Campmans, Niels G. Jacobsen, Jebbe J. van der Werf, Ad J. H. M. Reniers, and Suzanne J. M. H. Hulscher. "Depth-Resolved Modelling of Intra-Swash Morphodynamics Induced by Solitary Waves." Journal of Marine Science and Engineering 10, no. 9 (2022): 1175. http://dx.doi.org/10.3390/jmse10091175.

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We present a fully coupled 2DV morphodynamic model, implemented in OpenFOAM® that is capable of simulating swash-zone morphodynamics of sandy beaches. The hydrodynamics are described by the Reynolds-averaged Navier–Stokes (RANS) equations with a k−ω turbulence model and the Volume of Fluid (VoF) approach for discriminating between air and water. Sediment transport is described in terms of bedload and suspended load transport. We show that the default divergence scheme in OpenFOAM can become numerically unstable and lead to negative sediment concentrations, and propose a solution to avoid this

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33

Anderson, Noah T., Clinton A. Cowan, and Kristin D. Bergmann. "A case for the growth of ancient ooids within the sediment pile." Journal of Sedimentary Research 90, no. 8 (2020): 843–54. http://dx.doi.org/10.2110/jsr.2020.45.

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ABSTRACT In modern ooid-forming environments in the Caribbean, aerobic respiration of organic matter below the sediment–water interface drives an increase in pCO2 and a corresponding decrease in carbonate saturation state (Ω) that creates shallow sediment porewater that is neutral or slightly caustic to carbonate. The locus of ooid growth, therefore, is presumed to be in the water column during suspension, where supersaturation with respect to calcium carbonate is the norm. In the past, however, during conditions of low aqueous O2, high Ω, or low organic-matter input, the shallow sub-sediment

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34

de Leeuw, Jan, Michael P. Lamb, Gary Parker, et al. "Entrainment and suspension of sand and gravel." Earth Surface Dynamics 8, no. 2 (2020): 485–504. http://dx.doi.org/10.5194/esurf-8-485-2020.

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Abstract. The entrainment and suspension of sand and gravel are important for the evolution of rivers, deltas, coastal areas, and submarine fans. The prediction of a vertical profile of suspended sediment concentration typically consists of assessing (1) the concentration near the bed using an entrainment relation and (2) the upward vertical distribution of sediment in the water column. Considerable uncertainty exists in regard to both of these steps, especially the near-bed concentration. Most entrainment relations have been tested against limited grain-size-specific data, and no relations ha

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35

Florek, Jacek, and Maciej Wyrębek. "Procedure of Numerical Modelling and Estimation of Sieve Curve Changes as a Tool to Define Riverbed’s Erodibility." Sustainability 15, no. 2 (2023): 1468. http://dx.doi.org/10.3390/su15021468.

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The numerical 1-D HEC-RAS modelling tool was supported by the estimation of the sieve curve changes procedure to measure the scale of predicted discharges along a stretch of stream in southern Poland on the Olkusz Upland. The procedure was calibrated in southern Poland on the mountain streams during high-stage events, using a radiotracer application in bedload transport. Particular terrain hypsometry, created by the dissolution of limestone, forced the deep erosion of the river valley bottom; it is here that the current shape of the riverbed of the Prądnik stream is placed. While numerical mod

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36

Ong, Muk Chen, Torbjørn Utnes, Lars Erik, Dag Myrhaug та Bjørnar Pettersen. "Near-Bed Flow Mechanisms Around a Circular Marine Pipeline Close to a Flat Seabed in the Subcritical Flow Regime Using a k-ɛ Model". Journal of Offshore Mechanics and Arctic Engineering 134, № 2 (2011). http://dx.doi.org/10.1115/1.4004631.

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Flow mechanisms around a two-dimensional (2D) circular marine pipeline close to a flat seabed have been investigated using the 2D unsteady Reynolds-averaged Navier–Stokes (URANS) equations with a standard high Reynolds number k-ɛ model. The Reynolds number (based on the free stream velocity and cylinder diameter) ranges from 1 × 104 to 4.8 × 104 in the subcritical flow regime. The objective of the present study is to show a thorough documentation of the applicability of the k-ɛ model for engineering design within this flow regime by means of a careful comparison with available experimental dat

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