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Kumar, S. (author), Ghosh, D. (author), Donselaar, M.E. (author), Burgers, F. (author), Ghosh, Ashok Kumar (author)Shallow aquifers in many Holocene alluvial basins around the world have in the last three decades been identified as arsenic pollution hotspots, in which the spatial variation of natural (or: geogenic) arsenic concentration is conditioned by the meandering-river geomorphology and the fluvial lithofacies distribution. Despite the large amount of...journal article 2021
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Frölke, Guus (author)The use of rivers for navigation and the increased human activity along their banks generally requires river control and improvement measures. Most rivers have a natural tendency for continuous change of alignment, e.g. meandering and braiding rivers. Construction of bridges, towns, berths, etc. have required fixation of the river alignment at...student report 2017
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Blanckaert, K. (author)The migration rate of sharp meander bends exhibits large variance and indicates that some sharply curved bends tend to stabilize. These observations remain unexplained. This paper examines three hydrodynamic processes in sharp bends with fixed banks and discusses their morphological implications: secondary flow saturation, outer-banks cells, and...journal article 2011
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Den Bieman, J. (author), Van den Koppel, M. (author), Van Velzen, G. (author), Verbruggen, W. (author)One of the branches of the Paraná delta is the Paraná de las Palmas River. This branch doesn’t have the biggest discharge but has the most navigation. The situation in the Paraná de las Palmas isn’t without problems though; the river banks show erosion over the whole length of the branch. This erosion has been investigated by the following...student report 2010
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Blom, A. (author)In this study the river migration model MIANDRAS has been applied to simulations of the planform changes of the river Allier, a tributary of the river Loire in France. The Allier is a very dynamic and natural river system with braided and meandering river sections. Two meandering reaches of the Allier, located between Varennes-sur-Allier and...master thesis 1997
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Siers, J. (author)In een rivierbocht treedt een zogenaamde spiraalstroming op, waardoor het typische dwarsprofiel van een rivierbocht ontstaat: diep in de buitenbocht en ondiep in de binnenbocht. Hierdoor is slechts over een kleine breedte voldoende vaardiepte aanwezig en vormen bochten in de Waal een knelpunt in de rivier voor de scheepvaart. In het Waalproject...master thesis 1997
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Wiersma, F.E. (author)Recently submerged vanes have come to the attention of Rijkswaterstaat as an option to ensure a sufficient navigable width and depth for some bends in the main Dutch rivers. The submerged vanes can counteract the spiral flow, thus reducing the typical lateral bed slope in river bends. Model calculations by Delft Hydraulics and Haskoning...master thesis 1997
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Jongbloed, J.W. (author)The flow in a river bend has a large influence on the cross-sectional profile of the bend. Due to the curvature of the bend a secondary flow, which is perpendicular to the main flow, occurs. The secondary flow is directed outwards in the upper part of the cross-section and inwards in the lower part of the cross-section. It causes by means of the...master thesis 1996
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Majoor, R. (author)De rivier de Waal is de belangrijkste scheepvaartroute van Nederland en de drukst bevaren rivier van West-Europa. Ongeveer een derde van de totale import van Duitsland komt binnen via de Waal. De huidige problemen op de Waal hebben te maken met beperkingen in de afmetingen van de vaargeul. Maatgevend zijn de beschikbare breedte en diepte bij...master thesis 1995
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De Jésus Soriano Pérez, T. (author)The prediction of planform changes is important for the site selection of structure like bridges or intakes. In the design of bank protection works it is indispensable to know future planform developments for the safety of structures and lands. The meander development process consists of translation and expansion of the bends due to bank erosion...report 1994
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Talmon, A.M. (author)Flow equations for application in river bends are derived. Coordinate transformations are achieved by tensor calculus. The momentum equations are formulated in a cylindrical coordinate system and in a cylindrical bed-following coordinate system. The depth-averaged momentum equations in a cylindrical bed-following coordinate system are derived....report 1992
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Shen, H.W. (author), Larsen, E. (author)The process of meandering has a powerful influence on man's use of rivers and river valleys. Flood control; navigation; bank protection; water supply projects; agricultural and urban development; transportation systems; and pipeline adjacent to rivers all require a sound knowledge of the meandering process, in order to he successful, with...report 1988
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Olesen, K.W. (author)A two-dimensional horizontal mathematical model of the flow and bed topography in alluvial channel bends is presented. The applicability of the model is restricted to channels of which the width-depth ratio is large, the Froude number is small, bed load is dominant and grain sorting effects are negligible. First order analyses of the...report 1985
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Nakato, T. (author), Kennedy, J.F. (author), Vadnal, J.L. (author)The principal features of the numerical model developed herein for calculation of flow and sediment-transport distributions in alluvial-river bends may be summarized as follows: i. The secondary-flow strength and the bed topography are uncoupled from the calculation of distributions of lateral shift velocity and streamwise velocity. This is...report 1983
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De Vriend, H.J. (author)Making use of a mathematical model solving the complete NavierStokes equations for steady flow in coiled rectangular pipes, fully-developed laminar flow in shallow curved channels is analysed physically and mathematically. Transverse convection of momentum by the secondary flow is shown to cause important deformations of the main velocity...doctoral thesis 1981
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Kalkwijk, J.P.T. (author), De Vriend, H.J. (author)The mathematical model presented describes the flow in rivers of which: i the depth is small compared with the width, ii the width is small compared with the radius of curvature, iii the horizontal length scale of the bottom variations is of the order of magnitude of the width. Within these limits, the channel alignment can be arbitrary and it...report 1980
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De Vriend, H.J. (author)This report describes an extensive experiment on steady turbulent flow in a rather sharply curved U-shaped flume with a shallow rectangular cross-section, under almost the same conditions as earlier, less extensive measurements in the same flume. The experiment was carried out as a part of a research project aiming at a mathematical model of the...report 1979
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De Vriend, H.J. (author)A mathematical model of steady, fully developed laminar flow in curved ducts is developed and used to derive a simplified computation method to be applied in another mathematical model predicting the flow in river bends. The laminar flow model is verified by comparing its results with analytical, numerical and experimental results reported in...report 1978
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Hooke, R.L.B. (author)A one-meter wide, meandering flume with movable sand bed was utilized in these experiments. Uniform flow was established at discharges of 20, 35, and 50 l/sec. Velocities near the bed, the distribution of sediment in transport, bed geometry, and strength of secondary flow were determined at each discharge . Bed shear stress was assumed to be...report 1974
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De Vriend, H.J. (author)The axisymmetrical, viscous flow in curved channels is considered in the case where the hydraulic radius of the cross-section is small with respect to the average radius of curvature of the bend. First Ananyan's theory on this subject is reconsidered, using a regular perturbation method. The results are applied to a specific channel with a...report 1972