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De Vries, M. (author)In river engineering morphological predictions have to be made to study the implications of changes in a river system due to natural causes or human interference. It regards here time-depending processes. Characteristic parameters of the river have to be forecasted both in time and space. The morphological processes, however, are extremely...report 1985
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De Vries, M. (author)Lecture notes on river engineering and river morphology.lecture notes 1985
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Ribberink, J.S. (author), Van der Sande, J.T.M. (author)The problem of aggradation in a river due to overloading is tackled with a mathematical model consisting of a set of one-dimensional (in space) basic equations in which the water motion is assumed to be quasi-steady and the sediment transport is determined by local conditions. Analytical solutions are presented of a linearized simple-wave model,...report 1984
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De Vriend, H.J. (author), Geldof, H.J. (author)Results of a mathematical model for the depth-averaged main flow velocity in shallow river bends are compared with measurements in two consecutive sharply-curved short bends in the river Dommel, The Netherlands. The computed main velocity distribution agrees rather well with the measured one in the larger part of each bend. Near the bend exits,...report 1983
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Olesen, K.W. (author)The paper presents a linear perturbation analysis of a horizontal two-dimensional mathematical model for the flow and bed topography in straight alluvial rivers with dominant bed-load. A sediment transport model including effects of transverse bed slope, secondary (helical) flow and secondary flow inertia is employed. The stability and the...report 1983
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Loman, G.J.A. (author), De Jong, J.J.A. (author), Moir, J.R. (author), Burgers, A. (author), Verhagen, H.J. (author)Man-made islands in the Mackenzie river (Canada) for oil exploitation may obstruct the free flow of ice during spring break up. These ice dams may cause considerable rise of the water level in the rivers, resulting in floods. A numerical model is presented to simulate ice dam formation an river floods.conference paper 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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Ribberink, J.S. (author)In Chapter I a derivation of the equations and an extension of the mathematical model will be carried out. The sediment-mixture is separated in a number of fractions - each with a representative grain size - and the equations describing the sediment-movement are split up for every fraction separately. In order to get some insight in the new...report 1980
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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)The relationship between streamline curvature and bed resistance in shallow water flow with little side constraint, as derived in 1970 by H.J. Schoemaker, is reconsidered. Schoemaker concluded that the bed resistance causes the curvature of a free streamline to grow exponentially with the distance along this streamline, thus giving rise to a...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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De Vries, M. (author)Rather than reporting on a specific topic of current research in the broad field of sediment transport and river morphology, the writer will give a general contemplation on the state of the art. This will not be a review in the usual sense. The alloted space would then be filled easily with references. References will only be made here if it...report 1977
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De Vries, M. (author)Lecture notes sediment transport in rivers, formulas and numerical models.lecture notes 1976
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De Vriend, H.J. (author)Uitgaande van de Reynoldsvergelijkingen met de bijbehorende randvoorwaarden wordt een vereenvoudigd wiskundig model afgeleid voor ondiepe bochtige rivieren. met als voornaamste uitgangspunten: - de vertikale afgeleiden van de snelheden zijn groot t.o.v. de horizontale - de schuifspanningseffekten overheersen de traagheids- (advectieve) effekten....report 1976
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- Van Bendegom, L. (author) 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
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Grzywienski, A. (author)Overview of the hydraulic works in the upper part of the Danube river.book chapter 1963
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Riad, K. (author)It has long been observed that at most canal bifurcations the water diverted to the branch does not carry sediment in direct proportion to the rate of flow. Usually, the major part of sediment reaching a bifurcation is diverted into the small branches. This phenomenon has always bothered engineers responsible for the maintenance of irrigation...doctoral thesis 1961
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Mazure, J.P. (author)Ter oplossing van het, aan de "Staatscommissie inzake hooge waterstanden als gevolg van de afsluiting der Zuiderzee" voorgelegde probleem, heeft de voorzitter dezer commissie, de groote natuurkundige H. A. Lorentz, als eerste een betrouwbare en practisch uitvoerbare methode gegeven tot het berekenen. van getijverschijnselen in zeeannen. Deze...doctoral thesis 1937