Validate results of river bends modelled by Delft3D 4 Suite and D-Flow FM

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...

Erosion of river banks along the Paraná de las Palmas River, Argentina

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...

Planform changes and overbank flow in meandering rivers: The river Allier

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...

Het morfologische effect van bochtverbeteringen in een rivier

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...

The modelling of submerged vanes: A means of fairway improvement in river bends

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...

Three-dimensional modelling of secondary flow in river bends

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...

Bodemschermen: Een nieuw ontwerp voor rivierbochtverbetering

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...