The influence of patch distribution patterns on resistance in partially vegetated channels

Abstract: For a design purpose, this study mainly focuses on the channel resistance with different spatial distribution of the vegetation patches. Even under the same blockage factor, the total patch numbers in the channel, the distance between two vegetation patches both in the lateral and longitudinal direction as well as the length ratio of...

Evaluation of concrete armour units used to repair damaged dolos breakwaters

Richards Bay Port, located in the East Coast of South Africa, was built during the 1970s. Two rubble mound breakwaters were constructed to protect the deep-water entrance channel and create a sheltered area for the vessels. Since the completion of these breakwaters in 1976, they have withstood several major storms, including cyclones that have...

The effect of navigation on the flow in a river trained with groynes

The study deals with the investigation of flow structures in groyne fields interacting with the flow generated by navigation. Groynes are traditionally constructed to ensure adequate water depth for navigation, so the interaction of navigation and groyne fields is nearly guaranteed. The Hungarian Danube section – which is part of the 7th...

Spatial distribution of wave overtopping

The goal of this master thesis is to describe the spatial distribution of the wave overtopping discharge over and behind the crest of a coastal defence structure. The influence of the most relevant parameters on this process is explored. This research has been performed by means of a physical model. The following relevant parameters were varied...

Flow velocity at rubble mound breakwaters

Measurements of flow velocities due to wave action on top of shallow toe structures in front of a rubble mound breakwater. Laboratory tests in the Fluid Mechanics lab, TU Delft.

Stability of wide-graded rubble mounds

The reshaping of temporary rubble mounds like the core of breakwaters or reclamation bunds is often a concern for contractorsi n the construction stages of marine structures. The formulas found in literature for the prediction of such behavior are few, and they do not provide clear insight on the influence of relevant parameters, in particular...

Experimenteel onderzoek naar waterbeweging in een rivier met kribvak en uiterwaard

Bij overstroomde kribben in een rivier met uiterwaard zijn grootschalige horizontale wervels te verwachten. Het tijdsgemiddelde langssnelheidsprofiel in dwarsrichting is bepalend voor het ontstaan van grootschalige wervels. In het kribvak vindt een grote richtingsvariatie in ruimte en tijd plaats. Deze variatie zorgt voor een grote uitwisseling...

The current deflecting wall in a tidal harbour with density influences

Siltation is a serious problem for harbours situated on tidal rivers and estuaries. Maintenance dredging is necessary on a regular basis to guarantee safe navigation and is often a large cost factor. A means to prevent sediment from entering a harbour is the Current Deflecting Wall (CDW), which passively alters the water exchange at the harbour...