Flow processes forcing the development of the scour hole Beerenplaat in the Rhine-Meuse delta

The Rhine-Meuse delta is characterized by the presence of many scour holes. Koopmans (2017) showed that these scour holes have very different growth rates, even if they are located within the same river branch. Most likely this is caused by either the heterogeneous subsoil, the presence of hydraulic structures, the geometry of the river or...

The taming of the Rew: A type theory with computational assumptions

Dependently typed programming languages and proof assistants such as Agda and Coq rely on computation to automatically simplify expressions during type checking. To overcome the lack of certain programming primitives or logical principles in those systems, it is common to appeal to axioms to postulate their existence. However, one can only...

The Effect of Small Density Differences at River Confluences

Remarkable 3D flow structures occur at river confluences with small density differences due to differences in sediment concentration or temperature. We explain these by comparing numerical simulations for an idealized confluence with aerial photographs of several river confluences where color differences express the pattern of density...

Mixed Sediment Dynamics at a Tide-Dominated Confluence: A case study on the Yangon Estuary, Myanmar

This thesis research has been conducted to analyse the sediment dynamics in the Yangon Estuary, in order to define the cause for the sedimentation in Monkey Point Channel. For years, Yangon Port has been suffering from limited accessibility due to the sedimentation in the channel and currently daily dredging is required in order to let ships...

At the confluence of design by nature and structural design: An anticlastic surfaced roof supported by a fractal-like branching structure

The main objective of this graduation is to find a new structural principle that is emulated by the design by nature. Observing, analysing and transforming the natural design principles and laws could derive a new application in the field of structural design. There are many concepts, approaches and directions to translate biology to...

Dispersion in the Ayeyarwady: A description of the mixing of tracers in the area of the Ayeyarwady River- Chindwin River confluence

The Ayeyarwady River (also called Irrawaddy River) is the most important river of Myanmar and due to the country’s rapid development it is expected to become even more important. The river flows roughly from north to south through Myanmar and is very dynamic and mostly unregulated. With a length of 2170 km and an over the year average (highly...

The effect of small density differences at large confluences

Confluences are special, complex elements within river systems which have been subject of much research. However, little attention has been given to the effects of density differences in confluences. The aim of this research is to see when and how density differences are important in confluences with respect to other occurring flow structures....

Infusing digital creativity in design, the low fidelity way

In (industrial) design projects, digital and non-digital aspects are often seen as two separate design 'tracks'. Due to advances in our social and technological context, the hard boundary between the digital and the non-digital is fading. This is a challenge for the designer since he needs to be creative with digital technology without...

Dynamics of shallow lateral shear layers: Experimental study in a river with a sandy bed

Shallow lateral shear layers forming between flows with different velocities, though essential for mixing processes in natural streams, have been examined only in laboratory settings using smooth, fixed?bed channels. This paper reports the results of an experimental study of a shear layer in a straight reach of a natural river where the layer,...