Contribution to the Theory of Internal Waves

The behaviour of internal waves in vertically inhomogeneous fluids has been studied theoretically by various authors, from the point of view of general hydrodynamics as well as of meteorology and of physical oceanography (see the list of references, which, however, is not meant to be complete). For mathematical reasons most of them assumed...

On the magnitude of interfacial shear of subcritical stratified flows: Report on analysis of literature data

On Internal Waves in a Density-Stratified Estuary

In this article some field observations, made in recent years, of internal wave motions in a density-stratified estuary are presented, In order to facilitate the appreciation of the results, and to make some quantitative comparisons, the relevant theory is also summarized. Furthermore, the origins of stratification in estuaries is briefly...

Analysis of unsteady and stratified tidal flume experiments with emphasis on turbulence, mixing and on internal gravity waves

The importance of internal waves for mixing in a stratified estuarine tidal flow

Sediment transport and fluid mud flow: Physical mud properties and parameterization of vertical transport processes SILTMAN ; set-up of a POINT-MUD MODEL

Non-Hydrostatic Modelling of Waves in Layered Fluids

In this thesis a non-hydrostatic two-layer 2DV model, based on the scheme presented by Stelling and Zijlema (2003), is developed. The model is non-hydrostatic; the velocities are corrected with a pressure gradient following from the requirement of a divergence free flow field per computational cell. The model is a two-layer model; only layered...

Internal wave generation in a non-hydrostatic wave model

In this work, internal wave generation techniques are developed in an open source non-hydrostatic wave model (SimulatingWAves till SHore, SWASH) for accurate generation of regular and irregular long-crested waves. Two different internal wave generation techniques are examined: a source term addition method where additional surface elevation is...

Internal gravity waves in the Rhine ROFI: Applicability of the KdV model

The Rhine Region of Fresh Water Influence (ROFI) is a shallow frictional river plume in front of the Dutch coast. Each tidal cycle a new tidal plume front with fresh-water is released. Recently, internal gravity waves have been observed in this plume. Using a Froude number analysis, support for the internal wave generation mechanism by a tidal...

On the accuracy of internal wave generation method in a non-hydrostatic wave model to generate and absorb dispersive and directional waves

The weakly reflective wave generation is a wave generation and absorption method in phase-resolving models, based on the assumption that the waves propagating towards the wave generation boundary are small amplitude shallow water waves with direction perpendicular to the boundary. This assumption makes the method weakly reflective for...

Undular bottom topography as a salt intrusion mitigation measure: A study on the potential of trapped internal waves to enhance vertical mixing

Due to climate change and human interventions, saltwater intrusion is becoming a topic of increasing concern worldwide. Salt water intrudes into the Rotterdam Waterway (RWW) by an exchange flow, where the denser sea water propagates landwards at the bottom. The main competing mechanism for this stratified exchange flow is...

Mixing of salinity by ship traffic in canals

Salt intrusion poses a threat to the fresh water supply function of inland waterways. How far inland salt intrusion reaches is dependent on a balance of buoyancy forcing, water depth, discharge of the canal and the amount of mixing. Wind, bottom roughness, and sailing ships contribute to mixing. Currently, little is known about the contribution...

Weakly nonlinear waves in stratified shear flows

We develop a Korteweg-De Vries (KdV) theory for weakly nonlinear waves in discontinuously stratified two-layer fluids with a generally prescribed rotational steady current. With the help of a classical asymptotic power series approach, these models are directly derived from the divergence-free incompressible Euler equations for unidirectional...

Dynamic Response of a Submerged Floating Tunnel Subject to Hydraulic Loading: Numerical Modelling for Engineering Design

The submerged floating tunnel (SFT), also called an Archimedes Bridge, is a new type of infrastructure for wide and deep sea-crossings, regarded as one of the alternatives to bored and immersed tunnels and bridges. It is afloat in water employing its buoyancy and a support system to balance its self-weight. However, no prototype SFT has yet been...