Searched for: subject%3A%22mixing%255C+layer%22
(1 - 20 of 20)
document
Kusters, Niek (author)
The Atlantic Meridional Overturning Circulation (AMOC) is a key component in the Earth System. Given its important role in the climate system, variability in the AMOC strength is expected to have great impact on the global climate. The current observational timeseries are not long enough to make climate projections for the end of the century or...
master thesis 2020
document
Woud, Storm (author)
The Labrador Sea is one of the deep convection sites in the world's oceans and the water masses formed here are an important component of the Atlantic Meridional Overturning Circulation (AMOC). To study this linkage, one study in particular used an idealized model of the Labrador Sea where the density variations consists only of temperature...
master thesis 2020
document
van Rooijen, Erik (author), Mosselman, E. (author), Sloff, C.J. (author), Uijttewaal, W.S.J. (author)
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...
journal article 2020
document
Park, HyunJin (author)
As a key component to the bottom limb of the Atlantic Meridional Overturning Circulation (AMOC), the Labrador Sea is one of the regions where deep ocean convection takes place. This convection is driven by atmospheric cooling during winter, which brings the surface water into the intermediate and deep layers by uniformizing water mass properties...
master thesis 2019
document
Huppes, Nova (author)
Dams are an essential part of the Dutch flood defence works to protect the hinterland from flooding by the sea. Sand closures are the construction of closure dams with sand as the main building material. The rising and falling tide generates a current through the closure gap, which increases in strength as the gap becomes smaller. This current...
master thesis 2017
document
van Rooijen, E.J. (author)
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....
master thesis 2016
document
Three-dimensional direct numerical simulations which combine the Eulerian description of temperature, vapor content and velocity with a Lagrangian ensemble of cloud water droplets are used to study the turbulent entrainment and subsequent mixing of clear air with a cloudy air filament. The study is conducted in a shearless mixing layer setup...
conference paper 2015
document
Kruijt, M. (author)
Groynes are commonly used in the major rivers in the Netherlands. They confine the flow of the river to a main channel but also act as resistance element once submerged and in that way influence the stage discharge relationship of the river. Several formulas exist describing groynes as a drag resistance. Another possible way of determining their...
master thesis 2013
document
Voermans, J.J. (author)
Little research was done in the past concerning the propagation of three dimensional effect in shallow wake flow caused by a roughness patch. Today’s research on related subjects is dominated by emerging obstructions in shallow water where the flow can be assumed as (quasi) two dimensional. However the relevance of a submerged obstruction with...
master thesis 2013
document
Bergsma, E.W.J. (author), Bogaard, T. (author)
The general flow pattern of an open channel flow, downstream of a width restriction by two artificial dams, is analysed. A physical Froude-scaled model, under hydraulic rough conditions, with a significant large Reynolds number is used to ensure turbulent flow. Upstream of the dams the flow is uniform in transverse direction, in between and...
student report 2011
document
Talstra, H. (author)
The Ph.D. thesis “Large-scale turbulence structures in shallow separating flows” by Harmen Talstra is the result of a Ph.D. research project on large-scale shallow-flow turbulence, which has been performed in the Environmental Fluid Mechanics Laboratory at Delft University of Technology. The dynamics of quasi two-dimensional turbulence...
doctoral thesis 2011
document
Van Driel, R. (author), Jonker, H.J.J. (author)
In this study the response of dry convective boundary layers to nonstationary surface heat fluxes is systematically investigated. This is relevant not only during sunset and sunrise but also, for example, when clouds modulate incoming solar radiation. Because the time scale of the associated change in surface heat fluxes may differ from case to...
journal article 2011
document
Van Prooijen, B.C. (author), Uijttewaal, W.S.J. (author)
This study demonstrates the importance of a sophisticated sub-grid model when performing a depth-averaged unsteady RANS simulation of a shallow flow. The reduction of resolution and the spatial dimensions exclude important physical processes as present in three-dimensional turbulence. Especially the effect of the bottom turbulence on the...
journal article 2008
document
Castillo Rodriguez, J.T. (author)
The use of pile groynes to reduce sediment exchange between river and harbour Introduction To reduce siltation in harbours located in rivers or waterways in order to decrease the high costs of dredging and maintenance of its basins, a need of searching measures to decrease the sediment exchange between river and harbour arises. Research One of...
master thesis 2008
document
Vermaas, D.A. (author)
Hydraulic roughness is a key factor in modeling open channel flow. The frictional effects of roughness elements are generally parameterized by a roughness coefficient, representative for the roughness of a grid cell in a model. Bed roughness can be very heterogeneous in practical situations. Especially in floodplains, the roughness height can...
master thesis 2008
document
Van Noort, E.T.L. (author)
In onderhavige studie is de meettechniek "Particle Tracking Velocimetry" (PTV) toegepast ten behoeve van het onderzoek naar ondiepe waterstromingen. Het doel van het onderzoek was de meettechniek beschikbaar te krijgen voor studies aan ondiep-waterstromingen en de geschiktheid van de methode voor het meten van grootschalige structuren aan te...
master thesis 1998
document
Boersma, B.J. (author), Kooper, M.N. (author), Nieuwstadt, F.T.M. (author), Wesseling, P. (author), Geurts, B.J. (author), Kuerten, J.G.M. (author), Zandbergen, P.J. (author)
journal article 1997
document
Van der Wegen, M. (author)
A shallow water mixing layer is a flow pattern which develops between two adjacent streams with a different velocity. The horizontal dimensions of a shallow water mixing layer are much larger than the depth. This results in a turbulent process in the mixing layer which is characterized by the presumable presence of two distinct turbulent length...
master thesis 1996
document
Tukker, J. (author)
This investigation on shallow mixing layers has two main objectives: - To gain insight in the influence of the depth on the evolution of large, horizontal eddies in a lateral mixing layer in a shallow free-surface flow. - To gain insight in the contribution of these eddies to the entrainment into the layer and to the mixing and to the transport...
report 1994
document
Wang, L.X. (author)
Some measurements were conducted in a suddenly expanding flume with a rough bottom. In the approach flume, the friction velocity was determined in three ways and the distributions of turbulence intensities and Reynolds stress in a vertical were obtained. The measurement of the separating turbulent flow comprised the distribution of depth...
report 1983
Searched for: subject%3A%22mixing%255C+layer%22
(1 - 20 of 20)