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33 results on '"Roos, Pieter C."'

3. Modelling the influence of spatially varying hydrodynamics on the cross-sectional stability of double inlet systems, doi: 10.1007/s10236-013-0657-6

Author

Brouwer, R.L., Schuttelaars, H.M., Roos, Pieter C., Marine and Fluvial Systems, and Faculty of Engineering Technology

Subjects
Physics::Fluid Dynamics, IR-88990, Physics::Atmospheric and Oceanic Physics, METIS-298402, Physics::Geophysics
Abstract

The cross-sectional stability of double inlet systems is investigated using an exploratory model that combines Escoffier’s stability concept for the evolution of the inlet’s cross-sectional area with a two-dimensional, depth-averaged (2DH) hydrodynamic model for tidal flow. The model geometry consists of four rectangular compartments, each with a uniform depth, associated with the ocean, tidal inlets and basin. The water motion, forced by an incoming Kelvin wave at the ocean’s open boundary and satisfying the linear shallow water equations on the f -plane with linearised bottom friction, is in each compartment written as a superposition of eigenmodes, i.e. Kelvin and Poincaré waves. A collocation method is employed to satisfy boundary and matching conditions. The analysis of resulting equilibrium configurations is done using flow diagrams. Model results show that internally generated spatial variations in the water motion are essential for the existence of stable equilibria with two inlets open. In the hydrodynamic model used in the paper, both radiation damping into the ocean and basin depth effects result in these necessary spatial variations. Coriolis effects trigger an asymmetry in the stable equilibrium cross-sectional areas of the inlets. Furthermore, square basin geometries generally correspond to significantly larger equilibrium values of the inlet cross-sections. These model outcomes result from a competition between a destabilising (caused by inlet bottom friction) and a stabilising mechanism (caused by spatially varying local pressure gradients over the inlets).

Published
2013

6. Influence of basin geometry on equilibrium and stability of double inlet systems

Author

Brouwer, R.L., Schuttelaars, H.M., Roos, Pieter C., Kranenburg, W.M., Horstman, E.M., Wijnberg, K.M., Marine and Fluvial Systems, and Faculty of Engineering Technology

Subjects
Physics::Fluid Dynamics, geography, geography.geographical_feature_category, Amplitude, Stable equilibrium, Perturbation (astronomy), Geometry, Structural basin, Inlet, Physics::Geophysics
Abstract

This study investigates the influence of basin geometry on the cross-sectional stability of double inlet systems. The inlet is in equilibrium when the amplitude of the inlet velocities equals the equilibrium velocity (~1 m s-1). This equilibrium is stable when after a perturbation the cross-sections of both inlets return to their original equilibrium value. The necessary amplitudes of the inlet velocities are obtained using an idealized 2DH hydrodynamic that calculates tidal elevation and flow in a geometry consisting of several adjacent rectangular compartments. Model results suggest that regardless of the inclusion or exclusion of bottom friction in the basin, stable equilibrium states exist. Qualitatively, the influence of basin geometry does not change the presence of stable equilibrium. Quantitatively, however, taking a basin surface area of 1200 km2, equilibrium values can differ up to a factor 2 depending on the geometry of the basin.

Published
2012

9. Hydraulic resistance in arbitrarily-shaped channel cross-sections

Author

Huthoff, Freek, Roos, Pieter C., Augustijn, Dionysius C.M., Hulscher, Suzanne J.M.H., Altinakar, M.S., Kokpinar, M.A., Aydin, I., Cokgor, S., Kirkgoz, S., and Faculty of Engineering Technology

Subjects
Physics::Fluid Dynamics, METIS-246787, IR-60438
Published
2008

14. The morphodynamics of tidal sandwaves: A model overview

Author

Besio, G., Blondeaux, P., Brocchini, M., Hulscher, Suzanne J.M.H., Idier, Deborah, Knaapen, Michiel, Nemeth, Attila, Roos, Pieter C., Vittori, G., and Marine and Fluvial Systems

Subjects
METIS-248331
Published
2008

21. Potential use of sand waves and sand banks for sand mining

Author

Vittori, G., Blondeaux, P., Hulscher, Suzanne J.M.H., Piqueret, M., Roos, Pieter C., van Rijn, L.C., Soulsby, R.L., Hoekstra, P., Davies, A.G, and Faculty of Engineering Technology

Subjects
IR-52947, METIS-225002
Published
2005

22. Models of offshore sand waves and sand banks and their applications

Author

Nemeth, Attila, Blondeaux, P., Hulscher, Suzanne J.M.H., Besio, G., Roos, Pieter C., Vittori, G., Knaapen, Michiel, Brocchini, M., van der Veen, Henriëtte, Idier, Deborah, Losada, M.A., Baquerizo, A., and Faculty of Engineering Technology

Subjects
IR-50976, METIS-223810
Published
2004

28. A simple morphodynamic model for sand banks and large-scale sand pits subject to asymetrical tides

Author

Roos, Pieter C., Hulscher, Suzanne J.M.H., Peters, B.G.T.M., Nemeth, Attila, Ikeda, S., and Faculty of Engineering Technology

Subjects
METIS-125205, IR-21458
Abstract

We extend existing knowledge on theoretical growth characteristics of tidal sand banks by including asymmetrical tides with an M0, M2 and M4-constituent, thus allowing for migration. Furthermore, in the context of the continuously increasing demand on the Dutch sand market, we show that creating a large-scale offshore sand pit has long-term morphological implications, both for the pit itself and the surrounding area. The pit deepens, while around it a sand bank pattern emerges, spreading at a constant rate of the order of tens to hundred metres per year.

Published
2001

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