Searched for: author:"Pietrzak, J.D."
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Platzek, F.W. (author), Stelling, G.S. (author), Jankowski, J.A. (author), Pietrzak, J.D. (author)
Three-dimensional hydrodynamic z-layer models, which are used for simulating the flow in rivers, estuaries, and oceans, suffer from an inaccurate and often discontinuous bottom shear stress representation, due to the staircase bottom. We analyze the governing equations and clearly show the cause of the inaccuracies. Based on the analysis, we...
journal article 2014
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Henriquez, M. (author), Meirelles Nunes da Rocha, S. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author), Pietrzak, J.D. (author), Stive, M.J.F. (author)
The South-Holland coast of the Netherlands undergoes the influence of the Rhine river plume released from the Rotterdam waterways. An experiment, STRAINS, was conducted to study the impact of the fresh water on the nearshore hydrodynamics and sand transport. As part of the experiment, an instrumented bottom frame measured the near-bed...
conference paper 2014
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Bermudez, M. (author), Pietrzak, J.D. (author), Cea, L. (author), Puertas, J. (author), Stelling, G.S. (author), De Boer, G.J. (author)
In this paper we explore the role of the river run-off, the tidal regime and the local winds in the dynamics of the Ria de Arousa estuary during the summer period, using for that purpose the numerical model Delft3D. First of all, a simulation under real hydrological and meteorological conditions is conducted in order to validate the ability of...
conference paper 2013
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Holthuijsen, L.H. (author), Powell, M.D. (author), Pietrzak, J.D. (author)
Waves breaking at the ocean surface are important to the dynamical, chemical and biological processes at the air-sea interface. The traditional view is that the white capping and aero-dynamical surface roughness increase with wind speed up to a limiting value. This view is fundamental to hurricane forecasting and climate research but it has...
journal article 2012
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Terwisscha van Scheltinga, A. (author), Myers, P.G. (author), Pietrzak, J.D. (author)
A new mesh size field is presented that is specifically designed for efficient meshing of highly irregular oceanic domains: archipelagos. The new approach is based on the standard mesh size field that uses the proximity to the nearest coastline. Here, the proximities to the two nearest coastlines are used to calculate the distance between two...
journal article 2012
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De Nijs, M.A.J. (author), Pietrzak, J.D. (author)
journal article 2012
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De Nijs, M.A.J. (author), Pietrzak, J.D. (author)
Measurements of turbulent fluctuations of velocity, salinity, and suspended particulate matter (SPM) are presented. The data show persistent countergradient buoyancy fluxes. These countergradient fluxes are controlled by the ratio of vertical turbulent kinetic energy (VKE) and available potential energy (APE) terms in the buoyancy flux equation....
journal article 2011
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De Nijs, M.A.J. (author), Pietrzak, J.D. (author), Winterwerp, J.C. (author)
An analysis of field measurements recorded over a tidal cycle in the Rotterdam Waterway is presented. These measurements are the first to elucidate the processes influencing the along-channel current structure and the excursion of the salt wedge in this estuary. The salt wedge structure remained stable throughout the measuring period. The...
journal article 2011
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De Nijs, M.A.J. (author), Winterwerp, J.C. (author), Pietrzak, J.D. (author)
Field measurements are presented, which are the first to quantify the processes influencing the entrapment of suspended particulate matter (SPM) at the limit of saltwater intrusion in the Rotterdam Waterway. The estuarine turbidity maximum (ETM) is shown to be maintained by the trapping of fluvial SPM at the head of the salt wedge. The trapping...
journal article 2010
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Kleptsova, O. (author), Stelling, G.S. (author), Pietrzak, J.D. (author)
In this paper, we focus on a conservative momentum advection discretisation in the presence of zlayers. While in the 2Dcase conservation ofmomentum is achieved automatically for an Eulerian advection scheme, special attention is required in the multi-layer case. We show here that an artificial vertical structure of the flow can be introduced...
journal article 2010
Searched for: author:"Pietrzak, J.D."
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