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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
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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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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), 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) 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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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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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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Rijnsburger, S. (author), Van der Hout, C.M. (author), Van Tongeren, O. (author), De Boer, G.J. (author), Van Prooijen, B.C. (author), Borst, W.G. (author), Pietrzak, J.D. (author)This study identifies and unravels the processes that lead to stratification and destratification in the far field of a Region of Freshwater Influence (ROFI). We present measurements that are novel for two reasons: (1) measurements were carried out with two vessels that sailed simultaneously over two cross-shore transects; (2) the measurements...journal article 2016
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Flores, Raúl P. (author), Rijnsburger, S. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author), Pietrzak, J.D. (author)We present measurements of along and across-shore sediment transport in a region of the Dutch coast 10 km north of the Rhine River mouth. This section of the coast is characterized by strong vertical density stratification because it is within the midfield region of the Rhine region of freshwater influence, where processes typical of the far...journal article 2017
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Horner-Devine, Alexander R. (author), Pietrzak, J.D. (author), Souza, Alejandro J. (author), McKeon, Margaret A. (author), Meirelles, Saulo (author), Henriquez, M. (author), Flores, Raúl P. (author), Rijnsburger, S. (author)We present a new mechanism for cross-shore transport of fine sediment from the nearshore to the inner shelf resulting from the onshore propagation of river plume fronts. Onshore frontal propagation is observed in moorings and radar images, which show that fronts penetrate onshore through the nearshore and surf zone, almost to the waterline....journal article 2017
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Rijnsburger, S. (author), Flores, Raúl P. (author), Pietrzak, J.D. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author)In this study we used field data and radar images to investigate the influence of winds and tides on the propagation of tidal plume fronts. The measurements were collected in a shallow shelf region off the Dutch coast, 10 km north of the Rhine River mouth, and they clearly show the passage of distinct freshwater lenses and associated fronts...journal article 2018
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Meirelles, Saulo (author), Henriquez, M. (author), Reniers, A.J.H.M. (author), Luijendijk, Arjen (author), Pietrzak, J.D. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author), Stive, M.J.F. (author)The Sand Engine is a 21.5 million m<sup>3</sup> experimental mega-nourishment project that was built in 2011 along the Dutch coast. This intervention created a discontinuity in the previous straight sandy coastline, altering the local hydrodynamics in a region that is influenced by the buoyant plume generated by the Rhine River. This work...journal article 2018
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Candy, A.S. (author), Pietrzak, J.D. (author)The approaches taken to describe and develop spatial discretisations of the domains required for geophysical simulation models are commonly ad hoc, model- or application-specific, and under-documented. This is particularly acute for simulation models that are flexible in their use of multi-scale, anisotropic, fully unstructured meshes where a...journal article 2018
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van Westen, René M. (author), Dijkstra, Henk A. (author), Klees, R. (author), Riva, R.E.M. (author), Slobbe, D.C. (author), van der Boog, C.G. (author), Katsman, C.A. (author), Candy, A.S. (author), Pietrzak, J.D. (author), Zijlema, Marcel (author), James, Rebecca K. (author), Bouma, Tjeerd J. (author)The Yucatan Channel connects the Caribbean Sea with the Gulf of Mexico and is the main outflow region of the Caribbean Sea. Moorings in the Yucatan Channel show high-frequent variability in kinetic energy (50–100 days) and transport (20–40 days), but the physical mechanisms controlling this variability are poorly understood. In this study, we...journal article 2018
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Kleptsova, O.S. (author), Pietrzak, J.D. (author)Ice induced variability of tides in the Canadian Arctic Archipelago, including Baffin Bay and Hudson Strait/Hudson Bay system, was studied by means of a new high resolution tidal model. Here we show that the seasonal variations of the tidal constants are significant in the major part of the domain. Month to month changes of the tidal phases...journal article 2018
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Flores, Raúl P. (author), Rijnsburger, S. (author), Meirelles, Saulo (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author), Pietrzak, J.D. (author), Henriquez, M. (author), Reniers, A.J.H.M. (author)Wave-supported gravity flows (WSGFs) generate rates of sediment flux far exceeding other cross-shelf transport processes, contributing disproportionately to shelf morphology and net cross-shelf fluxes of sediment in many regions worldwide. However, the conditions deemed necessary for the formation of WSGF limit them to a narrow set of shelf...journal article 2018
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James, Rebecca K. (author), van Katwijk, Marieke M. (author), Pietrzak, J.D. (author), Candy, A.S. (author), Klees, R. (author), Riva, R.E.M. (author), Slobbe, D.C. (author), Katsman, C.A. (author), Herman, P.M.J. (author)Global oceanic pH is lowering, which is causing great concern for the natural functioning of marine ecosystems. Current pH predictions are based on open ocean models; however, coastal zones are dynamic systems with seawater pH fluctuating temporally and spatially. To understand how coastal ecosystems will respond in the future, we first need...journal article 2019
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James, Rebecca K. (author), Pietrzak, J.D. (author), Candy, A.S. (author), Katsman, C.A. (author), van der Boog, C.G. (author), Riva, R.E.M. (author), Slobbe, D.C. (author), Klees, R. (author)Tropical beaches provide coastal flood protection, income from tourism, and habitat for flagship species. They urgently need protection from erosion, which is being exacerbated by changing climate and coastal development. Traditional coastal engineering solutions are expensive, provide unstable temporary solutions, and often disrupt natural...journal article 2019
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van der Boog, C.G. (author), Pietrzak, J.D. (author), Dijkstra, Henk A. (author), Brüggemann, N. (author), Van Westen, René M. (author), James, Rebecca K. (author), Bouma, Tjeerd J. (author), Riva, R.E.M. (author), Slobbe, D.C. (author), Klees, R. (author), Zijlema, Marcel (author), Katsman, C.A. (author)The mesoscale variability in the Caribbean Sea is dominated by anticyclonic eddies that are formed in the eastern part of the basin. These anticyclones intensify on their path westward while they pass the coastal upwelling region along the Venezuelan and Colombian coast. In this study, we used a regional model to show that this westward...journal article 2019