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Dijkstra, Y.M. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author)We investigate the hypothesis by Winterwerp and Wang (Ocean Dyn 63:1279–1292, 2013) that channel deepening in the Scheldt River Estuary could lead to a large increase in suspended sediment concentrations, with subsequent severe consequences to primary production and navigation. To this end, we use an idealised model to investigate the long...journal article 2019
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Brouwer, R.L. (author), Schramkowski, G.P. (author), Dijkstra, Y.M. (author), Schuttelaars, H.M. (author)Using an idealized width-averaged process-based model, the role of a mud pool on the bed and time-varying river discharge on the trapping of fine sediment is systematically investigated. For this purpose, a dynamically and physically motivated description of erodibility is presented, which relates the amount of sediment on the bed to the...journal article 2018
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Wei, X. (author), Kumar, M. (author), Schuttelaars, H.M. (author)To investigate the dominant sediment transport and trapping mechanisms, a semi-analytical three-dimensional model is developed resolving the dynamic effects of salt intrusion on sediment in well-mixed estuaries in morphodynamic equilibrium. As a study case, a schematized estuary with a converging width and a channel-shoal structure...journal article 2018
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Dijkstra, Y.M. (author), Schuttelaars, H.M. (author), Winterwerp, J.C. (author)Over the last few decades, some estuaries have undergone a transition to a hyperturbid state, characterised by suspended sediment concentrations of several grammes per litre averaged over the water column. To improve our understanding of this transition and of naturally hyperturbid estuaries, we systematically identify the processes allowing...journal article 2018
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Dijkstra, Y.M. (author), Brouwer, R.L. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author)The iFlow modelling framework is a width-averaged model for the systematic analysis of the water motion and sediment transport processes in estuaries and tidal rivers. The distinctive solution method, a mathematical perturbation method, used in the model allows for identification of the effect of individual physical processes on the water...journal article 2017
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Dijkstra, Y.M. (author), Schuttelaars, H.M. (author), Burchard, Hans (author)We present a systematic analysis of generation mechanisms for exchange flows in partially stratified estuaries using water column (1DV) and width-averaged (2DV) numerical models. We focus on exchange flows generated by eddy viscosity-shear covariance (ESCO). We identify two distinctly different physical mechanisms. The first, tidal ESCO...journal article 2017
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Wei, X. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author)Understanding salt dynamics is important to adequately model salt intrusion, baroclinic forcing, and sediment transport. In this paper, the importance of the residual salt transport due to tidal advection in well-mixed tidal estuaries is studied. The water motion is resolved in a consistent way with a width-averaged analytical model, coupled to...journal article 2016
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Wei, X. (author), Kumar, M. (author), Schuttelaars, H.M. (author)Along-channel and cross-channel sediment transport in tidal estuaries is usually driven by tides, density gradients, Coriolis’s force, wind stress, channel curvature and bathymetric variations. Since the water motion is influenced by density-induced gravitational circulation which in turn affects the salinity distribution, the coupled water...abstract 2016
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Chen, Wen L. (author), Roos, Pieter C. (author), Schuttelaars, H.M. (author), Kumar, M. (author), Zitman, T.J. (author), Hulscher, SJMH (author)Because wind is one of the main forcings in storm surge, we present an idealised process-based model to study the influence of topographic variations on the frequency response of large-scale coastal basins subject to time-periodic wind forcing. Coastal basins are represented by a semi-enclosed rectangular inner region forced by wind. It is...journal article 2016
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Kumar, M. (author), Schuttelaars, H.M. (author), Roos, P.C. (author), Möller, M. (author)In this paper, a three-dimensional semi-idealized model for tidal motion in a tidal estuary of arbitrary shape and bathymetry is presented. This model aims at bridging the gap between idealized and complex models. The vertical profiles of the velocities are obtained analytically in terms of the first-order and the second-order partial...journal article 2015
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Schulz, E. (author), Schuttelaars, H.M. (author), Grawe, U. (author), Burchard, H. (author)The dependency of the estuarine circulation on the depth-to-width ratio of a periodically, weakly stratified tidal estuary is systematically investigated here for the first time. Currents, salinity, and other properties are simulated by means of the General Estuarine Transport Model (GETM) in cross-sectional slice mode, applying a symmetric...journal article 2015
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Purkiani, K. (author), Becherer, J. (author), Flöser, G. (author), Gräwe, U. (author), Mohrholz, V. (author), Schuttelaars, H.M. (author), Burchard, H. (author)Stratification and destratification processes in a tidally energetic, weakly stratified inlet in the Wadden Sea (south eastern North Sea) are investigated in this modeling study. Observations of current velocity and vertical density structure show strain-induced periodic stratification for the southern shoal of the tidal channel. In contrast to...journal article 2015
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Gräwe, U. (author), Burchard, H. (author), Müller, M. (author), Schuttelaars, H.M. (author)We use an observational data set of tidal gauges in the North Sea to investigate the annual cycle of the M2 and M4 amplitudes and phases. The sea surface elevation amplitude of the M2 can vary by 8–10% and the M4 amplitude by 12–30% over the course of the year, with larger amplitudes in summer. The annual phase variations are in the range of 3...journal article 2014
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Burchard, H. (author), Schulz, E. (author), Schuttelaars, H.M. (author)Estuarine convergence (landward reduction of width and/or depth) is known to have the potential to significantly enhance estuarine circulation, a result theoretically derived under the assumption of constant eddy viscosity. Recent studies of longitudinally uniform energetic tidal channels indicate that tidal straining, a process driven by...journal article 2014
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Burchard, H. (author), Schuttelaars, H.M. (author), Rockwell Geyer, W. (author)In this idealized numerical modeling study, the composition of residual sediment fluxes in energetic (e.g., weakly or periodically stratified) tidal estuaries is investigated by means of one-dimensional water column models, with some focus on the sediment availability. Scaling of the underlying dynamic equations shows dependence of the results...journal article 2013
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Roos, P.C. (author), Schuttelaars, H.M. (author), Brouwer, R.L. (author)Barrier coasts display a chain of islands, separated by tidal inlets that connect a back-barrier basin to a sea or ocean. Observations show that barrier island length generally decreases for increasing tidal range and increasing basin area. However, this has neither been reproduced in model studies nor explained from the underlying physics. This...journal article 2013
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- Alebregtse, N.C. (author), De Swart, H.E. (author), Schuttelaars, H.M. (author) journal article 2013
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Brouwer, R.L. (author), Schuttelaars, H.M. (author), Roos, P.C. (author)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...conference paper 2012
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Burchard, H. (author), Schuttelaars, H.M. (author)Tidal straining, which can mathematically be described as the covariance between eddy viscosity and vertical shear of the along-channel velocity component, has been acknowledged as one of the major drivers for estuarine circulation in channelized tidally energetic estuaries. In this paper, the authors investigate the role of lateral circulation...journal article 2012
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Zitman, T.J. (author), Schuttelaars, H.M. (author)For a proper understanding of flow patterns in curved tidal channels, quantification of contributions from individual physical mechanisms is essential. We study quantitatively how such contributions are affected by crosschannel bathymetry and three alternative eddy viscosity parameterisations. Two models are presented for this purpose, both...journal article 2012