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Vasarmidis, Panagiotis (author), Klonaris, Georgios (author), Zijlema, Marcel (author), Stratigaki, Vasiliki (author), Troch, Peter (author)Despite the increasing use of non-hydrostatic models in the study of wave processes in coastal regions, there is still limited understanding of the non-linear properties of the governing equations and how they improve with increased vertical resolution. In this study, the governing equations of the non-hydrostatic wave model SWASH are...journal article 2024
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Akrish, G. (author), Reniers, A.J.H.M. (author), Zijlema, Marcel (author), Smit, P.B. (author)Coastal wave forecasting over large spatial scales is essential for many applications (e.g., coastal safety assessments, coastal management and developments, etc.). This demand explains the necessity for accurate yet effective models. A well-known efficient modelling approach is the quadratic approach (often referred to as frequency-domain...journal article 2024
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Akrish, G. (author), Reniers, A.J.H.M. (author), Zijlema, Marcel (author), Smit, P.B. (author)Spectral information of coastal waves and the associated statistical parameters (e.g., the significant wave height and mean wave period) over large spatial scales is essential for many applications (e.g., coastal safety assessments, coastal management and developments, etc.). This demand explains the necessity for accurate yet effective...journal article 2024
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Akrish, G. (author), Smit, Pieter (author), Zijlema, Marcel (author), Reniers, A.J.H.M. (author)Weyl rule of association, proposed by Hermann Weyl for quantum mechanics applications (Weyl, 1931), can be used to associate between the dispersion relation of water waves and a non-local pseudo-differential operator. The central result of this study is that this operator correctly approximates the Dirichlet-to-Neumann operator derived for...journal article 2023
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- van Alderwegen, E. (author), Mosselman, E. (author), Zijlema, A. (author), Bahrami-Yarahmadi, M. (author), Reedijk, B (author) conference paper 2022
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Reniers, A.J.H.M. (author), Zijlema, Marcel (author)The Simulating WAves Nearshore (SWAN) model has been extended with an infragravity module to predict the Wave-Group-Forced (WGF) infragravity response to a frequency-directional sea-swell spectrum at a mildly sloping alongshore uniform beach. To that end the SWAN model has been extended with an WGF-infragravity source term denoted S<sub>sb<...journal article 2022
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da Silva, Renan F. (author), Rijnsdorp, D.P. (author), Hansen, Jeff E. (author), Lowe, Ryan (author), Buckley, Mark (author), Zijlema, Marcel (author)Analysis of the mean (wave-averaged) momentum balance is a common approach used to explain the physical forcing driving wave set-up and mean currents in the nearshore zone. Traditionally this approach has been applied to phase-averaged models but has more recently been applied to phase-resolving models using post-processing, whereby model...journal article 2021
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Vasarmidis, Panagiotis (author), Stratigaki, Vasiliki (author), Suzuki, T. (author), Zijlema, Marcel (author), Troch, Peter (author)The weakly reflective wave generation is a wave generation and absorption method in phase-resolving models, based on the assumption that the waves propagating towards the wave generation boundary are small amplitude shallow water waves with direction perpendicular to the boundary. This assumption makes the method weakly reflective for...journal article 2021
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Keyzer, L.M. (author), Herman, P.M.J. (author), Smits, B.P. (author), Pietrzak, J.D. (author), James, R.K. (author), Candy, A.S. (author), Riva, R.E.M. (author), Bouma, T.J. (author), van der Boog, C.G. (author), Katsman, C.A. (author), Slobbe, D.C. (author), Zijlema, Marcel (author), van Westen, R.M. (author), Dijkstra, H.A. (author)Shallow tropical bays in the Caribbean, like Orient Bay and Galion Bay in Saint Martin, are often sheltered by coral reefs. In the relatively calm environment behind the reefs, seagrass meadows grow. Together, these ecosystems provide valuable ecosystem services like coastal protection, biodiversity hotspots, nursery grounds for animals and...journal article 2020
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Phan Khanh, L. (author), Stive, M.J.F. (author), Zijlema, Marcel (author), Truong, H.T.X. (author), Aarninkhof, S.G.J. (author)Wave attenuation through mangrove forests has received more and more attention, especially in the context of increasing coastal erosion and sea-level-rise. Numerous studies have focused on studying the reduction of wave height in a mangrove forest. However, the understanding of this attenuation process is still in its infancy. In order to obtain...journal article 2019
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Suzuki, T. (author), Hu, Zhan (author), Kumada, Kenji (author), Phan Khanh, L. (author), Zijlema, Marcel (author)A new wave-vegetation model is implemented in an open-source code, SWASH (Simulating WAves till SHore). The governing equations are the nonlinear shallow water equations, including non-hydrostatic pressure. Besides the commonly considered drag force induced by vertical vegetation cylinders, drag force induced by horizontal vegetation cylinders...journal article 2019
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Vasarmidis, Panagiotis (author), Stratigaki, Vasiliki (author), Suzuki, T. (author), Zijlema, Marcel (author), Troch, Peter (author)In this work, internal wave generation techniques are developed in an open source non-hydrostatic wave model (SimulatingWAves till SHore, SWASH) for accurate generation of regular and irregular long-crested waves. Two different internal wave generation techniques are examined: a source term addition method where additional surface elevation is...journal article 2019
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Zhang, R. (author), Zijlema, Marcel (author), Stive, M.J.F. (author)In this paper, the ability of the numerical phase resolving model SWASH (Simulating WAves till SHore) to hindcast wave-induced longshore currents is evaluated. Using default settings for all processes modelled, highly accurate results are found for wave heights, mean water levels and longshore currents. While wave current interaction is...journal article 2018
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Hilgersom, K.P. (author), Zijlema, Marcel (author), van de Giesen, N.C. (author)The three-dimensional (3-D) modelling of water systems involving double-diffusive processes is challenging due to the large computation times required to solve the flow and transport of constituents. In 3-D systems that approach axisymmetry around a central location, computation times can be reduced by applying a 2-D axisymmetric model set-up....journal article 2018
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Rijnsdorp, D.P. (author), Smit, Pieter B. (author), Zijlema, Marcel (author), Reniers, A.J.H.M. (author)Wave-induced currents are an ubiquitous feature in coastal waters that can spread material over the surf zone and the inner shelf. These currents are typically under resolved in non-hydrostatic wave-flow models due to computational constraints. Specifically, the low vertical resolutions adequate to describe the wave dynamics – and required to...journal article 2017
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Hilgersom, K.P. (author), Zijlema, Marcel (author), van de Giesen, N.C. (author)The three-dimensional (3-D) modelling of water systems involving double-diffusive processes is challenging due to the large computation times required to solve the flow and transport of constituents. In systems that approach axisymmetry around a central location, computation times can be reduced by applying a quasi 3-D axisymmetric model setup....journal article 2016
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Van Vledder, G.P. (author), Zijlema, M. (author)The determination of wave conditions in partly sheltered areas is a challenging task for coastal engineers. Knowledge about these conditions is important for the design of coastal structures, the planning and operation of ports. Numerical models play an important role in the assessment of these conditions. Various types of models have been...conference paper 2014
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Zijlema, M. (author)This paper presents the application of the open source non-hydrostatic wave-flow model SWASH to propagation of irregular waves in a barred surf zone, and the model results are discussed by comparing against an extensive laboratory data set. This study focus not only on wave transformation in the surf zone, but also on the numerical prediction of...conference paper 2014
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Van den Bos, J. (author), Verhagen, H.J. (author), Zijlema, M. (author), Mellink, B. (author)A more detailed understanding of porous flow inside a rubble-mound structure may have potential benefits in breakwater design. Numerical models are expected to be a useful additional research tool in this field, provided that their calculation results can be validated against measurements. This paper presents the results of a systematic effort...conference paper 2014
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Salmon, J.E. (author), Holthuijsen, L.H. (author), Smit, P.B. (author), Van Vledder, G.P. (author), Zijlema, M. (author)This paper presents the application of new source terms in SWAN for the dominant water wave physics in the coastal zone: depth-induced breaking and triad wave-wave interactions. We present results demonstrating increased modelling skill in the prediction of bulk wave parameters e.g. significant wave height and of the spectral shape compared to...conference paper 2014
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