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Geevers, S. (author), Mulder, W.A. (author), van der Vegt, J (author)We present a new accuracy condition for constructing mass-lumped elements. This condition is less restrictive than the one previously used and enabled us to construct new mass-lumped tetrahedral elements for 3D wave propagation modelling. The new degree-2 and degree-3 elements require significantly fewer nodes than previous versions and mass...abstract 2019
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- Azpiroz Zabala, M. (author), Storms, J.E.A. (author), van der Vegt, H. (author), Walstra, D.J.R. (author), Obradors-Latre, Arnau (author), Pontén, Anna (author) abstract 2019
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- van der Vegt, H. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author), Li, L. (author), Nordahl, Kjetil (author), Martinius, A.W. (author), Howes, Nick (author) abstract 2017
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van der Vegt, H. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author), Li, L. (author), Howes, N.C. (author), Nordahl, Kjetil (author), Martinius, A.W. (author)Geological models are generated by interpretation and interpolation of sparse data. To limit uncertainty, relevant analogues are used to extrapolate knowledge of previously studied, well understood systems. However, these analogues only provide a snapshot of deposition. During delta progradation, sediment will not only be deposited, but is also...abstract 2017
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van der Vegt, H. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author), Li, L. (author), Nordahl, Kjetil (author), Martinius, A.W. (author), Howes, N.C. (author)In deltaic deposits, the largest volumes of sandy deposits occur at the delta top (as channel accretion, overbank deposits) and as distinct or amalgamated sandy mouth bars in the upper delta front. We use process-based models to study the sediment distribution in four evolving deltas, each with a different input sediment profile. We show how the...abstract 2018
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Geevers, Sjoerd (author), van der Vegt, Jaap (author), Mulder, W.A. (author)We present and analyse a Symmetric Interior Penalty Discontinuous Galerkin (SIPDG) method combined with an explicit hybrid Local Time Stepping (LTS) scheme for solving seismic wave problems in heterogeneous anisotropic elastic media. The discontinuous Galerkin method allows for local adjustment of the mesh size and approximation order, and can...abstract 2016
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van der Vegt, H. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author)The assessment and production of hydrocarbon resources incorporates geological models created from core and wireline well data, as well as seismic data. This data is spatially discrete but is used create a spatially continuous model. However, the heterogeneity within depositional environments is on a smaller spatial scale than the available data...conference paper 2014
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Reniers, A.J.H.M. (author), de Wit, F.P. (author), Tissier, M.F.S. (author), Pearson, S.G. (author), Brakenhof, L.B. (author), van der Vegt, M. (author), Mol, J. (author), van Prooijen, Bram (author)A combination of observations and modeling of wave-and current-related sediment transport at the ebb-tidal delta of Ameland, The Netherlands, has been used to examine the dominant sediment transport contributions shaping the ebb-tidal delta. The calibrated model shows a good comparison with the observations for a range of conditions. The results...conference paper 2019
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Geevers, S. (author), Mulder, W.A. (author), van der Vegt, J.J.W. (author)Spectral elements with mass lumping allow for explicit time stepping and are therefore attractive for modelling seismic wave propagation. Their formulation on rectangular elements is straighforward, but for tetrahedra only elements up to degree 3 are known. To preserve accuracy after mass lumping, these elements require additional nodes that...conference paper 2018
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Mulder, W.A. (author), Geevers, S. (author), van der Vegt, J. (author)Mass-lumped finite elements on tetrahedra offer more flexibility than their counterpart on hexahedra for the simulation of seismic wave propagation, but there is no general recipe for their construction, unlike as with hexahedra. Earlier, we found new elements up to degree 4 that have significantly less nodes than previously known elements by...conference paper 2019
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- van der Vegt, Jacobus Jozef Wilhelmus (author) doctoral thesis 1988
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van der Vegt, H. (author)Geological reservoir models, created based on sparse core and seismic data, inform hydrocarbon production, geothermal applications and aquafer management. Important factors contributing to reservoir quality in these applications include the heterogeneities within and connectivity between the relevant geo‐bodies constituting the reservoir. The...doctoral thesis 2018
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Pearson, S.G. (author), Elias, Edwin (author), van Prooijen, Bram (author), van der Vegt, H. (author), van der Spek, A.J.F. (author), Wang, Zhengbing (author)Ebb tidal deltas (ETDs) are highly dynamic features of sandy coastal systems, and coastal management concerns (e.g., nourishment and navigation) present a pressing need to better describe and quantify their evolution. Here we propose two techniques for leveraging the availability of high-resolution bathymetric surveys to generate new insights...journal article 2022
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Miller, Seirgei (author), Chakraborty, Joyraj (author), van der Vegt, Jurian (author), Brinkerink, Daan (author), Erkens, S. (author), Liu, X. (author), Anupam, K. (author), Sluer, Berwich (author), Mohajeri, Mohamad (author)The Fibre Bragg Gratings (FBG) technology based on integrated photonics, offers specific benefits including thermal mapping, damage detection, shape- and distributed sensing. This makes it useful for determining pavement behaviour during extreme weather conditions e.g. freeze-thaw cycles when harsh winter conditions could damage the asphalt...journal article 2017
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Valencia, A.A. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author), van der Vegt, Helena (author), Jagers, Hendrik R.A. (author)In natural deltaic settings, mixed hydrodynamic forcings and sediment properties are known to influence the preserved delta deposits. One process that has not received much attention yet is syn-sedimentary compaction of clastic sediment on millennial-scale delta evolution. To study how compaction interacts with delta morphodynamics and...journal article 2022
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Hoppe, T. (author), van der Vegt, Arjen (author), Stegmaier, Peter (author)Academic attention to local climate policy usually focuses on large-sized cities. Given the climate challenges ahead this seems unjustified. Small and medium-sized cities (SMCs) deserve scholarly attention as well. The main question is: What factors influence climate change policy and local climate actions in SMCs? In this article we present...journal article 2016
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Li, Jiaguang (author), van der Vegt, Helena (author), Storms, J.E.A. (author), Tooth, Stephen (author)Crevasse splays generate subtle local relief and contribute to fluvial basin sedimentary filling but controls on splay development along dryland rivers remain poorly understood owing to limited field, laboratory, and numerical modelling studies. Based on previously-acquired field data and new remote sensing observations of splay morphology...journal article 2023
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van der Vegt, H. (author), Storms, J.E.A. (author), Walstra, D.J.R. (author), Howes, N.C. (author)Abstract Understanding the processes and conditions at the time of deposition is key to the development of robust geological models which adequately approximate the heterogeneous delta morphology and stratigraphy they represent. We show how the mechanism of sediment transport (the proportion of the sediment supply transported as bed load vs....journal article 2016
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Geevers, S. (author), Mulder, W.A. (author), van der Vegt, J. J.W. (author)We present a new accuracy condition for the construction of continuous mass-lumped elements. This condition is less restrictive than the one currently used and enabled us to construct new mass-lumped tetrahedral elements of degrees 2 to 4. The new degree-2 and degree-3 tetrahedral elements require 15 and 32 nodes per element, respectively, while...journal article 2018
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Geevers, S. (author), Mulder, W.A. (author), van der Vegt, J. J.W. (author)We analyse the dispersion properties of two types of explicit finite element methods for modelling acoustic and elastic wave propagation on tetrahedral meshes, namely mass-lumped finite element methods and symmetric interior penalty discontinuous Galerkin methods, both combined with a suitable Lax–Wendroff time integration scheme. The...journal article 2018
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