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Le, Hoang Anh (author), Lambrechts, Jonathan (author), Ortleb, Sigrun (author), Gratiot, Nicolas (author), Deleersnijder, E.L.C. (author), Soares-Frazão, Sandra (author)The accurate simulation of wetting–drying processes in floodplains and coastal zones is a challenge for hydrodynamic modelling, especially for long time simulations. Indeed, dedicated numerical procedures are generally time-consuming, instabilities can occur at the wet/dry front, rapid transition of wet/dry interface and mass conservation are...journal article 2020
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Le, Hoang-Anh (author), Gratiot, Nicolas (author), Santini, William (author), Ribolzi, Olivier (author), Tran, Duc (author), Meriaux, Xavier (author), Deleersnijder, E.L.C. (author), Soares-Frazão, Sandra (author)The Mekong river is one of the largest rivers in the world, which flows through six countries of Southeast Asia (China, Myanmar, Laos, Thailand, Cambodia and Vietnam). Its hydro-sedimentary regime is changing rapidly, as a consequence of a regional shift of land use (agriculture, road, etc.), damming, sand mining and climate changes, among...journal article 2020
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Kästner, K. (author), Hoitink, A.J.F. (author), Torfs, P. J. J. F. (author), Deleersnijder, E.L.C. (author), Ningsih, N.S. (author)Conceptually, tidal rivers are seen as narrow channels along which the cross-section geometry remains constant and the bed is horizontal. As tidal waves propagate along such a channel, they decrease exponentially in height. The more rapid the decrease, the stronger the river flow. Near the coast, the tidally averaged width and depth change...journal article 2019
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Vincent, David (author), Lambrechts, Jonathan (author), Karatekin, Özgur (author), Van Hoolst, Tim (author), Tyler, Robert H. (author), Dehant, Véronique (author), Deleersnijder, E.L.C. (author)The natural modes of Ontario Lacus surface oscillations, the largest lake in Titan’s southern hemisphere, are simulated and analyzed as they are potentially of broad interest in a variety of dynamical researches. We found that tidal forces are too low in frequency to excite the (barotropic) normal modes. Broadband wind forcing likely spans...journal article 2019
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van Sebille, Erik (author), Deleersnijder, E.L.C. (author), Heemink, A.W. (author), Griffies, Stepehn M. (author), Abernathey, Ryan (author), Adams, Thomas P. (author), Berloff, Pavel (author), Biastoch, Arne (author), Blanke, Bruno (author), Chassignet, Eric P. (author)Lagrangian analysis is a powerful way to analyse the output of ocean circulation models and other ocean velocity data such as from altimetry. In the Lagrangian approach, large sets of virtual particles are integrated within the three-dimensional, time-evolving velocity fields. Over several decades, a variety of tools and methods for this...review 2018
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Vallaeys, Valentin (author), Kärnä, Tuomas (author), Delandmeter, Philippe (author), Lambrechts, Jonathan (author), Baptista, António M. (author), Deleersnijder, E.L.C. (author), Hanert, Emmanuel (author)The Columbia River (CR) estuary is characterized by high river discharge and strong tides that generate high velocity flows and sharp density gradients. Its dynamics strongly affects the coastal ocean circulation. Tidal straining in turn modulates the stratification in the estuary. Simulating the hydrodynamics of the CR estuary and plume...journal article 2018
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Delandmeter, Philippe (author), Lambrechts, Jonathan (author), Legat, Vincent (author), Vallaeys, Valentin (author), Naithani, Jaya (author), Thiery, Wim (author), Remade, Jean-François (author), Deleersnijder, E.L.C. (author)The discontinuous Galerkin (DG) finite element method is well suited for the modelling, with a relatively small number of elements, of three-dimensional flows exhibiting strong velocity or density gradients. Its performance can be highly enhanced by having recourse to r-adaptivity. Here, a vertical adaptive mesh method is developed for DG finite...journal article 2018
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Cushman-Roisin, Benoit (author), Deleersnijder, E.L.C. (author)The analytical solution is derived for rotational frictional flow in a shallow layer of fluid in which the top and bottom Ekman layers join without leaving a frictionless interior.This vertical structure has significant implications for the horizontal flow. In particular, for a layer of water subjected to both a surface wind stress and bottom...journal article 2018
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Le, Hoang-Anh (author), Gratiot, Nicolas (author), Santini, William (author), Ribolzi, Olivier (author), Soares-Frazão, Sandra (author), Deleersnijder, E.L.C. (author)The Mekong river, located in Southeast Asia, is one of the largest rivers in the world. It is facing serious problems related to sediment transport, e.g. the reduction of sediment volume supply to the delta and estuary. This study focuses on the physical properties of suspended particles in the upstream fluvial section (Luang Prabang, Laos)...journal article 2018
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Wolanski, E. (author), Andutta, F. (author), Deleersnijder, E.L.C. (author), Li, Y. (author), Thomas, C.J. (author)The 2015/16 ENSO event increased the temperature of waters surrounding northeast Australia to above 30 °C, with large patches of water reaching 32 °C, for over two months, which led to severe bleaching of corals of the Northern Great Barrier Reef (NGBR). This study provides evidence gained from remote-sensing data, oceanographic data and...journal article 2017
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Delandmeter, Philippe (author), Lambrechts, Jonathan (author), Marmorino, George O. (author), Legat, Vincent (author), Wolanski, Eric (author), Remacle, Jean-François (author), Chen, Wei (author), Deleersnijder, E.L.C. (author)Interaction of tidal flow with a complex topography and bathymetry including headlands, islands, coral reefs and shoals create a rich submesoscale field of tidal jets, vortices, unsteady wakes, lee eddies and free shear layers, all of which impact marine ecology. A unique and detailed view of the submesoscale variability in a part of the...journal article 2017
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Syed, H.A.M.S. (author), Primeau, F.W. (author), Deleersnijder, E.L.C. (author), Heemink, A.W. (author)Lagrangian forward and backward models are introduced into a coarse-grid ocean global circulation model to trace the ventilation routes of the deep North Pacific Ocean. The random walk aspect in the Lagrangian model is dictated by a rotated isopycnal diffusivity tensor in the circulation model, and the effect of diffusion is explicitly...journal article 2017
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Vincent, David (author), Karatekin, Özgur (author), Vallaeys, Valentin (author), Hayes, Alexander G (author), Mastrogiuseppe, Marco (author), Notarnicola, Claudia (author), Dehant, Véronique (author), Deleersnijder, E.L.C. (author)In the context of the emergence of extraterrestrial oceanography, we adapted an existing oceanographic model, SLIM (www.climate.be/slim), to the conditions of Titan, a moon of Saturn. The tidal response of the largest southern lake at Titan’s surface, namely Ontario Lacus, is simulated. SLIM solves the 2D, depth-averaged shallow water equations...journal article 2016
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- Naithani, J. (author), de Brye, B. (author), Buyze, E. (author), Vyverman, W. (author), Legat, Vincent (author), Deleersnijder, E.L.C. (author) journal article 2016
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Mouchet, A. (author), Cornaton, F. (author), Deleersnijder, E.L.C. (author), Delhez, E.J.M. (author)The concept of age is widely used to quantify the transport rate of tracers - or pollutants - in the environment. The age focuses only on the time taken to reach a given location and disregards other aspects of the path followed by the tracer parcel. To keep track of the subregions visited by the tracer parcel along this path, partial ages are...journal article 2016
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Pham Van, Chien (author), de Brye, Benjamin (author), Deleersnijder, E.L.C. (author), Hoitink, A. J F (author), Sassi, Maximiliano (author), Spinewine, Benoit (author), Hidayat, Hidayat (author), Soares-Frazão, Sandra (author)Large rivers often present a river–lake–delta system, with a wide range of temporal and spatial scales of the flow due to the combined effects of human activities and various natural factors, e.g., river discharge, tides, climatic variability, droughts, floods. Numerical models that allow for simulating the flow in these river–lake–delta...journal article 2016
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Pham Van, Chien (author), Gourgue, Olivier (author), Sassi, Maximiliano (author), Hoitink, Ton (author), Deleersnijder, E.L.C. (author), Soares-Frazão, Sandra (author)SLIM is an unstructured mesh, finite element model of environmental and geophysical fluid flows, which is being improved to simulate fine-grained sediment transport in riverine and marine water systems. A 2D depth-averaged version of the model is applied to the Mahakam Delta (Borneo, Indonesia), the adjacent ocean, and three lakes in the central...journal article 2016
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Andutta, Fernando P. (author), Helfer, Fernanda (author), de Miranda, Luiz Bruner (author), Deleersnijder, E.L.C. (author), Thomas, Christopher (author), Lemckert, Charles (author)Transport timescales (TTS), namely residence time and exposure time, were computed for adjacent shallow meso-tidal tropical estuarines system using the Lagrangian model D-Waq Part coupled with the hydrodynamic model Delft3D-Flow, and the Constituent-oriented Age and Residence time Theory, CART. The main results are threefold: (a) The TTS...journal article 2016
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- Blaise, Sébastien (author), Lambrechts, Jonathan (author), Deleersnijder, E.L.C. (author) journal article 2015
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Gräwe, U. (author), Deleersnijder, E. (author), Shah, S.H.A.M. (author), Heemink, A.W. (author)During the last decades, the Euler scheme was the common “workhorse” in particle tracking, although it is the lowest-order approximation of the underlying stochastic differential equation. To convince the modelling community of the need for better methods, we have constructed a new test case that will show the shortcomings of the Euler scheme....journal article 2012
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