Searched for: department:"Hydraulic"
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Van Rooijen, A.A. (author), Van Thiel de Vries, J.S.M. (author), McCall, R.T. (author), Van Dongeren, A.R. (author), Roelvink, J.A. (author), Reniers, A.J.H.M. (author)
Over the past decades the effect of vegetation (e.g. kelp, mangroves, sea grass) on nearshore coastal processes has received more and more attention. In recent years several numerical wave models have been extended to include this effect. In the current study, the numerical storm impact model XBeach was extended with formulations found in...
conference paper 2015
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Guo, L. (author), Van der Wegen, M. (author), Jay, D.A. (author), Matte, P. (author), Wang, Z.B. (author), Roelvink, J.A. (author), He, Q. (author)
River-tide dynamics remain poorly understood, in part because conventional harmonic analysis (HA) does not cope effectively with nonstationary signals. To explore nonstationary behavior of river tides and the modulation effects of river discharge, this work analyzes tidal signals in the Yangtze River estuary using both HA in a nonstationary mode...
journal article 2015
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Omer, A.Y.A. (author), Ali, Y.S.A. (author), Roelvink, J.A. (author), Dastgheib, A. (author), Paron, P. (author), Crosato, A. (author)
Roseires Reservoir, located on the Blue Nile River in Sudan, is the first trap to the sediments coming from the vast upper river catchment in Ethiopia, which suffers from high erosion and desertification problems. The reservoir has already lost more than one-third of its storage capacity due to sedimentation in the last four decades. Appropriate...
journal article 2015
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Guo, L. (author), Van der Wegen, M. (author), Roelvink, J.A. (author), He, Q. (author)
Numerous research efforts have been devoted to understanding estuarine morphodynamics under tidal forcing. However, the impact of river discharge on estuarine morphodynamics is insufficiently examined. Inspired by the Yangtze Estuary, this work explores the morphodynamic impact of river discharge in a 560 km long tidal basin based on a 1-D model...
journal article 2014
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Reyns, J. (author), Dastgheib, A. (author), Ranasinghe, R.W.M.R.J.B. (author), Luijendijk, A.P. (author), Walstra, D.J.R. (author), Roelvink, J.A. (author)
A hampering factor in the application of morphodynamic models is the potential excessive time needed to complete a simulation. One way to upscale a model run is the use of a morphological factor, or MORFAC. In this paper, we investigate the upper limit to the value of the MORFAC as a function of model geometry and timestep for a schematized case...
conference paper 2014
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Omer, A.Y.A. (author), Ali, Y.S.A. (author), Roelvink, J.A. (author), Dastgheib, A. (author), Paron, P. (author), Crosato, A. (author)
Discussion paper. Roseires Reservoir, located on the Blue Nile River, in Sudan, is the first trap to the sediments coming from the upper catchment in Ethiopia, which suffers from high erosion and desertification problems. The reservoir lost already more than one third of its 5 storage capacity due to sedimentation in the last four decades....
journal article 2014
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Roelvink, D. (author), Den Heijer, C. (author), Van Thiel De Vries, J.S.M. (author)
Land reclamations and island coasts often involve strongly curved shorelines, which are challenging to be properly modeled by numerical morphological models. Evaluation of the long term development of these types of coasts as well as their response to storm conditions requires proper representation of the governing physical processes. Not all...
conference paper 2013
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Van Dongeren, A. (author), Van Ormondt, M. (author), Sembiring, L. (author), Sasso, R. (author), Austin, M. (author), Briere, C. (author), Swinkels, C. (author), Roelvink, J.A. (author), Van Thiel De Vries, J.S.M. (author)
This paper describes the development of a physics-based rip current prediction system called CoSMoS. This system consists of a hydrodynamic prediction system which is composed of a train of surge and wave models from the global scale to the scale of a beach resort (order kilometers). For the beach resort scale model, it is of utmost importance...
conference paper 2013
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Ranasinghe, R.W.M.R.J.B. (author), Callaghan, D. (author), Roelvink, D. (author)
The dependency between the accuracy/uncertainty of storm erosion exceedance estimates obtained via a probabilistic model and the level of sophistication of the structural function (storm erosion model) embedded in the probabilistic model is assessed via the application of Callaghan et al.'s (2008) Joint Probability Model (JPM) at Narrabeen beach...
conference paper 2013
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Huisman, B.J.A. (author), Van Thiel De Vries, J.S.M. (author), Walstra, D.J.R. (author), Roelvink, J.A. (author), Ranasinghe, R.W.M.R.J.B. (author), Stive, M.J.F. (author)
Understanding of the behaviour of coastline perturbations at soft-coastlines is essential for modelling coastal evolution at decadal time scales. Many coastline models do, for example, implicitly assume dominant diffusive behaviour of coastline features. The validity of this assumption is investigated for the Dutch coast on the basis of data on...
conference paper 2013
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Pomeroy, A.W.M. (author), Lowe, R.J. (author), Bowyer, C. (author), Zhang, Z. (author), Falter, J. (author), Van Dongeren, A. (author), Roelvink, D. (author)
conference paper 2013
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de Zeeuw, R.C. (author), de Schipper, M.A. (author), Roelvink, D. (author), de Vries, S. (author), Stive, M.J.F. (author)
Assessing swimmer safety along the Dutch coast entails more than only assessing the risk of rip currents. Seven criteria have been formulated to make a comprehensive assessment of swimmer safety along the Dutch coast. These are based on interviews with lifeguards, rescue report statistics and detailed lagrangian measurements of the current...
conference paper 2012
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Dastgheib, A. (author), Roelvink, J.A. (author)
Constructing a closure dam such as Afsluitdijk causes an instantaneous change in tidal wave propagation and flow field in the basin which triggers extensive morphological changes in the adjacent tidal basin. These morphological changes may continue for centuries before the whole system reaches a new "equilibrium" state, which is different from...
conference paper 2012
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Blossier, B. (author), Briere, C. (author), Roelvink, J.A. (author), Walstra, D.J.R. (author)
Sand beach profiles can exhibit nearshore sandbars with complex 3D patterns. Under energetic conditions, these patterns disappear and the bars get to a certain extent alongshore uniform. This phenomenon is called a reset. The existing literature mainly concerns the development of the bar patterns (3D) or the cross-shore migration of sandbars (2D...
conference paper 2012
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Pomeroy, A.W.M. (author), van Dongeren, A. (author), Lowe, R.J. (author), Van Thiel de Vries, J.S.M. (author), Roelvink, J.A. (author)
Low frequency wave resonance has been postulated to enhance damage to coral reef protected coastlines during storm events. This paper uses the numerical model XBeach to examine the dynamics that contribute to resonance that have been previously observed on a fringing reef on Guam during tropical storm Man-Yi (PĂ©quignet et al., 2009). The methods...
conference paper 2012
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Ali, Y.S.A. (author), Roelvink, J.A. (author), Wright, N.G. (author), Mohamed, Y.A. (author), Crosato, A. (author)
In the Nile River Basin, upstream runoff variability is an acute issue to downstream countries, since these countries are almost entirely dependent on Nile waters. Cooperative management of the Nile waters has become urgent, considering climate variations (Conway, 2005; Yates & Strzepek, 1998 a) and the necessity to use the water resource for...
conference paper 2012
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Ranasinghe, R.W.M.R.J.B. (author), Holman, R. (author), De Schipper, M.A. (author), Lippmann, T. (author), Wehof, J. (author), Duong, T.M. (author), Roelvink, D. (author), Stive, M.J.F. (author)
Time scales of post-storm nearshore morphological recovery and physical processes governing these time scales are poorly understood at present. The ability to predict nearshore morphological recovery time scales based on pre-, during- or post-resetting storm conditions is an essential requirement for building and validating scale aggregated...
conference paper 2012
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Roelvink, D. (author), Stelling, G. (author), Hoonhout, B.M. (author), Risandi, J. (author), Jacobs, W. (author), Merli, D. (author)
The formulations of the 2DH process-based, nearshore morphological model XBeach were extended to allow for curvilinear grids using a finite volume approach. The formulations were tested for schematic cases such as a circular island and a field validation study was carried out for the case of storm erosion during a construction phase of the soft...
conference paper 2012
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Muller, M.C. (author), Roelvink, D. (author), Luijendijk, A.P. (author), De Vries, S. (author), Van Thiel de Vries, J.S.M. (author)
In this paper, the aeolian transport model DUNE (Sauermann et al., 2001, Kroy et al., 2002) that describes important features and dynamics of typical desert dunes, is extended such that it can be applied in sandy coastal areas. Initial tests explore the limitations of the model in coastal areas after which adaptations are proposed and...
conference paper 2012
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Dissanayake Mudiyanselage, P.K.D. (author), Ranasinghe, R.W.M.R.J.B. (author), Roelvink, J.A. (author)
journal article 2012
Searched for: department:"Hydraulic"
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