Searched for: author%3A%22Ranasinghe%2C+R.W.M.R.J.B.%22
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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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Scheel, F. (author), De Boer, W.P. (author), Brinkman, R. (author), Luijendijk, A.P. (author), Ranasinghe, R.W.M.R.J.B. (author)
A variety of uncertainty sources are inherent in process-based morphodynamic modelling applications. There is an increasing demand for the quantification of these uncertainties. This contribution introduces a probabilistic-morphodynamic (PM) modelling framework that enables this quantification. The PM modelling framework provides a systematic...
conference paper 2014
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Stive, M.J.F. (author), De Schipper, M.A. (author), Luijendijk, A.P. (author), Ranasinghe, R.W.M.R.J.B. (author), Aarninkhof, S. (author)
The Netherlands’ strategy to combat coastal erosion since 1990 has been through nourishment, initially as beach nourishments but more and more as shoreface nourishments. In the light of sea level rise projections the yearly nourishment magnitudes continue to increase. In view of this an innovative soft engineering intervention, comprising an...
conference paper 2013
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Wang, L. (author), Van Gelder, P.H.A.J.M. (author), Vrijling, J.K. (author), Ranasinghe, R.W.M.R.J.B. (author), Maskey, S. (author)
To guarantee a safe flood defence in a changing environment, the adaptation to climate change needs to be considered in the design of river dikes. However, the large uncertainty in the projections of future climate leads to varied estimations of future flood probability. How to cope with the uncertainties in future flood probability under...
conference paper 2013
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De Schipper, M.A. (author), De Vries, S. (author), Ranasinghe, R.W.M.R.J.B. (author), Reniers, A. (author), Stive, M.J.F. (author)
The present paper examines the generation and inter-annual evolution of alongshore variability in topography measured after the implementation of a sand nourishment. The magnitude of the topographic variability is quantified using 3.5 years of monthly survey data. The emergence and temporal change in alongshore morphological variability is...
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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Stive, M.J.F. (author), De Schipper, M.A. (author), Luijendijk, A.P. (author), Ranasinghe, R.W.M.R.J.B. (author), Van Thiel De Vries, J.S.M. (author), Aarninkhof, S. (author), Van Gelder-Maas, C. (author), De Vries, S. (author), Henriquez, M. (author), Marx, S. (author)
The Netherlands’ strategy to combat coastal erosion since 1990 has been through nourishment, initially as beach nourishments but more and more as shoreface nourishments. In the light of sea level rise projections the yearly nourishment magnitudes continue to increase. In view of this an innovative soft engineering intervention, comprising an...
conference paper 2013
document
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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Mil Homens, J.P. (author), Ranasinghe, R.W.M.R.J.B. (author), Van Thiel de Vries, J.S.M. (author), Stive, M.J.F. (author)
Longshore sediment transport (LST) is one of the main drivers of beach morphology. Bulk LST formulas are routinely used in coastal management/engineering studies to assess LST rates and gradients. However, there is still great uncertainty in LST estimation with these bulk formulas. This uncertainty may have two sources: 1) experimental errors in...
conference paper 2013
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De Schipper, M.A. (author), De Vries, S. (author), Ranasinghe, R.W.M.R.J.B. (author), Reniers, A.J.H.M. (author), Stive, M.J.F. (author)
Typically a beach is out of equilibrium after a nourishment is installed. To observe how a nourished beach behaves on the timescale of storms a monitoring campaign was set up at Vlugtenburg beach after a nourishment in the spring of 2009. Here we show a sediment budget analysis of the first 2.5 years for a coastal domain spanning 1750 m...
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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De Schipper, M.A. (author), Reniers, A. (author), MacMahan, J. (author), Ranasinghe, R.W.M.R.J.B. (author)
Field observations and numerical model simulations are examined to investigate the magnitude of vortical very low frequency (VLF) velocity fluctuations (i.e. large scale surfzone eddies) under different offshore wave forcing. Observations of vortical VLF motions under shore -normal wave incidence at Duck, NC, USA are re-analyzed and compared...
conference paper 2012
document
Mil-Homens, J.P. (author), Ranasinghe, R.W.M.R.J.B. (author), Van Thiel de Vries, J.S.M. (author), Stive, M.J.F. (author)
Longshore sediment transport (LST) is one of the main drivers of beach morphology. Bulk LST formulas are routinely used in coastal management/engineering studies to assess LST rates and gradients. Over 50 years of research has resulted in several bulk LST formulas that have been tested with varying levels of rigor. In this study, the predictive...
conference paper 2012
document
De Vries, S. (author), Southgate, H.N. (author), Kanning, W. (author), Ranasinghe, R.W.M.R.J.B. (author)
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
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Geldenhuys, M.A. (author), Jonkman, S.N. (author), Mather, A.A. (author), Ranasinghe, R.W.M.R.J.B. (author), Stive, M.J.F. (author), Van Ledden, M. (author)
Recent research done the IPCC (2007) working groups and other organizations has sparked global concern over the possible impacts of climate change and corresponding sea level rise (SLR) upon coastal communities. In reaction studies were done (for example by Nicholls et al., 2008) to assess the vulnerability of coastal regions and get an...
conference paper 2012
document
De Vries, S. (author), De Schipper, M.A. (author), Ranasinghe, R.W.M.R.J.B. (author), Stive, M.J.F. (author)
The coastal system consists of a sub-aqueous and a sub-aerial zone which can be separated by a border. At this border sediment exchange takes place from one zone to the other. This paper hypothesizes that conditions and therefore sediment exchange at this border are dependent on active profile characteristics. To analyze morphological...
conference paper 2011
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Jongejan, R.B. (author), Ranasinghe, R.W.M.R.J.B. (author), Vrijling, J.K. (author)
Economic and population growth have led to an unprecedented increase in the value at risk in coastal zones over the last century. To avoid excessive future losses, particularly in the light of projected climate change impacts, coastal zone managers have various instruments at their disposal. These primarily concern land-use planning ...
conference paper 2011
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De Schipper, M.A. (author), Ranasinghe, R.W.M.R.J.B. (author), Reniers, A.J.H.M. (author), Stive, M.J.F. (author)
Nearshore rhythmicity is often initiated in the period just after a storm where the subtidal bar is turned alongshore uniform. The initiation time as well as the length scales of the created rhythmicity varies from one storm period to another. Here we show that the post-storm wave conditions are related to the initiation of the morphological...
conference paper 2010
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Stive, M.J.F. (author), Ji, L. (author), Brouwer, R.L. (author), Van de Kreeke, J. (author), Ranasinghe, R.W.M.R.J.B. (author)
The well-known empirical relationship between the equilibrium cross-sectional area of tidal inlet entrances (A) and the tidal prism (P), first developed by O’Brien (1931), has been extensively reviewed. Our theoretical investigations indicate that a unique A-P relationship should only be expected for clusters of inlets that are phenomenological...
conference paper 2010
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