A fully coupled 3D wave‐current interaction model on unstructured grids

Roland, Aron; Zhang, Yinglong J.; Wang, Harry V.; Meng, Yanqiu; Teng, Yi-Cheng; Maderich, Vladіmir; Brovchenko, Igor; Sikirić, Mathieu Dutour; Zanke, Ulrich

doi:10.1029/2012jc007952

Cited by 155 publications

(150 citation statements)

References 86 publications

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“…In contrast, the desorption rate a ds in (34) does not affect the exchange between the water column and the sediment layer. This is not so for a very thin layer and for strong turbulence in the water or for a small distribution coefficient (see (32)). The desorption rate a ds in the one-layer model is important for the redistribution of activity between different fractions of sediment regulated by parameter a rs .…”

Section: One-layer Model Of Bed Sediment Contaminationmentioning

confidence: 99%

“…The detailed description of the model and methods for the numerical solution of the model equations using an unstructured grid and the finite element method can be found in [32,46].…”

Section: Hydrodynamics Modelmentioning

confidence: 99%

“…The sediment and radionuclide transport models are embedded in the circulation modelling system SELFE/SCHISM [32,45,46] in which the Reynolds-averaged Navier-Stokes equations in the hydrostatic and Boussinesq approximations were closed using the generic length-scale turbulence model [40]. The detailed description of the model and methods for the numerical solution of the model equations using an unstructured grid and the finite element method can be found in [32,46].…”

Section: Hydrodynamics Modelmentioning

confidence: 99%

“…7). The simulations were conducted using a hydrodynamics model [32] coupled with sediment and radioactivity transport models. The k À kl model of turbulence was used.…”

Section: Radionuclide Transport In a Channel With Bottom Depressionmentioning

confidence: 99%

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Migration of radioactivity in multi-fraction sediments

et al. 2017

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A new 3D radioactivity transport model coupled with multiscale circulation and multi-fractional sediment transport modules is presented. The sediment transport module simulates the transport of a mixture of one cohesive sediment fraction and a number of fractions of non-cohesive sediments of different sizes and densities. The model of radionuclide transport describes the key transport and exchange processes in the system of water-suspended and bottom multi-fraction sediments. Two-step kinetics with two successive reversible fast and slow reactions is used in the model. A noticeable feature of the model is approximation of the sediment and contamination profiles in the bed by multiple well-mixed layers to describe the vertical migration of radioactivity within bottom sediments due to erosion/deposition, molecular diffusion and bioturbation. The model accurately reproduced a laboratory experiment on the uptake of radiocesium by lake sediments. An analytical solution describing mutual adjustment of the concentrations of radioactivity in the pore water and in the multi-fraction sediment showed that activity was redistributed between different fractions of sediments far slower than between water and the total concentration in the sediment. The extended one-layer model of bottom contamination of multi-fraction sediments was derived from a general model and compared with a multilayer model. It was found, however, that the one-layer approximation was not capable of correctly predicting the inventory due to the fact that one-layer averaged concentration can essentially differ from the near-surface value in the multi-layer model. Radionuclide 123Environ Fluid Mech (2017) 17:1207-1231 DOI 10.1007 transport in channel with bottom depression was simulated to estimate the effects of erosion/deposition and the multi-fractionality of sediments on the transport process. It was shown that these factors affect the distribution of sediments by forming local maxima and minima of activity at the beginning and end of the depression, respectively, due to the redistribution of contaminated bottom sediments by flow. The developed model can also be used to simulate the transport of a wide class of toxic substances sorbed on sediments.

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Section: One-layer Model Of Bed Sediment Contaminationmentioning

confidence: 99%

“…The detailed description of the model and methods for the numerical solution of the model equations using an unstructured grid and the finite element method can be found in [32,46].…”

Section: Hydrodynamics Modelmentioning

confidence: 99%

Section: Hydrodynamics Modelmentioning

confidence: 99%

“…7). The simulations were conducted using a hydrodynamics model [32] coupled with sediment and radioactivity transport models. The k À kl model of turbulence was used.…”

Section: Radionuclide Transport In a Channel With Bottom Depressionmentioning

confidence: 99%

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Migration of radioactivity in multi-fraction sediments

et al. 2017

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“…The numerical tide-surge-wave modeling system used in the present study consists of a hydrodynamic model (Semi-implicit Eulerian-Lagrangian Finite-Element model, SELFE [24]) and a third-generation spectral wind wave model (Wind Wave Model II, WWM-II [25]). The same computational domain and unstructured-grid system are shared in the coupled model SELFE-WWM-II [26], which avoids the need for data interpolation between the two models and ensures parallel efficiency. SELFE computes the depth-averaged current and water surface elevation passed to WWM-II, while WWM-II passes the radiation stress to SELFE by solving the wave action equation.…”

Section: Methodsmentioning

confidence: 99%

Simulation of Typhoon-Induced Storm Tides and Wind Waves for the Northeastern Coast of Taiwan Using a Tide–Surge–Wave Coupled Model

Chen

Lin

Jang

et al. 2017

Water

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Abstract:The storm tide is a combination of the astronomical tide and storm surge, which is the actual sea water level leading to flooding in low-lying coastal areas. A full coupled modeling system (Semi-implicit Eulerian-Lagrangian Finite-Element model coupled with Wind Wave Model II, SELFE-WWM-II) for simulating the interaction of tide, surge and waves based on an unstructured grid is applied to simulate the storm tide and wind waves for the northeastern coast of Taiwan. The coupled model was driven by the astronomical tide and consisted of main eight tidal constituents and the meteorological forcings (air pressure and wind stress) of typhoons. SELFE computes the depth-averaged current and water surface elevation passed to WWM-II, while WWM-II passes the radiation stress to SELFE by solving the wave action equation. Hindcasts of wind waves and storm tides for five typhoon events were developed to validate the coupled model. The detailed comparisons generally show good agreement between the simulations and measurements. The contributions of surge induced by wave and meteorological forcings to the storm tide were investigated for Typhoon Soudelor (2015) at three tide gauge stations. The results reveal that the surge contributed by wave radiation stress was 0.55 m at Suao Port due to the giant offshore wind wave (exceeding 16.0 m) caused by Typhoon Soudelor (2015) and the steep sea-bottom slope. The air pressure resulted in a 0.6 m surge at Hualien Port because of an inverted barometer effect. The wind stress effect was only slightly significant at Keelung Port, contributing 0.22 m to the storm tide. We conclude that wind waves should not be neglected when modeling typhoon-induced storm tides, especially in regions with steep sea-bottom slopes. In addition, accurate tidal and meteorological forces are also required for storm tide modeling.

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Extreme sea levels on the rise along Europe's coasts

et al. 2017

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Future extreme sea levels (ESLs) and flood risk along European coasts will be strongly impacted by global warming. Yet, comprehensive projections of ESL that include mean sea level (MSL), tides, waves, and storm surges do not exist. Here, we show changes in all components of ESLs until 2100 in view of climate change. We find that by the end of this century, the 100-year ESL along Europe's coastlines is on average projected to increase by 57 cm for Representative Concentration Pathways (RCP)4.5 and 81 cm for RCP8.5. The North Sea region is projected to face the highest increase in ESLs, amounting to nearly 1 m under RCP8.5 by 2100, followed by the Baltic Sea and Atlantic coasts of the UK and Ireland. Relative sea level rise (RSLR) is shown to be the main driver of the projected rise in ESL, with increasing dominance toward the end of the century and for the high-concentration pathway. Changes in storm surges and waves enhance the effects of RSLR along the majority of northern European coasts, locally with contributions up to 40%. In southern Europe, episodic extreme events tend to stay stable, except along the Portuguese coast and the Gulf of Cadiz where reductions in surge and wave extremes offset RSLR by 20-30%. By the end of this century, 5 million Europeans currently under threat of a 100-year ESL could be annually at risk from coastal flooding under high-end warming. The presented dataset is available through this link: http://data.jrc.ec.europa.eu/collection/LISCOAST. Plain Language SummaryFuture extreme sea levels and flood risk along European coasts will be strongly impacted by global warming. Here, we show changes in all acting components, i.e., sea level rise, tides, waves, and storm surges, until 2100 in view of climate change. We find that by the end of this century the 100-year event along Europe will on average increase between 57 and 81 cm. The North Sea region is projected to face the highest increase, amounting to nearly 1 m under a high emission scenario by 2100, followed by the Baltic Sea and Atlantic coasts of the UK and Ireland. Sea level rise is the main driver of the changes, but intensified climate extremes along most of northern Europe can have significant local effects. Little changes in climate extremes are shown along southern Europe, with the exception of a projected decrease along the Portuguese coast and the Gulf of Cadiz, offseting sea level rise by 20-30%. By the end of this century, 5 million Europeans currently under threat of a 100-year coastal flood event could be annually at risk from coastal flooding under high-end warming.

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A fully coupled 3D wave‐current interaction model on unstructured grids

Cited by 155 publications

References 86 publications

Migration of radioactivity in multi-fraction sediments

Migration of radioactivity in multi-fraction sediments

Simulation of Typhoon-Induced Storm Tides and Wind Waves for the Northeastern Coast of Taiwan Using a Tide–Surge–Wave Coupled Model

Extreme sea levels on the rise along Europe's coasts

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