Application of TELEMAC-2D in a narrow estuarine tributary

Malcherek, Andreas

doi:10.1002/1099-1085(200009)14:13<2293::aid-hyp29>3.0.co;2-4

Cited by 17 publications

(6 citation statements)

References 4 publications

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“…As both models are fully non linear (see Hervouet, 2002, Malcherek, 2000, for details of TELEMAC, and Chen et al 2003 for details of FVCOM), and contain "wetting and drying" (see for example Chen et al (2008) and Karna et al (2011) for a detailed discussion of "wetting and drying" and references to algorithms for implement it), which occurs when the total water depth falls below 0.05m, then they contain all the necessary physics for generating higher harmonics of the tide in shallow water. As the physics of higher harmonic generation is given in Davies 1986, Filloux and Snyder 1979, Heaps 1978, Inoue and Garret 2007, LeProvost 1991, Walters and Werner 1991, it will not be discussed here.…”

Section: Hydrodynamic Equations and Model Formulationsmentioning

confidence: 99%

“…model namely TELEMAC (e.g. Hervouet, 2002, Jones and Davies 2005, Malcherek 2000, Nicolle and Karpytchev 2007, under identical conditions of boundary forcing and bottom topography. The form of the hydrodynamic equations and brief details of the models, with references to the literature for more extensive technical details is presented in the next section .…”

Section: Introductionmentioning

confidence: 99%

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A model study of tidal distributions in the Celtic and Irish Sea regions determined with finite volume and finite element models

2011

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An unstructured mesh tidal model of the west coast of Britain, covering the Celtic Sea and Irish Sea is used to compare tidal distributions computed with finite element (F.E.) and finite volume (F.V.) models. Both models cover an identical region, use the same mesh, and have topography and tidal boundary forcing from a finite difference model that can reproduce the tides in the region. By this means solutions from both models can be compared without any bias towards one model or another. Two dimensional calculations show that for a given friction coefficient there is more damping in the F.V. model than the F.E. model. As bottom friction coefficient is reduced the two models show comparable changes in tidal distributions. In terms of mesh resolution, calculations show that for the M2 tide the mesh is sufficiently fine to yield an accurate solution over the whole domain. However in terms of higher harmonics of the tide, in particular the M6 component, its small scale variability in near shore regions which is comparable to the mesh of the model, suggests that the mesh resolution is insufficient in the near coastal regions. Even with a finer mesh in these areas, without detailed bottom topography and a spatial varying friction depending on bed types and bed forms, which is not available, model skill would probably not be improved. In addition in the near shore region, as shown in the literature, the solution is sensitive to the form of the wetting/drying algorithm used in the model. Calculations with a three dimensional version of the F.V. model show that for a given value of k, damping is reduced compared to the two dimensional version due to the differences in bed stress formulation, with the three dimensional model yielding an accurate tidal distribution over the region. (1) Description of models slightly enhanced. As a detailed description is given in published papers, these are cited, as we do not wish to repeat information. In addition since a functional form of the solution is given over each finite element or finite volume this can be used to interpolate solutions (e.g. water elevations) to any location. This point made in text. (2) It is made clear that the staircase representation of the coastline only relates to a certain class of finite difference model. (3) The k-0.003 calculations are mentioned "early on". (4) Possibility of lack of mesh resolution influencing solution of higher harmonics is discussed in context of the fact that this could also be influenced by "wetting and drying". Additional references added. (5) Abstract rephrased to suggest this, rather than claim that it has been shown. Similar in text. (6) Elaborated to show that in the near short region the amplitude of the higher harmonics changes very rapidly from one mesh element to another. A sure sign of a lack of spatial convergence. The confusion between temporal convergence, where iteration ensures that a converged solution does occur and spatial convergence is now clarified. (7) The realistic nature of these coefficients is c...

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Section: Hydrodynamic Equations and Model Formulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model study of tidal distributions in the Celtic and Irish Sea regions determined with finite volume and finite element models

2011

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“…: LISBON-TYPE TSUNAMI IMPACT ON THE UK variable mesh was generated using the TELEMAC-2D hydrodynamic model [Galland et al, 1991;Hervouet, 2000a]. This model has been extensively validated for tides [Malcherek, 2000;Sauvaget et al, 2000;Jones and Davies, 2005] and wind-induced response [Jones and Davies, 2006] in shallow shelf seas. Its capacity to simulate runup well is aided by a wetting-drying scheme that performs well at the finest resolution [Jones and Davies, 2006].…”

Section: C04007mentioning

confidence: 99%

Impact of a Lisbon‐type tsunami on the U.K. coastline and the implications for tsunami propagation over broad continental shelves

et al. 2008

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[1] We investigate the propagation of tsunamis toward the European shelf break, using six different initial conditions (based on the 1755 Lisbon earthquake), in order to assess the hazard to this region. Only one of our source models, an assumed earthquake magnitude of 8.7 Mw with a zonal fault orientation, resulted in significant wave heights at the U.K. coastline. Because of wave spreading, only a fraction of the tsunami energy from such an event reaches the northwest European shelf, which itself provides a further buffer through reflection and frictional dissipation. However, we found significant local reamplification due to wave interactions and resonance on the continental shelf. The maximum elevations obtained were comparable to severe winter storm conditions, but with extreme local variability in the tsunami amplitude. Our results suggest that the impact of any repeat of this event would be very sensitive to the precise location and orientation of the source deformation, as well as by complex topographic interactions on the shelf. The uncertainties arising from the combination of source orientation and bathymetric interaction suggest that any assessment of risk, for places where tsunamis are likely, should consider a large ensemble of initial conditions.

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“…The TELEMAC code has been used very successfully in other shallow water regions (e.g. Malcherek 2000, Heniche et al 2000, Hervouet 2002, Fernandes et al 2002, 2004 and preliminary calculations (JD05) showed that it could reproduce the major features of the tide off the west coast of Britain without any tuning and using boundary forcing and topography taken from a previous uniform finite difference model. The finite element grid of this model is ideal for examining the effects of nearshore dynamics upon higher harmonics of the tide (Jones and Davies 2007a) for a number of reasons.…”

Section: Introductionmentioning

confidence: 99%

An inter-comparison of tidal solutions computed with a range of unstructured grid models of the Irish and Celtic Sea Regions

2009

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Application of TELEMAC-2D in a narrow estuarine tributary

Cited by 17 publications

References 4 publications

A model study of tidal distributions in the Celtic and Irish Sea regions determined with finite volume and finite element models

A model study of tidal distributions in the Celtic and Irish Sea regions determined with finite volume and finite element models

Impact of a Lisbon‐type tsunami on the U.K. coastline and the implications for tsunami propagation over broad continental shelves

An inter-comparison of tidal solutions computed with a range of unstructured grid models of the Irish and Celtic Sea Regions

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