An Unstructured Grid, Finite-Volume Coastal Ocean Model (FVCOM) System

Chen, Changsheng; Beardsley, Roberet; Cowles, Geoffrey W.

doi:10.5670/oceanog.2006.92

Cited by 626 publications

(535 citation statements)

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“…[61] Equations (B1)-(B2) are solved using the modified fourth-order Runge-Kutta time-stepping scheme as in FVCOM [Chen et al, 2003[Chen et al, , 2006b]. This is a modified four-stage time-stepping method with second-order accuracy [Dick, 1994].…”

Section: Appendix B: Mode Split and Semi-implicit Time Stepping Algormentioning

confidence: 99%

“…[2] The unstructured grid finite volume coastal ocean model (FVCOM) is a state-of-the-art open source community model that has been applied to global/basin/regional scale ocean, coastal, and estuarine studies [Chen et al, 2003[Chen et al, , 2006a[Chen et al, , 2006b[Chen et al, , 2007. FVCOM was developed originally with the hydrostatic approximation in which the rate of change, advection, and diffusion of the vertical velocity are ignored and the pressure gradient in the vertical is balanced by gravity.…”

Section: Introductionmentioning

confidence: 99%

“…In a mode split model, an adjustment must be made at every internal time step to ensure consistency between the vertically integrated water transport produced by the external and internal modes [Mellor, 2004;Chen et al, 2006b]. For hydrostatic models, the internal velocities are adjusted to the external velocities at each time step to ensure the consistency of volume transport, since the velocities calculated by the external mode are generally more accurate than the vertically integrated velocities calculated from the internal mode.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the mathematical forms of the shortwave flux and horizontal diffusion terms are given in the FVCOM user manual [Chen et al, 2006b]. …”

Section: Formations and Discretization Procedures Of Fvcom-nhmentioning

confidence: 99%

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A nonhydrostatic version of FVCOM: 1. Validation experiments

et al. 2010

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[1] The unstructured grid finite volume coastal ocean model (FVCOM) system has been expanded to include nonhydrostatic dynamics. This addition uses the factional step method with both split mode explicit and semi-implicit schemes. The unstructured grid finite volume method, combined with a correction of the final free surface from its intermediate value with inclusion of nonhydrostatic effects, efficiently reduces numerical damping and thus ensures second-order accuracy of the solutions with local/global volume conservation. Numerical experiments have been made to fully validate the nonhydrostatic FVCOM, including surface standing and solitary waves in idealized flat-and slopingbottomed channels in homogeneous conditions, the density adjustment problem for lock exchange flow in a flat-bottomed channel, and two-layer internal solitary wave breaking on a sloping shelf. The model results agree well with the relevant analytical solutions and laboratory data. These validation experiments demonstrate that the nonhydrostatic FVCOM is capable of resolving complex nonhydrostatic dynamics in coastal and estuarine regions.

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Section: Appendix B: Mode Split and Semi-implicit Time Stepping Algormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the mathematical forms of the shortwave flux and horizontal diffusion terms are given in the FVCOM user manual [Chen et al, 2006b]. …”

Section: Formations and Discretization Procedures Of Fvcom-nhmentioning

confidence: 99%

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A nonhydrostatic version of FVCOM: 1. Validation experiments

et al. 2010

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“…FVCOM is the unstructured-grid Finite-Volume Community Ocean Model, which was originally developed by Chen et al [2003] and improved by the joint UMASSD and WHOI FVCOM development team [Chen et al, 2006;Chen et al, 2013a]. The governing equations are discretized in an integral form over control volumes in which the advection terms are solved by a second-order accuracy upwind finite-volume flux scheme [Kobayashi et al, 1999;Hubbard, 1999] with a time integration of either a mode-split solver or a semi-implicit solver.…”

Section: Necofsmentioning

confidence: 99%

Surface circulation in Block Island Sound and adjacent coastal and shelf regions: A FVCOM-CODAR comparison

Sun

Chen

Beardsley

et al. 2016

Progress in Oceanography

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CODAR-derived surface currents in Block Island Sound over the period of June 2000 throughSeptember 2008 were compared to currents computed using the Northeast Coastal Ocean Forecast System (NECOFS). The measurement uncertainty of CODAR-derived currents, estimated using statistics of a screened nine-year time series of hourly-averaged flow field, ranged from 3-7 cm/s in speed and 4°-14° in direction. The CODAR-derived and model-computed kinetic energy spectrum densities were in good agreement at subtidal frequencies, but the NECOFS-derived currents were larger by about 28% at semi-diurnal and diurnal tidal frequencies. The short-term (hourly to daily) current variability was dominated by the semidiurnal tides (predominantly the M 2 tide), which on average accounted for ~87% of the total kinetic energy. The diurnal tidal and subtidal variability accounted for ~4% and ~9% of the total kinetic energy, respectively. The monthly-averaged difference between the CODAR-derived and model-computed velocities over the study area was 6 cm/s or less in speed and 28° or less in direction over the study period. An EOF analysis for the low-frequency vertically-averaged model current field showed that the water transport in the Block Island Sound region was dominated by modes 1 and 2, which accounted for 89% and 7% of the total variance, respectively. Mode 1 represented a relatively stationary spatial and temporal flow pattern with a magnitude that varied with season. Mode 2 was characterized mainly by a secondary cross-shelf flow and a relatively strong along-shelf flow. Process-oriented model experiments indicated that the relatively stationary flow pattern found in mode 1 was a result of tidal rectification and its magnitude changed with seasonal stratification. Correlation analysis between the flow and wind stress suggested that the cross-shelf water transport and its 3 temporal variability in mode 2 were highly correlated to the surface wind forcing. The mode 2 derived onshore and offshore water transport, and was consistent with wind-driven Ekman theory.The along-shelf water transport over the outer shelf, where a large portion of the water flowed from upstream Nantucket Shoals, was not highly correlated to the surface wind stress.

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Coastal flooding in Scituate (MA): A FVCOM study of the 27 December 2010 nor'easter

Beardsley

Chen

2013

J. Geophys. Res. Oceans

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[1] A nested Finite-Volume Coastal Ocean Model (FVCOM) inundation forecast model has been developed for Scituate (MA) as part of the Northeast Coastal Ocean Forecast System (NECOFS). Scituate Harbor is a small coastal lagoon oriented north-south with a narrow entrance (with opposing breakwaters) opening eastward onto Massachusetts Bay and the Gulf of Maine. On 27 December 2010, a classic nor'easter produced a 0.9 m high surge, which when added to the 1.5 m high tide and seasonal higher mean water level, produced significant inundation in Scituate. The Scituate FVCOM inundation model includes flooding/drying, seawall/breakwater, and wave-current interaction capabilities, and was driven by one-way nesting with NECOFS. Hindcasts of the 27 December nor'easter event were made with two different resolution Scituate FVCOM grids with and without inclusion of wave-current interaction to examine the influence of spatial resolution and model dynamics on the predicted flooding. In all simulations, a wind-driven coastal current flowed southward across the harbor entrance, with an attached separation eddy forming downstream of the northern breakwater and rapid decrease in wave energy entering the harbor. With wave-current interaction, the southward coastal current was strongly enhanced and currents within the separation eddy increased to more than 1 m/s, making it highly nonlinear with large lateral shears. Comparisons of the model water elevation time series with harbor tide station measurements showed that inclusion of wave-current interaction increased the peak model surge by 8 cm, in closer agreement with the observed peak.

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An Unstructured Grid, Finite-Volume Coastal Ocean Model (FVCOM) System

Cited by 626 publications

References 1 publication

A nonhydrostatic version of FVCOM: 1. Validation experiments

A nonhydrostatic version of FVCOM: 1. Validation experiments

Surface circulation in Block Island Sound and adjacent coastal and shelf regions: A FVCOM-CODAR comparison

Coastal flooding in Scituate (MA): A FVCOM study of the 27 December 2010 nor'easter

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