Features
ADCIRC Overview
ADCIRC is an evolving framework to compute flow and transport in coastal oceans, shelves, estuaries, inlets, floodplains, rivers and beaches.
ADCIRC solves:
ADCIRC solves:
- 2D shallow water equations (SWE)
- 3D mass and momentum conservation subject to incompressibility, hydrostatic and Boussinesq approximations
- 2D sediment continuity equation
- 2D and 3D temperature and salinity transport equations
• ADCIRC accommodates the following forcing functions:
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- Gravity
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- Tidal potential
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- Earth load/self attraction tide
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- Wind and atmospheric pressure
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- Elevation, flow and radiation boundary conditions
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- Dynamic coupling with wave and sediment models
Other Features of ADCIRC include:
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- Use of cartesian or spherical coordinates
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- 2DDI and 3D modes
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- Full wetting/drying elements (2D and 3D)
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- Barrier elements (e.g. levees)
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- Conduits and porous barriers
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- Harmonic analysis (“on the fly”)
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- Cold or hot starts
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- Well Documented, Web Served, HTML Users Manual
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- Model design criteria
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- Large domain – localized resolution strategy to simplify often very difficult boundary condition specification
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- Algorithmic design criteria
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- Very low numerical damping model allows model parameters to be based on physically relevant values
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- Consistent with the governing equations
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- At least second order accurate
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- Robust
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Algorithms
ADCIRC has evolved into a multi-algorithmic code using both the traditional Continuous Galerkin (CG) based algorithms and the new Discontinuous Galerkin (DG) based algorithms
Continuous Galerkin (CG) Solutions
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- Our implementation is based on the Generalized Wave Continuity Equation (GWCE)
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- Gives smooth noise free physically damped solutions
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- Requires a locally defined weighting parameter G to operate correctly
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- Is functionally identical to TELEMAC’s Quasi-Bubble (QB) formulation and performs very similarly when G is defined correctly
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- Conserves mass globally
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- Does not conserve mass elementally but does so in the limit as the grid is refined
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- Elemental mass conservation can be applied as a grid resolution indicator
Discontinuous Galerkin (DG) Solutions
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- Gives smooth noise free physically damped solutions
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- In the lowest order implementation, DG is very similar to Finite Volume methods
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- Conserves mass globally
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- Conserves mass elementally
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- Offers an optimal treatment for advection dominated flow for SWE and transport equations
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- Grid refinement can be non-conforming
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- Solutions can be readily coupled to all transport models
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- DG SWE solutions are very similar to CG GWCE SWE solutions
