CH3DCurvilinear Hydrodynamics in 3 Dimensions
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First, area was computed for the CH3D grid cell layer (grid cells are not uniform in size and shape, but the total area was 871.4 [km.sup.2]) in the attribute table, and then the hard bottom and CFI3D layers were unioned.
Salinity variables were extracted from hydrodynamic simulations of the Lower Rappahannock River, using the CH3D model, which is a 3-dimensional, finite-difference hydrodynamic model that uses a horizontal curvilinear grid and a vertical z-grid to calculate temporally varying water levels and 3-dimensional velocity, temperature, and salinity (Kim 2013).
Chesapeake Bay is a well-studied system, and salinity values from high-resolution hydrodynamic codes (CH3D) and percent cultch values from detailed seabed classifications were used in the OHSIM.