68
3 Basics of Nonhydrostatic Modelling
Fig. 3.35 Exercise 9. Distributions of 3,000 Lagrangian floats at selected times of the simulation.
Lines are density contours
circulation between shallow and deeper portions of the ocean follows. The aim of
this exercise is to simulate this density-driven overturning circulation using the nonhydrostatic convection model in a domain of variable bathymetry.
3.17.2 Implementation of Bottom Friction on a Sloping Terrain
The stair-step nature of z-coordinate systems requires special treatment for the calculation of bed-shear stresses. This needs to include all wet u-velocity grid points
situated directly above the sea floor, but also those that sit directly above the corner
of a step. Figure 3.36 gives an example.
3.17.3 Task Description
We consider a vertical ocean slice of 1 km in length and variable bathymetry,
resolved by equidistant grid spacings of Δx = Δz = 5 m (Fig. 3.37). Lateral
3 Basics of Nonhydrostatic Modelling
Fig. 3.35 Exercise 9. Distributions of 3,000 Lagrangian floats at selected times of the simulation.
Lines are density contours
circulation between shallow and deeper portions of the ocean follows. The aim of
this exercise is to simulate this density-driven overturning circulation using the nonhydrostatic convection model in a domain of variable bathymetry.
3.17.2 Implementation of Bottom Friction on a Sloping Terrain
The stair-step nature of z-coordinate systems requires special treatment for the calculation of bed-shear stresses. This needs to include all wet u-velocity grid points
situated directly above the sea floor, but also those that sit directly above the corner
of a step. Figure 3.36 gives an example.
3.17.3 Task Description
We consider a vertical ocean slice of 1 km in length and variable bathymetry,
resolved by equidistant grid spacings of Δx = Δz = 5 m (Fig. 3.37). Lateral