# PNWTOX numerical model - physics

### PNWTOX model domain

### The left panel shows the entire model domain with tick marks every 2 grid cells. The highest resolution is 1.5 km near the coastline extending out to 4.5 km offshore and 2 km within the Salish Sea leading to a horizontal grid of 174 x 381 grid cells. The right panel shows a cross sections of the vertical grid at 47N. There are 40 vertical levels with stretching parameters chosen to increase resolution both near the surface and in the bottom boundary layer.

## forcing

## model set-up

### a vast number of choices can be made when setting up a model configuration, a few of the important ones are listed here:

- boundary nudging has an incoming time scale of 0.75d and and outgoing timescale of 360d at the boundary and is increased towards infinity over 6 grid cells
- k- ε version of GLS turbulence closure
- horizontal diffusivity and viscosity set to 2.0 m
^{2}s^{-1}
- quadratic bottom friction (C
_{d} = 0.003) and no-slip
- bathymetry min = 4 m, no wetting/drying yet
- bathymetry smoothed using a volume preserving scheme that best preserves the original bathymetry (Sikiric 2011) resulting in: max Beckmann & Haidvogel # (rx
_{0}) ~0.15, max Haney # (rx_{1}) ~9