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Puget Sound Georgia Basin Model

Hydrodynamic Framework

The Salish Sea model (SSM) covering the Puget Sound and Georgia Basins was developed using the Finite Volume Coastal Ocean Model (FVCOM) framework (an open source code released by UMASSD-WHOI; Chen et al., 2003). The hydrodynamic component of SSM provides year-long simulations of water-surface elevations, currents, salinity, and temperature, driven by hourly tides, daily freshwater inflows, and meteorological forcing. Tides propagate into the domain from the west through the Strait of Juan De Fuca, and move north into Georgia Strait past San Juan Islands and into Puget Sound through Admiralty Inlet. More information about river inflows and meteorological inputs to the model is provided under individual tabs. Examples of simulated water-surface salinity and temperature are shown in the panels to the right. The temperature and salinity results presented are a 7-day running average advanced at a rate of 6 hours per frame over 10 days in March 2006.

Enlarge image Click on the images below to enlarge.

SSM – model grid (intermediate scale, PS2.0).

For efficient year-long simulations, we have developed an intermediate-scale version of the entire domain with grid size varying from 350 m in estuaries and bays to as large as 3000 m in open coastal waters. It uses an unstructured grid with triangular elements and is well suited to accommodate complex shoreline geometry, waterways, and islands within this domain.

Surface salinity – SSM

Surface temperature – SSM.

This scale allows sufficient resolution of the various major river estuaries and sub-basins while allowing year-long simulations within 18 hours of run time on a multiprocessor cluster computer (see Khangaonkar et al. 2011; Yang et al. 2010). A sigma-stretched coordinate system is used in the vertical plane with 10 terrain-following sigma layers with higher layer-density near the surface. A fine-scale version with cells sides as small as 10 m is also available (see Khangaonkar and Yang 2011; Yang and Khangaonkar 2010).

PSGB_Model Model

Hydrodynamics