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Puget Sound Georgia Basin Model

Tides and T/S Boundary Conditions

The Salish Sea Model (SSM) features an expanded open ocean boundary sufficiently far from the estuary entrances at the Strait of Juan de Fuca and Strait of Georgia that extends west to the continental shelf. This has helped overcome the limitation of the early version of the model with ocean boundaries near the estuary entrances.

Tidal forcing at the open boundary is based on tidal constituents (S2, M2, N2, K2, K1, P1, O1, Q1, M4, and M6) derived from the ENPAC model (Spargo et al., 2004).

Water-quality (T/S) monitoring stations from the Department of Fisheries and Oceans (DFO) over the continental shelf, along with SSM boundary. The quarterly monitoring data from DFO stations were interpolated in space and time to provide T and S ocean boundary conditions.

Temperature and salinity profiles along the open boundaries are currently specified based on quarterly observations conducted by Department of Fisheries and Oceans, Canada (DFO). Temperature and salinity profiles collected from various locations over the continental shelf are selected using a proximity polygon surrounding the Salish Sea Model ocean boundary.

Selected T and S profiles are then interpolated to the model ocean boundary in time and space, resulting in monthly OBC profiles (an example is shown below).

Example of SSM OBC salinity profiles at a representative boundary node in Year 2014, generated from DFO quarterly monitoring. Red dots are selected DFO data that are within the proximity polygon in and within the particular month.

Salish Sea Model Overview

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