COHSTREX 2005 Modeling and Simulation

Our modeling work has proceeded on three fronts. First, we are working to acquire the bathymetry for the estuary and river system at sufficient resolution to allow generation of grids for the modeling, discussed in more detail below. Second, we have been analyzing the tidal forcing preparatory to creating the form for and location of boundary conditions for the simulations. Third, we have created and begun to execute a plan for migrating the sediment transport technology of Zedler and Street [2001] to SUNTANS so that we can simulate both suspended and bedload transports which can provide tracers [i.e., turbidity] in the coherent structures.

We have generated grids of the Snohomish River and Puget Sound using the GAMBIT grid generation package, as depicted in Figures 11 and 12. The boundaries of these grids were generated in ArcGIS 9, based on navigation charts from NOAA, bathymetry data from Finlayson et al. [2000], and a multi-channel Puget Sound tide model by Lavelle et al. [1988]. We plan to force the boundaries at locations 1 and 2 in Figure 11 with the tides to determine the tidal currents along the red line. These currents will then drive the western boundary of the finer grid in Figure 12, which will contain resolutions of roughly 1 meter in the study cite near Jetty Island and will use bathymetry from the REMUS bathymetric surveys.

Figure 11. Unstructured grid of the Snohomish River and Puget Sound, showing the boundary between the finescale grid and the coarse grid (red line), and the two open boundaries at 1 and 2, where we plan to force SUNTANS with the tides.

Figure 12. Refined unstructured grid of the Snohomish River which focuses on the study site of interest in the vicinity of Jetty island. The western boundary of this domain will be forced with the currents from a coarser-scale simulation using the grid shown in Figure 11.

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