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A modeling study of storm surge in the Salish Sea

2018
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Artifact Description

The Pacific Northwest coasts are subject to the threat of coastal inundation as a result of storm surge. This snapshot presentation provides an overview of a modeling study of storm surge in the Salish Sea using a high resolution coastal hydrodynamic model. A series of historical storm surge events were identified based on non-tidal residual (NTR) water levels observed at Seattle tide gage. Model simulations corresponding to selected storm surge events were conducted. The Salish Sea storm surge model was validated with both observed tidal and NTR data at NOAA tide gauges in the Salish Sea. Sensitivity analysis on the effects of wind forcing and the open boundary conditions are investigated. Model results indicated that storm surge within Salish Sea is dominated by the open boundary conditions at the entrance of the Strait of Juan de Fuca and wind forcing plays a secondary role. Distributions of storm surge heights corresponding to the sub-basins of Salish Sea are analyzed. The result is a map showing coastal areas at higher risk of storm surge versus those that are less exposed. Note: this submission is for oral snapshot presentation.

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