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Title: Modeling assessment of storm surge in the Salish Sea

Journal Article · · Estuarine Coastal and Shelf Science
ORCiD logo [1];  [2];  [2];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of Washington, Seattle, WA (United States)

Here we present a modeling assessment of storm surge in the Salish Sea—a large and complex estuarine system in the Pacific Northwest that is exposed to extratropical cyclones. A method was developed to systematically identify storm surge events in the Salish Sea based on water level records at four representative tidal gauges in the Salish Sea. The maximum storm surge distribution in the Salish Sea was calculated based on model simulations of 34 major historical storm events from 1980 to 2016. The model simulations were validated by field observations of water level and velocity using a suite of model performance metrics. Model results suggest that the maximum storm surge in the Salish Sea is generally in the range of 0.8 m–1.03 m and is heterogeneous in space. The model results also show a strong north-south gradient with larger surge magnitudes occurring in the north that is primarily caused by the southerly wind in winter months. The sensitivity analysis of wind forcing suggested that storm surge in the Salish Sea is dominated by the remote surge from the Pacific Ocean, and the local wind contributes up to approximately 20% of the surge variability. This paper systematically elucidates storm surge characteristics and potential risk in the Salish Sea.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
NOAA; USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1737821
Report Number(s):
PNNL-SA--150224
Journal Information:
Estuarine Coastal and Shelf Science, Journal Name: Estuarine Coastal and Shelf Science Vol. 238; ISSN 0272-7714
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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