An integrated high resolution tide and storm surge model has been developed for all of coastal Alaska. The model uses the ADCIRC basin-to-channel scale unstructured grid circulation code. Tidal forcing from global tidal models and meteorological forcing from the Climate Forecast System Reanalysis are used. The model’s tidal solution has been validated at 121 shelf and nearshore stations. The model’s skill has been investigated for summer, fall and winter storms. Sea ice has been incorporated through a parameterized wind drag coefficient which modifies the air-sea drag under ice coverage. Three large storms with distinctly different ice coverages were chosen to exhibit the effect of sea ice on the resulting storm surge. The root mean square error does not exceed 20 cm at any station. Forming coastal ice coverage increases coastal water levels, but the peaks are under predicted at the validation stations. Under dense pack ice, an increase in momentum transfer in the marginal sea ice at the shelf break leads to increased coastal water levels despite the decreased wind stress across the shelf pack ice. In highly variable ice fields, results are mixed, as the underlying assumptions about ice movement used to derive the drag parameterization may fail. To improve model performance for coastal water levels, it would be desirable to include the contribution of wave radiation stresses induced in marginal ice zones. Furthermore, including sea ice drift and current speeds explicitly in the air-sea-ice drag formulation would improve the description of momentum transferred to the water column.
|1e10bdbb-10e4-4e88-afea-906cb63c351a||Model mesh and bathymetry specification||mdJSON||ISO 19115-2||HTML|
|1e10bdbb-10e4-4e88-afea-906cb63c351a||A High-Resolution Coupled Tide and Storm Surge Model for the Gulf of Alaska, Bering Sea, Chuckchi Sea, and Beaufort Sea||mdJSON||ISO 19115-2||HTML|
|1e10bdbb-10e4-4e88-afea-906cb63c351a||Bathymetry over model domain||mdJSON||ISO 19115-2||HTML|
|1e10bdbb-10e4-4e88-afea-906cb63c351a||Tidal Coefficients -- best current working set||mdJSON||ISO 19115-2||HTML|
|1e10bdbb-10e4-4e88-afea-906cb63c351a||Large Scale Wave, Tide, and Surge Modeling in Sometimes Icy Waters||mdJSON||ISO 19115-2||HTML|
|1e10bdbb-10e4-4e88-afea-906cb63c351a||Westhuysen Webinar - A high-resolution, integrally-coupled ice, tide, wind-wave, and storm surge model for western Alaska||mdJSON||ISO 19115-2||HTML|