Numerical Modeling of Storm Surges in Chesapeake Bay
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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This paper presents the methodology, procedures, and results of numerically modeled high-water levels from 86 historical tropical and extratropical storms throughout Chesapeake Bay. The study is a part of the effort of life-cycle storm flooding analyses to compute mean frequency relationships with standard deviation error estimates. A regional scale hydrodynamic model ADCIRC is used to calculate water levels under high surface winds and low atmospheric pressure associated with the passage of storms. For tropical storms, surface wind and pressure fields were generated with the Planetary Boundary Layer PBL model, and storm tracks were from the North Atlantic tropical storm track list. For extratropical storms, wind fields were extracted from the long-term wind hindcast database by the Meteorological Service of Canada and the reanalysis project database by the U.S. National Centers for Environmental Prediction NCEP and the National Center for Atmospheric Research NCAR. The pressure fields were obtained from the NCEPNCAR database. Model results show a good agreement with measured wind and water levels. A key to the successful modeling was representation of the topography of river tributaries, which flooded during the storm to contain large water storage at peak surge.
- Physical and Dynamic Oceanography
- Numerical Mathematics