Abstract
Empirical dispersion functions appear to reasonably predict damage risks for coastal roadways subjected to coastal storm surge and wave hazards. County Road 257 (CR 257) in Brazoria County, Texas had significant damage at various locations during Hurricane Ike in September 2008. Cumulative peak hourly water surface elevation, wave period, and current velocity output from a hindcast ADCIRC+SWAN model was assessed using modified celerity dispersion functions relative to measured distance between road and shoreline. These intensity measures provide a strongly correlated model for predicting likelihood of road damage.
Highlights
COASTAL MODELING DATA Coastal model includes Atlantic, Caribbean, and Gulf of Mexico basins and extends into back bays of Galveston and Chambers counties, as well as portions of Brazoria, Harris, and Jefferson counties
ROADWAY DAMAGE PREDICTIVE FUNCTIONS Empirical dispersion functions appear to reasonably predict damage risks for coastal roadways subjected to coastal storm surge and wave hazards
Cumulative functions were recognized to vary based on approximate distance from County Road 257 (CR 257) to shoreline measured at mean sea level from pre-event aerials
Summary
ROADWAY DAMAGE PREDICTIVE FUNCTIONS Empirical dispersion functions appear to reasonably predict damage risks for coastal roadways subjected to coastal storm surge and wave hazards. Cumulative peak hourly water surface elevation, wave period, and current velocity output from a hindcast ADCIRC+SWAN model was assessed using modified celerity dispersion functions relative to measured distance between road and shoreline. These intensity measures provide a strongly correlated model for predicting likelihood of road damage. Data sets included wind fields, currents, storm surge elevations, flooding depths, and wave characteristics. Horizontal setback distance from road to shoreline is strongly correlated to damage potential. Identifying strong correlation between cumulative celerity functions using peak IM variables is unique research
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