COMPARING RESPONSE-BASED AND EVENT-BASED OVERTOPPING DESIGN

Coastal structure crest elevations are routinely designed to a specific hazard level. In the U.S., for example, levee often correspond 1 percent annual exceedance probability (AEP) overtopping rate at 90 confidence level (CL). Statistical methods compute coastal response range from simply inputting wave and water forcing conditions certain AEP into equation (i.e. event-based or frequency-based approach) fully stochastic Monte Carlo numerical simulation where thousands of storm responses sampled epistemic uncertainties incorporated response-based approach). Event-based approaches oversimplify both statistics physics; however, time, cost, complexity can limit application simulation. Response-based tend more realistically characterize responses. Herein we compare common floodwall design. For approaches, computed using forcings given AEP, large number storms in