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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)General Dynamics Advanced Information Systems PO Box 134008 Ann Arbor, Ml 4811304008 PERFORMING ORGANIZATION REPORT NUMBER 200392-8-F SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Defense Advanced Research Projects Agency 3701 North Fairfax Drive Arlington, VA 22203 SPONSOR/MONITOR'S ACRONYM(S) DARPA SPONSORING/MONITORING AGENCY REPORT NUMBER DISTRIBUTION AVAILABILITY STATEMENTApproved for Public Release: Distribution Unlimited SUPPLEMENTARY NOTES ABSTRACTIn this study, approaches for calculating the hydrodynamics of breaking waves were examined and the impact of hydrodynamic model errors on the prediction of radar backscatter was assessed. Reynolds-averaged Navier-Stokes (RANS) computations of stationary hydrofoil-generated breaking waves were carried out, including the modeling of the breaking region. These results were compared to experimental data. A subset of these results was used as input to the Veridian scattering model (VSM) and the results were also compared to available data. The results were then used define the research needs in this area. SUBJECT TERMSBreaking waves, Reynolds-averaged modeling, Potential flow 16.