GENESIS produced excellent agreement in preliminary calibration runs to simu- 

 late measured shoreline change behind six prototype detached breakwaters of 

 different tranmissivities. 



Future modeling plans call for further tests of GENESIS. The model will 

 then be used to develop general design criteria which will allow coastal 

 managers and engineers to make initial estimates of breakwater placement as a 

 function of environmental and design parameters. 



ACKNOWLEDGEMENTS 



We would like to thank Dr. S. A. Hsu, Louisiana State University, for 

 providing the wave and wind data. Ms. Lynn Louden, LGS , reduced and formatted 

 the Holly Beach survey data, and Mr. John Snead, Cartographic Section, LGS, 

 prepared the site location map. CERC colleagues Mr. Bruce Ebersole and Ms. 

 Julie Dean Rosati provided constructive comments on an early draft of this 

 paper, and Mr. Barry Sommerfeld assisted in production of the figures. 



The contribution of N. C. Kraus was made as part of the activities of the 

 Surf Zone Sediment Transport Processes work unit of the Shore Protection and 

 Evaluation Program, Coastal Engineering area of Civil Works and Development, 

 being executed by the Coastal Engineering Research Center, U.S. Army Engineer 

 Waterways Experiment Station. He appreciates permission granted by the Chief 

 of Engineers to publish this information. 



REFERENCES 



Dally, W. R. , and Pope, J. 1986. "Detached Breakwaters for Shore Protection," 

 Tech. Rep. CERC-86-1, U.S. Army Engr. Waterways Expt. Station, Coastal Engrg. 

 Res. Center, Vicksburg, Miss., 62 pp. 



Hanson, H. , 1987. "GENESIS -- A Generalized Shoreline Change Numerical Model 

 for Engineering Use," Report No. 1007, Dept of Water Resources Engrg., Univ. 

 of Lund, Sweden, 206 pp. 



Hanson, H. 1989. "Genesis -- A Generalized Shoreline Change Numerical Model," 

 J. of Coastal Res. . Vol 5, No. 1, pp 1-27. 



Hanson, H. , and Kraus, N. C. 1985. "Seawall Constraint in the Shoreline 

 Numerical Model," Journal of Waterway. Port. Coastal and Ocean Engineering . 

 Vol. Ill, No. 6, pp. 1079-1083. 



Hanson, H. , and Kraus, N. C. 1986a. "Forecast of Shoreline Change Behind 

 Multiple Coastal Structures," Coastal Engrg. Japan , Vol. 29, pp. 195-213. 



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