PREFACE 



This report describes methods for predicting wave transmission coef- 

 ficients for permeable breakwaters using a transmission by overtopping 

 equation together with the analytical model of Madsen and '.Vhite (1976). 

 This technique has been tested with physical model results for nonbreak- 

 ing and some breaking waves, for monochromatic and irregular wave condi- 

 tions, and for riprap and some concrete armor unit breakwaters (Seelig, 

 in preparation, 1979) . The technique was found to give useful predic- 

 tions of transmission coefficients for design. The work was carried out 

 under the offshore breakwaters for shore stabilization program of the 

 U.S. Army Coastal Engineering Research Center (CERC) . 



This report was prepared by William N. Seelig, Hydraulic Engineer, 

 under the general supervision of Dr. R.M. Sorensen, Chief, Coastal 

 Processes and Structures Branch. 



Comments on this publication are invited. 



Approved for publication in accordance with Public Law 166, 79th 

 Congress, approved 31 July 1945, as supplemented by Public Law 172, 88th 

 Congress, approved 7 November 1963. 



TED E. BISHOP 



Colonel, Corps of Engineers 



Commander and Director 



