PREFACE 



This report describes a means of estimating wave runup on coastal 

 structures with rough surfaces, and is a companion report to CETA 78-2, 

 "Revised Wave Runup Curves for Smooth Slopes" (Stoa, 1978b) . The report 

 is based principally on analyses of laboratory experiments as discussed 

 in TP 78-2 (Stoa, 1978a) . The work was conducted under the structure- 

 sediment -hydraulic interaction part of the coastal engineering research 

 program of the U.S. Array Coastal Engineering Research Center (CERC) . 



The technical guidelines presented in this report expand on the 

 methodology for determining wave runup on rough slopes presented in the 

 Shore Protection Manual (SPM) (U.S. Army, Corps of Engineers, Coastal 

 Engineering Research Center, 1977) . This report presents design curves 

 for particular slope and wave conditions, and a procedure to estimate 

 rough-slope runup as a function of runup on a comparable smooth slope 

 for untested conditions. Smooth-slope runup curves are given in TP 78-2 

 and CETA 78-2 (Stoa, 1978a, 1978b) and should be reviewed for a more 

 complete understanding of wave runup. Monochromatic waves are used here 

 exclusively. Ahrens (1977) has presented a method for estimating irreg- 

 ular runup after monochromatic wave runup (considered to be from the 

 significant wave) has been determined. Sketches of structures in this 

 report are meant to illustrate principles of runup and laboratory tests; 

 they do not necessarily indicate proper design for field application. 



This report was prepared by Philip N. Stoa, Oceanographer, under the 

 general supervision of Robert A. Jachowski, Chief, Coastal Design 

 Criteria 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 



