ROCK-ASPHALT MAT 



Rock-Asphalt Mot 

 SECTION 



Rock-asphalt mat revetment, Michiana, 

 Mich. (Lake Michigan). 



Prototype Installation : 



Michiana, Lake Michigan, Michigan. 



Upper beach rock-asphalt mat revetment (Brater, Armstrong and McGill, 



1974). 



Wave Tank Tests : 



Unknown , 



Design Factors : 



Zero-damage wave height: 2 to 4 feet (estimated). 



Wave runup: 0.8 to 1 compared to smooth slope (estimated). 



Wave reflection: High (estimated). 



Remarks : 



One layer of small rock (less than 1-foot diameter) covered with 

 asphalt to form a mat. 



Any revetment design should consider a gravel filter with gravel 

 or rock weep holes for pressure relief. 



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