Table 3. Wave runup pre 



diction coe 



fficients using the Ahrens 



and McCartney (1975) method 



Armor 

 unit 



■No. of 

 layers 



1 

 Permeability 



2 2 



a b 



d 

 Crange) 



H 

 (range) 



Cot e 



(range) 



Source 



Rubble 



Rubble 

 Rubble 

 Dolos 



2 







2 



I 

 P 



I 



0.956 



0.692 

 0.775 

 0.9o8 



0.398 



0.504 

 0.361 

 0.703 



0.0036 to 0.059 



0.0088 to 0.08 



5 



0.0004 to 0.013 

 0.0004 to 0.02 



2.5 to 5.0 



1.25 to 5.0 

 2.5 

 2.0 



/vhrens a-nd McCartney 

 (1975)3 

 (large-scale tests) 



Hudson (1958)'' 



Gunbak (19 79)^ 



Bottin, Chatham, and 

 Carver (1976) 



0.009 to 0.002 



0.0002 to 0.006 



Ip = permeable; I = impermeable. 

 2r/H - aC/(l+bt); e = tan e/AUl^. 

 ^Revised a and b. 



"^Means of observations. 

 ^Conditions unknown. 

 ^1.2 < e < 4.8. 



-1 i 1 1 1 1 1 1 1 \ 1 — ^T 1 1 r 



Riprop ( Ahrens and McCartney, 1975) ___^ — ' 



Rubble-Mound Breakwoter 

 (Gunbgk, 19791 



9.0 



-/h/Lc 



Figure 12. Wave runup prediction for rough structures using 

 the Ahrens and McCartney (1975) method. 



28 



