slope. Saville developed often-used curves for R/H as a function of wave 

 steepness . 



75. Hunt (1959) empirically determined an equation for runup from 

 laboratory data as 



R 

 Ho 



= 2.3m 



'H - 

 . T 2 . 



-1/2 



(51) 



where R and H are in feet. Battjes (1975) nondimensionalized the 

 equation of Hunt to give runup as a function of the surf similarity parameter. 

 The resulting equation was 



R 



1.0£ o for 0.1 < £ < 2.3 (52) 



H 



where £ is the offshore surf similarity parameter. 



76. Ahrens and Titus (1985) found good agreement between Equation 52 

 and laboratory runup data collected by Saville (1956) and Savage (1958). The 

 ratio of R/H to £ was 0.967 for £ < 2.0 . 



77. Ahrens (1981) empirically determined relationships for runup with 

 irregular waves on smooth slopes based on data of van Oorschot and d'Angremond 

 (1969), Kamphuis and Mohamed (1978), and Ahrens (1979). Runup was measured on 

 structures ranging from 1/1 to 1/4. Ahrens found 



(53) 



(54) 



(55) 



R 2 



H s 



1.61£ 



R s 



H s 



1.25£ 



R 





H s 



0.84£ 



41 



