Runup depends on structure shape and roughness, water depth at structure 

 toe, bottom slope in front of a structure, and incident wave characteris- 

 tics. Because of the large number of variables involved, a complete de- 

 scription is not available of the runup phenomenon in terms of all possi- 

 ble ranges of the geometric variables and wave conditions. Numerous lab- 

 oratory investigations have been conducted, but mostly for runup on smooth, 

 impermeable slopes. Hall and Watts (1953) investigated runup of solitary 

 waves on impermeable slopes; Saville (1956) investigated runup by periodic 

 waves. Dai and Kamel (1969) investigated the runup and rundown of waves 

 on rubble breakwaters. Savage (1958) studied effects of structure rough- 

 ness and slope permeability. Miller (1968) investigated runup of undular 

 and fully broken waves on three beaches of different roughnesses. 

 LeM^haut^ (1963) and Freeman and LeM^haut^ (1964) studied long-period 

 wave runup analytically. Keller, et al. (1960), Ho and Meyer (1962), and 

 Shen and Meyer (1963) studied the motion of a fully broken wave and its 

 runup on a sloping beach. 



Figures 7-8 through 7-13 summarize results for small-scale laboratory 

 tgsts of wave runup on smooth impermeable slopes. (Saville, 1958a.) The 

 curves are in dimensionless form for the relative runup R/H^ as a func- 

 tion of deepwater wave steepness and structure slope, where R is the 

 runup height measured (vertically) from the SWL and H'q is the unrefracted 

 deepwater wave height. (See Figure 7-7 for definitions.) Results pre- 

 dicted by Figures 7-8 through 7-12 are probably less than the runup on 

 prototype structures because of a scale effect due to the inability to 

 scale roughness effects in small-scale laboratory tests. Runup values 

 from Figure 7-8 through 7-12 aan be adjusted for scale effects by using 

 Figure 7-23. 



-Point of maximum wave runup 



Figure 7-7. Definition Sketch, Wave Runup and Overtopping 



7-17 



