Contour interval in meters; 



heavier numerals are water 



heights in centimeters 



Figure 52. Tsunami runup at Ryoisi, Japan (after Nasu, 1934). 



height is sometimes less than that value. To analyze the runup of 

 breaking waves and fully developed bores, where maximum runup heights 

 have been observed to be much higher than the wave or bore height at 

 the shoreline, it is necessary to consider the actual form of the runup. 



Using solitary waves, Camfield and Street's (1967) experimental 

 results for an 8° nearshore slope fronted by a slope S 2 = 0.01 indicated 

 that the runup takes the initial form of a horizontal water surface at 

 an elevation equal to the wave height at the shoreline (Fig. 53), and 

 that the higher runup on the slope washes up the slope at a shallow depth. 

 Results for plunging breakers on 4° and 8° slopes fronted by a slope 

 S 2 = 0.01, and on 4°, 8°, and 12° slopes fronted by a slope S 2 = 0.03, 

 indicated similar runup characteristics. The higher, shallow runup may 

 cause some flooding, but would not be expected to otherwise cause damage 



152 



