0.25 







j -0.25 



' -0.50 



-0.75 



-1.00 



T*=0 



T*=45 



T*=90 



Cosine Slope 

 d2/d, = O.I5 

 T*=»(g/d,)'/2 



'0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 



d, 



Figure 27. Solitary wave propagating onto a shelf (from Street, Chan, 

 and Fromm, 1970) . 



0.25 r 



T*=0 T*=45 T*=90 





 -0.25 

 ■0.50 - 

 0.75 - 



-1.00 



■ ' I I *M I I I 



Cosine Slope 

 d 2 /d| =0.15 

 T* = t(g/d,)i/z 



J I I I L 



5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 



Figure 28. Wave train propagating onto a shelf (from Street, Chan, 

 and Fromm, 1970) . 



************** EXAMPLE PROBLEM 7************** 



GIVEN : A tsunami with a wave period of 15 minutes travels through water 

 3~7000 meters (9,840 feet) deep. 



FIND : If the wave is stable. 



SOLUTION : The wave celerity is given by 



C = *^gd = /9.807 x 3,000 = 171.5 meters (563 feet) per second 

 The wavelength is 



L ■ CT = 171.5 x 15 x 60 = 154,350 meters (95.9 miles) 



83 



