

0.4- 









^ 











CVJ 











o 



o 





-^2.5 



f> 



et 

 a 2 





0.3- 



~^2-0 N. 







o 





--I -5 \ \ 







CO 



o 



0.2- 



1 1.0 >v \ 







-J 

 o 



CO 



0.1 -i 

 0.0- 



0.5 Nv 



t'= 









1 I 



l 



~i~~ 



ALONGSHORE DISTRNCE (x/a) 



Figure 26. Shoreline evolution in the vicinity of a sand- 

 discharging river mouth of finite width 



59. A nondimensional quantity describing shoreline change is defined 

 according to 



y >(x»,t') - r<*.t)eD 

 4q R a 



(58) 



The quantity used to normalize Equation 58 can be written by using Equation 10 

 to arrive at 



2aq, 



(59) 



This quantity can be interpreted as a ratio between sand discharge from the 

 river and the amplitude of the sand transport rate produced by the waves. The 

 solutions given by Equations 47, 49, 55, and 56 are also valid for the place- 

 ment of sand (beach nourishment) , provided the placement is made under the 

 same conditions. Solutions with an opposite sign consequently represent 



43 



