y(x,t) ■- o -iJ 



■y¥^ 



-x /4et 



- x erfc 



2 /Ft 



n/f^/ 



c 2 2 U r 2 

 y% -x /4e£ 



cK 



(B12) 



4. The last term on the right side of Equation B12 describes a tran- 

 sient which disappears with time. After the effect of the transient term has 

 vanished, the solution for shoreline change downdrift of a groin will be the 

 same as the solution obtained without bypassing but with a modified breaking 



wave angle. If Q_ < 20 a erosion will take place; whereas if Q„ > 20 a 

 Boo X B o o 



there will be accretion. 



B3 



