Sediment motion along normal sand beach: a. A sloping 

 sand beach oriented at an angle of 20° with the approach- 

 ing waves; b. the same beach after modified by the wave 

 action; and c. the stabilizing of the upper part of the 

 beach with the lower end, which corresponds to the sub- 

 merged beach at the foot of the cliff (Fig. 2), left open 

 for further wave action. 



FIGURE 4 

 27 



