ABSTRACT
As can be seen from Figure 8-1, the intersection point of the profile with the still water level determines the position of the newly formed slope. From this point, an upper slope is drawn at 1:1.8 and a lower slope at 1:5.5. The horizontal distance lc determines the position of the crest on the upper slope, the distance ls determines a transition point on the lower slope. The actual slope in the zone of wave attack is a curved line through the three points. Below the lower transition point, a very steep slope develops at the angle of natural repose j. If the original slope was already steep, the steep lower slope continues until the bottom is reached. If the original slope was gentle, the steep part continues until a level ht below SWL. From the newly formed crest, the equilibrium profile connects to the original slope at a distance l
r (the run-up length). The position of the intersection point with SWL is not known in advance, but can be found easily when one realizes that the volume of erosion should be equal to the volume of accretion. An example of slope development based on the formulae is shown in Figure 8-2.
