° : CE 

 ■ : CRIEPI 



Wave Period (sec) 



Figure 19. Ratio of depth-to-trough bottom and depth-to-bar 

 crest h^^/h;, as a function of wave period 



accretionary profile was normally small, and its size decreased with increas- 

 ing grain size, making the bar flatter with a smaller value of ^t/^c ■ 



Maximum bar height 



254. As a bar moved offshore, its maximum height defined with respect 

 to the initial profile increased to approach an equilibrium value. Figure 

 20(a and b) shows maximum bar height Zg as a function of time for the CE and 

 CRIEPI experiments. Bars formed on an accretionary profile achieved equi- 

 librium height very rapidly, often during the first hour of the run (see Cases 

 101, 801, 2-3, 3-3). A coarser grain size produced a smaller equilibrium bar 

 height for the same wave parameters, and a larger wave height produced a 

 larger equilibrium bar height for fixed wave period and initial profile slope. 

 The curves displayed in Figure 20(a and b) are readily approximated by an 

 expression similar in form to Equation 7. (Some cases where a bar formed on 

 an accretionary profile showed an almost constant bar height in time and thus 

 were not used in the analysis.) Maximum bar height for all cases was esti- 



90 



