a> 



£ 20 



o 



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03 



DO .„ 



Elapsed Time (hr) 



Figure 7. Growth of bar volume through time 



Maximum bar height 



52. Maximum bar height Zg on a given profile was defined as the 

 maximum difference in elevation within the domain of the bar between the 

 profile and the initial profile (see Figure 5). The location of Z B along 

 the profile did not necessarily coincide with the location of the bar crest, 

 the point on the bar where water depth is a minimum; however, Z B was always 

 close in value to the bar crest height. Figure 8 illustrates the growth of 

 Z B with elapsed time for the 13 cases. The time evolution of maximum bar 

 height was similar to evolution of bar volume. However, equilibrium was 

 achieved more rapidly for maximum bar height since most of the curves in 

 Figure 8 are relatively horizontal toward the end of the run. 



53. Comparison between Cases 901 and 911 shows the influence of water 

 level variation on maximum bar height. In Case 911 (variable water level), 

 the trend of the maximum bar height is to increase with time toward an equi- 

 librium value but with a superimposed fluctuation that is approximately in 

 phase with the water level variation. The corresponding Case 901, with a 

 fixed water level, shows a regular development of maximum bar height toward an 

 equilibrium value of approximately 1 m. 



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