Elapsed Time (hr) 



Figure 63. Effect of e on bar volume 



€ by a factor of four gave a corresponding change in the equilibrium maximum 

 bar height of less than 10 percent. Similarly, the location of the bar mass 

 center was found to have a weak dependence on changes in e . 

 Influence of wave model parameters 



448. Parameter values in the breaker decay model were specified in the 

 calibration procedure as suggested by Dally (1980). To quantify the impor- 

 tance of variations in the wave height calculation, the wave decay coefficient 

 K in Equation 26 was varied. Figure 64 illustrates the growth of bar volume 

 as a function of time for various values of /c . A smaller value of k 

 implied a larger equilibrium bar volume, although the time responses were 

 similar at the very beginning of a simulation. As theoretical background it 

 proves valuable to digress and examine the shape of the equilibrium beach 

 profile exposed to a wave height distribution which fulfills the breaker decay 

 model developed by Dally (1980). 



449. Dally, Dean, and Dalrymple (1985a, b) presented analytical solu- 

 tions for the cross-shore distribution of wave height for simple beach profile 



186 



