Elapsed Time (hr) 



Figure 68. Effect of T on bar volume 



460. The effect of an increase in wave height on bar properties is 

 readily understood, since a larger wave height involves a larger amount of 

 wave energy for the beach profile to dissipate in a state of equilibrium. 

 Both equilibrium bar volume and equilibrium maximum bar height increased 

 significantly as wave height increased. 



Influence of runup height 



461. The location of the shoreward boundary in the model is closely 

 related to the runup height and can be predicted by an empirical relationship 

 (Equation 17). Since Equation 17 contains the slope of the beach, a difficult 

 parameter to quantify in a field application, it is of significance to 

 estimate the influence of runup height on the simulation result. Figure 69 

 illustrates growth of bar volume with time for various runup heights calcu- 

 lated through Equation 17. Evolution of bar volume was only slightly affected 

 by the considerable variation in runup height. Consequently, even a signi- 

 ficant error in estimation of the runup height will not notably degrade the 



192 



