Elapsed Time (hr) 



Figure 64. Effect of k on bar volume 



shapes. However, these solutions did not fulfill the Dean criterion of equal 

 energy dissipation per unit volume for equilibrium conditions to prevail on a 

 beach. If the slope -dependent term in the transport equation (Equation 33) is 

 dropped, it is possible to solve the coupled problem of requiring constant 

 energy dissipation per unit volume subject to the Dally breaker decay model. 

 The coupled system of equations consists of Equations 26 and 33, for which the 

 slope term is neglected and D is set equal to Dg„ according to 



1^ = D 

 h dx ^'i 



(43) 



^ = ^ (F 

 dx h ^ 



Fs) 



(44) 



Note that here the x-axis originates from the shoreline, making Equation 44 

 differ in sign from Equation 26. 



187 



