64. The time evolution of the net cross-shore sand transport rate was 

 obtained by integrating the sand conservation equation between consecutive 

 profile surveys. Figures 16 and 17 illustrate typical features of the time 

 evolution of the transport rate distribution for an erosional profile 

 (Case 400) and an accretionary profile (Case 201). These distributions, 

 arising from shorter time intervals, exhibit more complex patterns than 

 distributions calculated from initial and final profiles, for which the 

 relative effect of transient transport processes is reduced. The positive- 

 peaked (Figure 16) and negative-peaked (Figure 17) transport rates in the 

 distributions for erosional and accretionary profiles, respectively, were 

 located somewhat shoreward of the break point. In cases having bar develop- 

 ment, the location of the peak offshore transport rate moved seaward together 

 with the break point. In berm development cases, the location of the peak 

 onshore transport rate was approximately stationary with time because the 

 break point moved very little. 



65. The magnitude of the transport rate distributions decreased rapidly 

 with time, as seen in Figures 16 and 17. The peak transport rate was an order 

 of magnitude smaller for the latest distribution as compared to the earliest 

 distribution. Properties of the net transport rate distributions are dis- 

 cussed by Larson and Kraus (1988b). 



36 



