transport rate distribution is more pronounced than for Type E, related to the 

 small bar frequently present and located slightly shoreward of the break point 

 on accretionary profiles. The onshore-directed transport gives rise to a berm 

 on the foreshore . 



317. The third main type of equilibrium transport rate distribution, 

 Type AE, and typified by Case 3-2, is characterized by one peak with offshore - 

 directed transport occurring on the foreshore and another peak with onshore- 

 directed transport located seaward of the break point. Thus, the bar receives 

 contributions of material from both offshore- and onshore -directed transport. 

 The Type-AE equilibrium transport rate distribution is characteristic of bar 

 profiles which were closer to the dividing line between bar/berm profiles than 

 profiles associated with Type-E distributions. Figure 37 illustrates profile 

 evolution for CRIEPI Case 3-2, which is a typical example resulting from mixed 

 accretionary and erosional (Type AE) transport distributions. 



318. Of the 33 cases examined, 29 were easily classified as having Type 

 A, E, or AE equilibrium transport rate distributions (15 E-type, 10 A- type, 

 and 4 AE-type). In some cases, particularly when the change in beach profile 

 was small (i.e., the beach profile almost stable under the incident waves), 

 the distributions take on a more complex form with multiple peaks for onshore- 

 and offshore-directed transport appearing along the profile. If the beach 

 profile is close to an equilibrium shape under the incident waves, it is 

 expected that the transport rate distribution will not show such a strong net 

 overall trend as compared to a profile that is far from equilibrium with the 

 imposed waves. Distributions rarely occurred having a peak for onshore- 

 directed transport on the foreshore and a peak for off shore -directed transport 

 located more seaward, and then only if minor changes in the profile occurred. 



319. Kajima et al . (1983a) proposed a classification, similar to that 

 developed in this study, in which three basic distribution types and two 

 subdivisions were defined. One of their main distributions differs from that 

 presented here. Their distribution corresponding to Type AE has a peak with 

 onshore -directed transport located shoreward of the peak with offshore - 

 directed transport which is opposite to the present classification. The two 

 subdivisions each contain three peaks, varying in direction onshore and 

 offshore. Sawaragi and Deguchi (1981) derived distribution shapes from 



127 



