designated as berm. The solid line in Figure 6, drawn so as to separate re 

 gions corresponding to bar and berm profiles, is described by the following 

 equation: 



,3 



VwT/ 



f = 0.000 

 o 



Larson and Kraus (1988a) investigate several other previously proposed crite- 

 ria for predicting profile response as a function of wave and sand character- 

 istics. Kohler and Galvin' had previously used the fall velocity parameter in 

 an attempt to develop a bar/berm predictive criterion for the CE data set. 



Bar Evolution 



49. Various geometric properties pertaining to bar features were cal- 

 culated. These properties showed similar development in time, namely an 

 initially rapid response followed by a decrease in the rate of response with 

 approach to an equilibrium value. In the data set, 13 cases exhibited some 

 degree of bar formation, although only eight cases were classified as bar 

 profiles. The remaining five cases were characterized by accretion on the 

 foreshore, i.e., berm buildup. 



Bar volume 



50. Evolution of bar volume through time is illustrated in Figure 7 for 

 the 13 cases judged to exhibit a main breakpoint bar. Bars that developed on 

 profiles which predominantly accreted on the foreshore (onshore sand trans- 

 port) had smaller volumes than bars formed on profiles where offshore trans- 

 port predominantly occurred. Also, equilibrium bar volume on berm profiles 

 was reached much faster than on bar profiles, in most cases by the first 

 profile survey. Examples of such rapid bar buildup are Cases 101, 301, and 

 801. Larson and Kraus (1988a) discuss the time evolution of bar volume and 

 relate it to incident wave parameters and sand characteristics. 



51. Note in Figure 7 that bar volume evolution is similar for Case 901 

 and the corresponding case with water level variation (Case 911). In some 

 cases, if a second bar formed shoreward of the main breakpoint bar, the two 

 bars tended to grow together, appearing to hinder development of the main 

 breakpoint bar. Examples are Cases 300 and 700. 



27 



