Lippmann and Holman (1990) presented a classification scheme for defining 

 bar types that includes morphologies for highly reflective beaches to fully 

 dissipative beaches (see Figure 12). Bar types are classified into eight possible 

 states such that scaling and alongshore variability define the morphology as 

 either resulting from infragravity or incident wave processes. Based on their 

 classification scheme, a 2-year data set from the FRF revealed that longshore- 

 variable morphology was most frequently observed (68 percent of the cases 

 periodic, 1 7 percent nonperiodic), and that the more transient linear bars were 

 observed infrequently (15 percent of the cases). Infragravity scaled morphology 

 accounted for 91 percent of the observed bar types. 



8-BAR TYPE CLASSIFICATION SCHEME 



BAR TYPE H : DISSIPATIVE 



(unbarred; infragravity scaled surf zone) 



BAR TYPE G : INFRAGRAVITY SCALED 2-D BAR 



(no longshore variability; infragravity scaling) 



BAR TYPE F : NON-RHYTHMIC, 3-D BAR 



(longshore variable; non-rhythmic; continuous trough; infragravity 

 scaling) 



BAR TYPE E : OFFSHORE RHYTHMIC BAR 



(longshore rhythmicity; continuous trough; infragravity scaling) 



BAR TYPED : ATTACHED RHYTHMIC BAR 



(longshore rhythmicity; discontinuous trough; infragravity scaling) 



BAR TYPE C : NON-RHYTHMIC, ATTACHED BAR 



(no coherent longshore rhythmicity; discontinuous trough; 

 infragravity scaling) 



BAR TYPE B : INCIDENT SCALED BAR 



(little or no longshore variability; may be attached; incident scaling) 



BAR TYPE A : REFLECTIVE 



(unbarred; incident scaled surf zone) 



Figure 12. Classification scheme defining bar morphology (after Lippmann 

 and Holman (1990)) 



Chapter 3 Infragravity Waves, Nearshore Morphology, and Sediment Transport 



27 



