Figure 3 . View of the wave generator in the LWT 



collection of profile surveys for a unique combination of incident waves, 

 beach slope, and grain size. A "run" is more loosely used to refer to either 

 a case or an interval of wave action between two profile surveys. 



173. Profile surveys were made intermittently during a run with shorter 

 time increments in the beginning when large profile changes where expected. 

 On the order of 10-15 profile surveys were made during a typical case, and the 

 survey interval was 1.2 m (4 ft). For the initial cases with the 0.22-mm sand 

 and all cases with the 0.40 -mm sand, profiles were surveyed along three 

 different lines in the tank . Corresponding differences in depth between the 

 three lines were small, and for the 0.22-mm sand only the survey along the 

 center line was retained. However, for the 0.40-mm sand, although the cross- 

 tank depth difference was small, surveys along three lines were made through 



Personal Communication, 1986, George W. Simmons, Former Engineering 

 Technician, Beach Erosion Board , Dalecarlia Reservation, Washington, DC, 



49 



