the tank wall. Some profiles were thus taken only to show these direct 

 local effects, and so extended only a portion of the length of otEier 

 prof i les. 



2. General Description of Tables I through 8 



Tables I through 8 list variously the basic conditions that exi^sted 

 for each run, and some of the changes caused by the presence and operation 

 of the device. 



Table I lists the test type of each run; that is, whether the device 

 remained at a single location throughout a run, a static test; or whether 

 it was moved periodically during the run, a mobile test. The condition of 

 "the slope prior to each run is also listed, that is, whether the slope was 

 in approximate equilibrium with the wave condition to be tested, or whether 

 the slope was the result of the preceding run. This listing defines the 

 solid line profile on Figures 6 through 21. The length of time each run 

 lasted is also noted in Table I, in model terms, in minutes and in equiva- 

 lent hours and minutes for prototype derived by reducing the model times to 

 hours and multiplying them by the square root of the scale factor, 3.873, 

 according to Froude relationships. 



Table 2 lists the offshore water depth, wave periods, and average off- 

 shore wave height that prevailed for each run, in both model and prototype 

 terms. 



Table 3 lists the changes in the average wave height caused by the 

 presence and operation of the device for Runs I through 7. The offshore 

 wave gage, as noted in Figures 5 through 21, was placed outside the mouth 

 of the flume in 2 feet of water in the model, the equivalent of 30 feet in 

 the prototype (except as specified In Table 2). This measurement was made 

 a distance offshore from the end wall of the wave tank of 43 feet in the 

 model, 645 feet in the prototype. The inshore wave gage was located at 

 various places between the device and the intersection of the bottom profile 

 with the Stillwater line. Due to the changing profiles, this gage was ope- 

 rated in various water depths and located as shown on the comparative pro- 

 f i les for the first seven individual runs (Figures 6 through 12). The use 

 of this gage was terminated after Run 7 due to calibration problems. The 

 inshore gage was located an average distance of 10.4 feet in the model, or 

 156 feet in the prototype, from the end wall of the tank. Another column 

 in Table 3 lists, for the applicable runs, the percentage of average wave 

 height reduction inshore of the device caused by its presence and operation- 

 Table 4 lists the location of the device at the beginning and end of 

 each run relative to the end wall of the wave tank in both model and proto- 

 type terms. An additional column lists the distance the device was moved 

 in mobile tests, again in both model and prototype terms. 



Table 5 defines the device setting for each run, that is, the depth 

 (in feet) of the deepest part of the device below the Stillwater surface 



12 



