25. Plots of N s , H D /L S , H D /d s , E/L x , d s /L s , ^/Lj , and d 1 /d s 

 for all of the 3-D tests are presented in Plates 4-21. The data plots are 

 separated based on whether they are for trunks or heads, 90-deg or oblique 

 wave attack, and the type of facility the tests were conducted in. The last 

 test was done to see if the steeper foreslope used in the T-shaped basin would 

 affect the data trends differently from the milder slope in the L- shaped test 

 facility. 



26. The wealth of data points per plot is less for the 3-D tests than 

 for the 2-D tests addressed earlier; but where sufficient data exist, the same 

 trends or lack of data trends as exhibited by the 2-D data are seen in the 3-D 

 plotted data. Stability number shows no significant trend with increasing 

 values of wave steepness and relative wave height, but these data do show that 

 all tests apply to breaking wave test conditions. Stability numbers versus 

 relative berm length shows no obvious trend, while plots of N s versus d s /L s 

 and di/L-L show a trend for stability to increase with increasing values of 

 relative water depth. A strong trend is shown when N s is plotted against 

 relative berm depth d 1 /d s . Stability number shows a definite trend of 

 increasing with increasing relative berm depth. 



2-D and 3-D Toe Berm Stone Tests 



27. Figures 11 and 12 present N s plotted against relative water depth 

 at the toe and relative berm depth, respectively, for all tests. The stabil- 

 ity number shows a trend with both parameters, but the trend with relative 

 berm depth appears to be stronger. Contours of equal stability number were 

 incorporated into a plot of relative berm depth versus relative water depth at 

 the toe (Figure 13). This plot reveals that within the range of conditions 

 tested toe berm armor stability shows only a minor overall dependency on 

 variations in wave length (i.e., wave period) and that the major parameter in 

 selecting a breaking wave stability number is relative berm depth. A plot of 

 stability number cubed versus d 1 /d s for all tests is presented in Figure 14. 

 This plot allows the direct reading of N^ for use in Equation 2 to calculate 

 the required berm armor weight W 50 . As explained in the plot legend, the 

 data for various test categories are plotted using various symbols. For a 

 given relative berm depth, there is no great difference in stability asso- 

 ciated with differing angles of wave attack or location of the berm stone on 



23 



