lOOOi- 



100 



10 



0.1 



5000 

 4000 



3000 

 2000 



1000 

 800 



600 

 500 



400 

 300 



^|,,:J,.^:|,.j^^i^^l^.M,^H^^-^p!-^--^ 



-1 1000 



^(-d) 



2 I 

 imensi 



4 16 18 20 22 24 

 onless ) 



Figure 4-29. Maximum bottom velocity from small-amplitude theory. 



With specified material characteristics, the right-hand side of equation 

 (4-23) is to be evaluated and Figure 4-29 then used to examine critical vave 

 conditions for initiation of sand motion. Tv«d of the three wave parameters 

 (water depth, wave height, and wave period) must be specified so that the 

 unknown parameter can be determined. If wave period is the unknown, the exact 

 solution must be formed by an iterative procedure (or use of the tables in 

 Appendix C) , due to the relationship between L and T (eq. 2-4). In an 



4-68 



