2a 

 D 



Figure 3. Design curves for equilibrium bed-form wavelength. 

 A/D is given as function of 2a/D and X2 by Mogridge 

 and Kamphuis (1972), and curves of constant 4) have 

 been added. (J) and X„ are defined by equations (1) 

 and (7). 



19 



