Length of Reach Contributing to Inland Transport 

 eight different possible 

 wind directions, that is, 

 N, NE, E, SE, S, SW, W, 

 and NW, it seems that 

 only four directions 

 cause inland sand trans- 

 port at Salmon Beach. 

 These directions are N, 

 NW, W, and SW. The per- 

 pendicular projections 



Considering the 



iy,. l^ 



and 



respectively, of these 

 directions (Figure 4) 

 were measured and shown 

 in Table 3. These 

 lengths i^' ^2' ^3' ^""^ 

 •^4 represent i in Equa- 

 tion 12 for total trans- 

 port calculations. 



Fig. 4 



Shear Velocity U.;,. Equation 10 was used to obtain U^ as follows 



U = 6.13 U^ Log — + U' 

 Z' 



13 U,, Log -^ = U - U' 

 Z' 



u^ = 



U - U' 



6.13 Log 2' 



(13) 



U' and Z' were calculated using Zingg's formula and are tabulated 

 in Table 4. 



Equation 13 was used to determine U_,,. All wind-speed measurements 

 were made 18 feet above the sand surface, so this value was used for Z 

 in Equation 13 throughout the calculations. 



A sample calculation is 



Reach 1 



d^Q = 1.3 mm 

 From Table 4, 



Z' = 0.0427 ft. 

 U' = 38.00 ft/sec 



