Longshore Energy Flux Factor, Pgj (J/(s-m of beach)) 

 10 102 



10 10^ 



Longshore Energy Flux Factor, Pjj (ft-lbs/(s-iinear ft of beach)) 



Figure 4-37. Design curve for longshore transport rate versus energy flux 

 factor. (Only field data are included.) 



1 , , Or) data and Figure 4-38 or the (H^ 

 Figure 4-39 are needed. If 



rate, only the (H 



, a ) data and 

 SO o 



the shoaling coefficient is significantly 



different from 1.3, multiply the Q 



0.88 Vk~ (see Table 4-11, assumption 2d). 



o 



obtained from Figure 4-39 by the factor 



Figure 4-39 applies accurately only if a is a point value. If a is 

 a range of values, for example a 45-degree sector implied by the direction 

 northeast, then the transport evaluated from Figure 4-39 using a single value 

 of a for northeast may be 12 percent higher than the value obtained by 

 averaging over the 45-degree sector implied by northeast. The most accurate 

 approach is given in the example problem of Section V,3,c. 



4-97 



