The regression relationship given by Equation 22 contains a coefficient (0.40) 

 which is dimensional, since the units of A are m"-^. Effort was made to form 

 a nondimensional quantity involving A and a relevant wave or sand property, 

 but no significant dependence was achieved. 



Measured Spatial Decay Coef. (nr 



Figure 45 . Comparison of spatial decay rate coefficients 

 and an empirical predictive expression 



349. Accretionary cases . A similar analysis of the decay of the 

 transport rate for the zone seaward of the break point was carried out for 

 cases which showed mainly onshore transport. Coefficients of determination 

 obtained by least- squares fitting of an exponential decay function were in 

 almost all cases greater than 90 percent for the individual transport rate 

 distributions. Figure 47 illustrates, in analogy with Figure 45, the decay in 

 the transport rate seaward of the break point and the corresponding calculated 

 result from the regression equation (coefficient of determination 95 percent) 

 for a typical case (Case 101). Transport was directed onshore at all times. 



350. Spatial decay coefficients for accretionary cases were in general 

 smaller than for erosional cases, indicating that a larger portion of the 

 profile seaward of the break point was affected by the waves for the accre- 



143 



