The value of Dgr is used to categorize the sediment as coarse or transitional, with 

 the following coefficients n, m, A, and C (which are used to compute sediment transport 

 rates) defined for the two sediment classifications: 



a. Coarse sediments: Dgr > 60. 



n = 0.0 

 m = 1.50 

 A = 0.17 

 C = 0.025 



b. Transition sediments: 1.0 < Dgr < 60.0 



n = 1.00- 0.56 log(D) 



(8) 



. = ^.1.34 



(9) 





(10) 



log C = 2.86 log D^, - (log D^, )' - 3.53 



(11) 



The second nondimensional parameter, Fgr , represents particle mobility defined as 

 the ratio of shear forces to the immersed sediment weight. The general form of the 

 relationship is 



F„ = 



^gD[s-\) 



321og|10- 



(12) 



A Predictive Model for Sediment Transport at the Portland Disposal Site, Maine 



