Unc1as<;ifipd 



SECURITY CLASSIFICATION OF THIS PAOE(Whan Dmtm BnlfO) 



20. ABSTRACT (Concluded) 



gradient. It has been spplied to the Mississippi Sound, and results agree 

 well with measured surface displacements and currents during two episodes. 



Rates of entrainment and deposition of the Mississippi Sound sedi- 

 ments have been studied in a laboratory flume. Effects of (1) bottom 

 shear stress, (2) bed properties, (3) salinity of water, and (4) sediment 

 type on the erodability of sediments have been examined. Results of the 

 laboratory study have been incorporated into the bottom boundary conditions 

 for a three-dimensional sediment dispersion model. Gravitational settling 

 and particle size distribution of the Mississippi Sound sediments were 

 also studied in laboratories. 



Bottom boundary layer dynamics and wave effect on sediment dispersion 

 have been studied by means of a turbulent transport model and a wave model. 

 Model simulations of sediment dispersion in the Mississippi Sound agree 

 well with available data from ship surveys. 



Unclassified 



SECURITY CLASSIFICATION OF THIS PACEflWien Dtim Enl;md) 



