u =6.09 cm/sec, and 1^^=13.79 sec. 



143 



Figure 6.7 



Figure 6.8 - (a 



Figure b.9 



Figure 6.10- ( 



Figure 6.11- 



Rotating laboratory flume for deposition-entrainment 



studies on sediments 145 



Bottom shear stress within the flume as a function of the 

 rotational speed of the rotating lid 146 



Typical time history of suspended sediment concentration 



within the flume. Sediments from Site 1 of the Mississippi Sound 



and with 1 day settling 150 



Same as (a) except for shale-based sediments 150 



Equilibrium concentration (Cg„) of suspended 

 sediments as a function of bottom shear stress {t ^) 



in fresh water 152 



iame as (a) except in salt water 152 



Time history of suspended sediment concentration for 

 Site-1 sediments in fresh water with 3 day settling . . . 

 Same as (a), except with 5 day settling 



Time history of suspended sediment concentration for 

 Site 3 sediments in salt water with 3 day settling. . . . 

 Same as (a), except with 10 day settling 



Figure 6.12- 

 Figure 6.13- 

 Figure 6.14- 

 Figure 6.15- 



Figure 6.16- 



Figure 7.1 - 

 Figure 7.2 - 



Figure 7.3 - 

 Figure 7.4 - 



Equilibrium concentration of suspended sediments as a 

 function of settling time in fresh and salt water. . . 



Time history of suspended sediment concentration for 

 Site 1 sediments in salt water with 3 day settling . 



Equilibrium concentration of suspended sediments as 

 a function of salinity 



Hydrodynamic resistance to deposition as a function 

 of stability for three values of bottom roughness and 

 reference height 



Comparison of a deposition velocity model with data: 



(a) Lane and Stukel's data 



(b) Sehmel 's data 



Rate of entrainment of cohesive sediments in fresh water 

 versus bottom shear stress 



Rate of entrainment of cohesive sediments in salt water 

 versus bottom shear stress 



(a) Site 3 sediments with 1 day settling 



(b) Site 1 sediments with 3 day settling 



(a) Rate of entrainment as a function of settling time 

 in fresh and salt water 



(b) Rate of entrainment as a function of salinity . . . 



Suspended sediment concentration at the end of one complete 

 tidal cycle on 9/04/80. No settling; Zero net flux at bottom. 

 (a) Near-surface cencentration 



154 

 154 



155 

 155 



158 

 158 

 160 



163 



166 

 166 

 166 



171 



172 

 172 

 172 



173 

 173 



175 



IX 



