Figure 5.30- Surface displacement contours within the Mississippi coastal 



waters due to a westerly wind 113 



Figure 5.31- Bottom stress field within the Mississippi coastal 



waters due to a westerly wind 113 



Figure 5.32- Same as Figure 5.29 except with a different lateral 



boundary condition along the east open boundary 114 



Figure 5.33- Steady-state currents driven by a fixed salinity 



gradient at the ocean boundary and fixed river flow at the 



land boundary 116 



Figure 5,34- (a) Measured surface salinity field on 9/02/80 and 



9/03/80 118 



(b) Measured surface salinity field on 9/08/80 and 9/09/80. . 118 



(c) Measured surface temperature field on 9/02/80 and 9/03/80 119 



(d) Measured surface temperature field on 9/08/80 and 9/09/80 119 



Figure 5.35- Wind driven currents in an open channel 121 



(a) Vertical profile of horizontal velocities 121 



(b) Vertical profiles of vertical turbulent velocity 



and vertical eddy viscosity 121 



Figure 5.36- The formation and deepening of thermocline in a 20 m deep 

 and 100 km wide basin with an applied wind stress of 

 0.2 dyne/cm*^ and a surface heating rate of 0.01 cal/cm^-sec. . 122 



(a) Temperature profile 122 



(b) Velocity profile 122 



Figure 5.37- The formation and deepening of thermocline in a 20 m deep and 

 100 km wide„basin with an applied wind stress of 

 0.5 dyne/cm'^ and a surface heating rate of 0.01 cal/cm'^-sec. . 123 



(a) Temperature profile 123 



(b) Velocity profile 123 



Figure 6.1 - Dominant mechanisms affecting the dispersion of 



sediments within a coastal environment 126 



Figure 6.2 - Particle size (settling velocity) distribution of 



cohesive sediments in fresh and salt water 126 



Figure 6.3 - Same as Figure 6.2 except for sediments from (a) Site-2; 



and (b) Site-4. See Figure 1.3 for location of sites 134 



Figure 6.4 - (a) Settling velocity of Site-1 sediments determined from 



settling cylinder measurements and grain size analysis. . 136 

 (b) Same as (a) except for Site-4 sediments 136 



Figure 6.5 - Friction factors under a purely oscillatory turbulent 



boundary layer (from Riedel, et al., 1972) 140 



Figure 6.6 - Vertical profile of: 



(a) mean velocity 143 



(b) twice the turbulent kinetic energy, and 143 



(c) Reynolds stress within a combined current-wave bottom 



boundary layer. z„=0.2 cm, u =10.21 cm/sec, 

 •' -' '100 ' 



