Wind Mixing and Resuspension

FIGURE 14.10 Schematic showing adsorption-desorption regulating solute concentration in the water 

In Lake Okeechobee, Elorida, Reddy and Eisher (1991) estimated that under normal wind events, the resuspension flux of soluble phosphorus can account for approximately 6-18 times the diffusive flux. In comparison, resuspension of loosely bound, organically rich sediments into the water column was found not to be a major factor for delaying the recovery of shallow Danish lakes (Jeppesen et al., 2003). However, the resuspension of nutrient-enriched benthic sediments (accumulated during eutrophication process) along with the diffusive flux can result in the release of nutrients supporting phytoplankton productivity and delay the overall recovery process. 

6 EXCHANGE OF DISSOLVED SOLUTES BETWEEN SOIL/SEDIMENT AND THE WATER COLUMN 

The exchange of dissolved solutes across the soil-floodwater interface is calculated using Pick s first law (see Section 14.3.1) (Berner, 1980) and Equation [14.12] 

In general, the total solute flux from sediments to overlying water column is the result of the sum of several mixing processes, which include molecular diffusion (Dg), biodiffusion (Dg), diffusion due to irrigation (D,), and mixing due to wave and current mixing The sum of all these effects 

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