Calibration resuspension velocities

Figure 2. Calibrated resuspension velocities versus flow in the lower Fox River (Reprinted with permission of the International Association of Great Lakes Research, reference 1.)...

CFaT riverine models were presented for both the water column and bed sediment. They were then simplified to focus onto the non-flow resuspension soluble fraction using the quasi-steady state assumption to isolate the key water-side and sediment-side process elements. Field evidence of soluble release based on CFaT model derived data was reviewed for three rivers. Both the traditional particle background resuspension process and more recent soluble fraction process algorithms data interpretation were covered. Numerical field calibrated resuspension velocities and soluble mass-transfer coefficients were presented. Candidate water-side and sediment-side transport processes, selected from the literature were reviewed. Those that provided the best theoretical explanation and contained laboratory and/or field data support were selected. Finally, the flux and the overall transport coefficient which captures the essential features of the framework were presented. Following this the theoretical mass-transfer coefficients were applied to a site on the Fox River below De Pere Dam. Numerical calculations were made for the transport coefficients for both individual and combined processes. 

In order to assess resuspension at a shallow (0.25 m deep) site in the lake (Fig. 27.1(a)), Eq. (27.32) must be solved for the time-dependent concentration profile, with appropriately calibrated expressions for the erosion flux coefficients and the settling velocity. Pertinent measurements and analysis are described elsewhere. Parameters for simulation of concentration profile are summarized in Table 27.9. The organic-rich bottom is conveniently treated as bed (as opposed to fluid mud) in this analysis. 

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