How does CORMIX simulate tidal re-entrainment?
A. CORMIX is a steady-state model, whereas tidal environments are inherently unsteady. Because most regulatory mixing zone analysis requires “worst case” dilution analysis, analysts sometimes consider conditions at slack tide (often zero ambient velocity) as representative of the “worst case”. However, minimum initial dilution generally will not occur at slack tide, but shortly after slack tide when the plume re-entrains material remaining from the previous tidal cycle. In tidal mode, CORMIX considers the reduction in initial dilution due re-entrainment of material remaining from the previous cycle. It does not consider unsteady build-up of material over several tidal cycles, it assumes a complete flushing of the historic plume in the near-field, will occur within a tidal cycle. If unsteady build-up in the near-field or far-field over multiple tidal cycles is likely at your site, additional methods of analysis may be necessary. Section 8.6 in Technical Guidance Manual for Performing Wa
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