Does a discontinuous CORMIX prediction mean that the model is not reliable?
A. No, most certainly not and in fact just the opposite. CORMIX is just reflecting the fact that mixing processes themselves do not always behave in a continuous manner. These phenomena are well supported by experimental data, and CORMIX simply reflects their occurrence. Flow processes can be unsteady because mixing is a turbulent and often chaotic process, where small changes in initial conditions can affect mixing behavior. Since CORMIX (like all other models) assumes steady-state discharge conditions, some jumps in dilution prediction may occur when changing ambient or discharge variables that force a transition from one flow class to another flow class. Therefore, some jumps in dilution may occur in sensitivity analysis when a change in discharge or ambient conditions causes a change in flow classification, i.e. a flow class transition. In reality, such a flow class transition in nature will tend to be an unsteady process. In such an unsteady transition, the observed flow process (
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