Figure 2: Different sources of mixing scenarios
Sink
classification
Classification of sinks to contaminant cascades
Chin et al. [27] proposed an indicator to identify the sinks’
contaminant cascades and limiting contaminants. For a problem with ’k’
contaminants with ’N’ internal sources, assuming a single sink (SK1),
the real freshwater target is shown in Eq (3) – see the derivation in
Appendix A- Eq (A13). To identify the preferred source ranking for the
specific sink, the ratio of sink concentration to the source
concentration play an important role. It has been proposed that the
largest source concentration of contaminant ’k’
(Ck,SR_max) is used because it also shows exactly the
prioritisation of sources if more than two sources are used. For
example, if the coefficient of FSR1,SK1 is more negative
than FSR2,SK1, then SR1 should be prioritised. The
maximum source concentration can also be treated as a normalisation
constant.