Theory 75/Measurement & modelling/Hydrograph separation
Separation Is Event Against Pre-Event
The claim
Isotope hydrograph separation is reliable only when the ratio of event to pre-event isotopic contrast exceeds the analytical precision, so a small contrast yields meaningless fractions.
01Mechanism
The mixing fraction is inferred from a difference; noise in the difference propagates into the fraction.
02Prediction
Reliability should track the ratio.
03Refutation
Reliability tracking sample count would remove the contrast.