A new look at uncertainty in end member mixing models for streamflow partitioning

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dc.contributor.authorAdams, GAen_AU
dc.contributor.authorCornish, PSen_AU
dc.contributor.authorCroke, BFWen_AU
dc.contributor.authorHart, MRen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorJackeman, AJen_AU
dc.date.accessioned2021-06-10T01:00:11Zen_AU
dc.date.available2021-06-10T01:00:11Zen_AU
dc.date.issued2009-07-13en_AU
dc.date.statistics2021-03-11en_AU
dc.description.abstractChemical and isotope based hydrograph separation methods, such as end member mixing analysis (EMMA1), have been utilized in recent decades because they offer a better explanation of stream chemistry than can be obtained from flow partitions derived using graphical or mathematical filter hydrograph partitioning techniques (Chapman and Maxwell, 1996; Pinder and Jones, 1969). However, use of such constituent based hydrograph separation methods results in uncertain streamflow partitions, attributable, in part, to uncertainty in the characteristic chemical or isotope content of source waters (Figure 1) (Soulsby et al., 2003). This paper explores additional causes of uncertainty when using EMMA for flow partitioning. This paper shows that: • hydrograph partitioning based on measured end member constituent concentrations should not be assumed to be correct just because the stream chemistry is adequately explained; • propagating uncertainty estimated from sample variations will underestimate uncertainty in flow partitions; and • numerical problems during computation introduce considerable uncertainty into solved end member contributions. Sampling and measurement errors exacerbate the problem. © 2009 Creative Commons Attribution 4.0 International CC BY Licenseen_AU
dc.identifier.booktitle18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, Cairns Australia 13-17 July 2009en_AU
dc.identifier.citationAdams, G. A., Cornish, P. S., Croke, B. F. W., Hart, M. R., Hughes, C. E., & Jakeman, A. J. (2009). A new look at uncertainty in end member mixing models for streamflow partitioning. Paper presented to the 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, Cairns Australia 13-17 July 2009. In Anderssen, R. S., R. D. Braddock and L. T. H. Newham (eds) 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, Cairns Australia 13-17 July 2009, pp. 3039-3045. Retrieved from: https://mssanz.org.au/modsim09/I1/adams_ga.pdfen_AU
dc.identifier.conferenceenddate17 July 2009en_AU
dc.identifier.conferencename18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulationen_AU
dc.identifier.conferenceplaceCairns, Australiaen_AU
dc.identifier.conferencestartdate13 July 2009en_AU
dc.identifier.editorsAnderssen, R.S., R.D. Braddock and L.T.H. Newhamen_AU
dc.identifier.issn978-0-9758400-7-8en_AU
dc.identifier.pagination3039-3045en_AU
dc.identifier.urihttps://mssanz.org.au/modsim09/I1/adams_ga.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10834en_AU
dc.language.isoenen_AU
dc.publisherModelling and Simulation Society of Australia and New Zealand Incen_AU
dc.subjectPartitionen_AU
dc.subjectWater qualityen_AU
dc.subjectSamplingen_AU
dc.subjectIsotopesen_AU
dc.subjectStreamsen_AU
dc.subjectChemistryen_AU
dc.subjectWater chemistryen_AU
dc.titleA new look at uncertainty in end member mixing models for streamflow partitioningen_AU
dc.typeConference Paperen_AU
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