How uncertain is model-based prediction of copper loads in stormwater runoff?

Erik Ulfson Lindblom, S. Ahlman, Peter Steen Mikkelsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this paper, we conduct a systematic analysis of the uncertainty related with estimating the total load of pollution (copper) from a separate stormwater drainage system, conditioned on a specific combination of input data, a dynamic conceptual pollutant accumulation-washout model and measurements (runoff volumes and pollutant masses). We use the generalized likelihood uncertainty estimation (GLUE) methodology and generate posterior parameter distributions that result in model outputs encompassing a significant number of the highly variable measurements. Given the applied pollution accumulation-washout model and a total of 57 measurements during one month, the total predicted copper masses can be predicted within a range of +/-50% of the median value. The message is that this relatively large uncertainty should be acknowledged in connection with posting statements about micropollutant loads as estimated from dynamic models, even when calibrated with on-site concentration data.
Original languageEnglish
JournalWater Science and Technology
Volume56
Issue number11
Pages (from-to)65-72
ISSN0273-1223
DOIs
Publication statusPublished - 2007

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