Towards the characterization of streamflow simulation uncertainty through multimodel ensembles

Konstantine P. Georgakakos, Dong Jun Seo, Hoshin Vijai Gupta, John Schaake, Michael B. Butts

Research output: Contribution to journalArticle

227 Citations (Scopus)

Abstract

Distributed hydrologic modeling holds significant promise for improved estimates of streamflow with high spatial resolution. However, uncertainty in model structure and parameters, which are distributed in space, and in operational weather radar rainfall estimates, which comprise the main input to the models, contributes to significant uncertainty in distributed model streamflow simulations over a wide range of space and time scales. Using the simulations produced for the Distributed Model Intercomparison Project (DMIP), this paper develops and applies sample-path methods to characterize streamflow simulation uncertainty by diverse distributed hydrologic models. The emphasis in this paper is on the model parameter and structure uncertainty given radar rainfall forcing. Multimodel ensembles are analyzed for six application catchments in the Central US to characterize model structure uncertainty within the sample of models (both calibrated and uncalibrated) participating in DMIP. Ensembles from single distributed and lumped models are also used for one of the catchments to provide a basis to characterize the impact of parametric uncertainty versus model structure uncertainty in flow simulation statistics. Two main science questions are addressed: (a) what is the value of multimodel streamflow ensembles in terms of the probabilistic characterization of simulation uncertainty? And (b) how do probabilistic skill measures of multimodel versus single-model ensembles compare? Discussed also are implications for the operational use of streamflow ensembles generated by distributed hydrologic models. The results support the serious consideration of ensemble simulations and predictions created by diverse models in real time flow prediction.

Original languageEnglish (US)
Pages (from-to)222-241
Number of pages20
JournalJournal of Hydrology
Volume298
Issue number1-4
DOIs
StatePublished - Oct 1 2004
Externally publishedYes

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stream flow
streamflow
uncertainty
simulation
model uncertainty
radar
hydrologic models
rain
prediction
catchment
rainfall
space and time
statistics
weather
sampling
spatial resolution

Keywords

  • Distributed hydrologic modeling
  • Flow forecasting
  • Forecast reliability
  • Multimodel ensemble prediction
  • Parameter uncertainty

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Cite this

Towards the characterization of streamflow simulation uncertainty through multimodel ensembles. / Georgakakos, Konstantine P.; Seo, Dong Jun; Gupta, Hoshin Vijai; Schaake, John; Butts, Michael B.

In: Journal of Hydrology, Vol. 298, No. 1-4, 01.10.2004, p. 222-241.

Research output: Contribution to journalArticle

Georgakakos, Konstantine P. ; Seo, Dong Jun ; Gupta, Hoshin Vijai ; Schaake, John ; Butts, Michael B. / Towards the characterization of streamflow simulation uncertainty through multimodel ensembles. In: Journal of Hydrology. 2004 ; Vol. 298, No. 1-4. pp. 222-241.
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