Quantification of uncertainties in a 2D hydraulic model for the Dutch river Rhine using expert opinions

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Abstract

Hydraulic–morphological river models are applied to design and evaluate measures for purposes such as safety against flooding. These numerical models are all based on a deterministic approach. However, the modeling of river processes involves numerous uncertainties. The aim of this study is to identify the sources of uncertainty that induce the largest uncertainties in the model outcomes and quantify this uncertainty using expert opinions. Experts have been selected based on a Pedigree matrix. The selected experts are asked to list and quantify the most important uncertainty sources for two situations: (1) the computation of design water levels (DWL) and (2) the computation of the hydraulic effect of a change in the river bed. The experts stated that the sources of uncertainty are different for the computation of the DWL and effect studies. The experts agreed that for DWL, the upstream discharge and the roughness predictor for the main channel have the largest uncertainty. For effect studies, no clear dominant source could be identified. The quantification of the uncertainty sources showed a significant effect on the predicted water levels under design discharge conditions.
Original languageUndefined
Title of host publicationEnvironmental hydraulics. Theoretical, experimental and computational solutions. Proceedings of the international workshop on environmental hydraulics, IWEH09, 29 - 30 October 2009, Valencia, Spain
EditorsP. Amparo Lopez Jimenez
Place of PublicationLondon
PublisherCRC Press
Pages195-198
ISBN (Print)978-0-415-56697-1
Publication statusPublished - 29 Oct 2009

Publication series

Name
PublisherCRC

Keywords

  • Hydraulic modeling
  • Expert opinions
  • IR-78722
  • Uncertainty Analysis
  • Uncertainty identification
  • Water management
  • METIS-262385
  • Pedigree

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