Identification and Quantification of Uncertainties in a Hydrodynamic River Model Using Expert Opinions
Tóm tắt
Hydrodynamic river models are applied to design and evaluate measures for purposes such as safety against flooding. The modelling of river processes involves numerous uncertainties, resulting in uncertain model outcomes. Knowledge of the type and magnitude of uncertainties is crucial for a meaningful interpretation of the model results and the usefulness of results in decision making processes. The aim of this study is to identify the sources of uncertainty that contribute most to the uncertainties in the model outcomes and quantify their contribution to the uncertainty in the model outcomes. Experts have been selected based on an objective Pedigree analysis. The selected experts are asked to quantify the most important uncertainties for two situations: (1) the computation of design water levels and (2) the computation of the hydraulic effect of a change in the river bed. For the computation of the design water level, the uncertainties are dominated by the sources that do not change between the calibration and the prediction. The experts state that the upstream discharge and the empirical roughness equation for the main channel have the largest influence on the uncertainty in the modeled water levels. For effect studies, the floodplain bathymetry, weir formulation and discretization of floodplain topography contribute most to the uncertainties in model outcomes. Finally, the contribution of the uncertainties to the model outcomes show that the uncertainties have a significant effect on the predicted water levels, especially under design conditions.
Tài liệu tham khảo
Ayyub BM (2001) Elicitation of expert opinions for uncertainty and risks. CRC Press, Florida, USA, ISBN 0-8493-1087-3
Bates PD, Horritt MS, Aronica G, Beven KJ (2004) Bayesian updating of flood inundation likelihoods conditioned on flood extent data. Hydrol Process 18(17):3347–3370. doi:10.1002/hyp.1499
Cooke RM (1991) Experts in uncertainty. Oxford University Press, Oxford, UK, ISBN 0-19-506465-8
Cooke RM, Goossens LHJ (2000) Procedures guide for structured expert judgement in accident consequence modelling. Radiat Prot Dosim 90(3):303–309
Funtowicz SO, Ravetz JR (1990) Uncertainty and quality in science for policy. Theory and decision library, series A, philosophy and methodology of the social sciences. Kluwer, Dordrecht, The Netherlands, ISBN 0-7923-0799-2
Groenenberg H, Van der Sluijs JP (2005) Valueloading and uncertainty in a sector-based differentiation scheme for emission allowances. Clim Change 71(1–2):75–115. doi:10.1007/s10584-005-5376-7
Hall JW, Solomatine D (2008) A framework for uncertainty analysis in flood risk management decisions. Journal of River Basin Management 6(2):85–98
Hall JW, Tarantola S, Bates PD, Horritt MS (2005) Distributed sensitivity analysis of flood Inundation model calibration. J Hydraul Eng 131(2):117–126. doi:10.1061/(ASCE)0733-9429(2005)131:2(117)
Hunter NM, Bates PD, Horritt MS, Wilson MD (2007) Simple spatially-distributed models for predicting flood inundation: a review. Geomorphology 90(3–4):208–225. doi:10.1016/j.geomorph.2006.10.021
Johnson PA (1996) Uncertainty in hydraulic parameters. J Hydraul Eng 122(2):112–114
Keith DW (1996) When is it appropriate to combine expert judgements? Clim Change 33(2):139–144. doi:10.1007/BF00140244
Krayer von Krauss MP, Casman EA, Small MJ (2004) Elicitation of expert judgments of uncertainty in the risk assessment of herbicide-tolerant oilseed crops. Risk Anal 24(6):1515–1527. doi:10.1111/j.0272-4332.2004.00546.x
Leendertse JJ (1967) Aspects of a computational model for long-period water-wave propagation. Ph.D. thesis, RM-5294-RR, Rand Corporation, Santa Monica, USA
Ministry of Transport, Public Works and Water Management (1995) Flood protection act. Ministry of Transport, Public Works and Water Management, The Hague, The Netherlands (in Dutch)
Morgan MG, Henrion M (1990) Uncertainty: a guide to dealing with uncertainty in quantitative risk and policy analysis. Cambridge University Press, Cambridge, UK, ISBN 0-521-36542-2
Ogink HJM (2003) Nauwkeurigheid toetspeilen. Tech. rep. Q3634, WL | Delft Hydraulics, Delft, The Netherlands (in Dutch)
Pappenberger F, Beven KJ, Horritt MS, Blazkova S (2005) Uncertainty in the calibration of effective roughness parameters in HEC-RAS using inundation and downstream level observations. J Hydrol 302(1–4):46–69. doi:10.1016/j.jhydrol.2004.06.036
Refsgaard JC, Van der Keur P, Nilsson B, Müller-Wohlfeil D, Brown J (2006a) Uncertainties in river basin data at various support scales - example from Odense pilot river basin. Hydrol Earth Syst Sci Discuss 3(4):1943–1985
Refsgaard JC, Van der Sluijs JP, Brown J, Van der Keur P (2006b) A framework for dealing with uncertainty due to model structure error. Adv Water Resour 29(11):1586–1597. doi:10.1016/j.advwatres.2005.11.013
Rijkswaterstaat (2007) Hydraulische randvoorwaarden primaire waterkeringen, voor de derde toetsronde 2006–2011 (HR 2006). Tech. rep., Ministry of Transport, Public Works and Water Management, The Netherlands (in Dutch)
Rijkswaterstaat (2009) User’s Manual WAQUA, versie 10.97. Rijkswaterstaat, The Netherlands (in Dutch)
Rowe G (1992) Perspectives on expertise in the aggregation of judgments. Springer, US, Chap 7, pp 155–180, ISBN 978-0-306-43862-2
Stijnen JW, Kok M, Duits MT (2002) Onzekerheidsanalyse hoogwaterbescherming Rijntakken. Tech. rep. PR464, HKV Lijn in water/Rijkswaterstaat, The Netherlands (in Dutch)
Van den Brink NGM, Beyer D, Scholten MJM, Van Velzen EH (2006) Onderbouwing hydraulische randvoorwaarden 2001 voor de Rijn en zijn takken. Tech. rep. 2002.015, Rijkswaterstaat, The Netherlands ISBN 90-3695-322-7 (in Dutch)
Van der Keur P, Henriksen HJ, Refsgaard JC, Brugnach M, Pahl-Wostl C, Dewulf A, Buiteveld H (2008) Identification of major sources of uncertainty in current IWRM practice. Illustrated for the Rhine basin. Water Resour Manage 22(11):1677–1708. doi:10.1007/s11269-008-9248-6
Van der Keur P, Brugnach M, DeWulf A, Refsgaard JC, Zorilla P, Poolman M, Isendahl N, Raadgever GT, Henriksen HJ, Warmink JJ, Lamers M, Mysiak J (2010) Identifying uncertainty guidelines for supporting policy making in water management illustrated for Upper Guadiana and Rhine basins. Water Resour Manage. doi:10.1007/s11269-010-9640-x
Van der Klis H (2003) Uncertainty analysis applied to numerical models of bed morphology. Ph.D. thesis, Delft University of Technology, Delft, The Netherlands
Van der Sluijs JP (1997) Anchoring amid uncertainty, on the management of uncertainties in risk assessment of anthropogenic climate change. Ph.D. thesis, Utrecht University, Utrecht, The Netherlands
Van der Sluijs JP (2002) A way out of the credibility crisis of models used in integrated environmental assessment. Futures 34(2):133–146. doi:10.1016/S0016-3287(01)00051-9
Van der Sluijs JP (2007) Uncertainty and precaution in environmental management: insights from the UPEM conference. Environ Model Softw 22(5):590–598. doi:10.1016/j.envsoft.2005.12.020
Van der Sluijs JP, Janssen PHM, Petersen AC, Kloprogge P, Risbev JS, Tuinstra W, Ravetz JR (2004) RIVM/MNP guidance for uncertainty assessment and communication: tool catalogue for uncertainty assessment. Tech. Rep. NWS-E-2004-37, Copernicus Institute and RIVM, Utrecht/Bilthoven, The Netherlands, ISBN 90-393-3797-7
Van der Sluijs JP, Craye M, Funtowicz S, Kloprogge P, Ravetz J, Risbey J (2005a) Combining quantitative and qualitative measures of uncertainty in model-based environmental assessment: the NUSAP system. Risk Anal 25(2):481–492. doi:10.1111/j.1539-6924.2005.00604.x
Van der Sluijs JP, Risbey JS, Ravetz J (2005b) Uncertainty assessment of VOC emissions from paint in the Netherlands using the NUSAP system. Environ Monit Assess 105(1–3):229–259. doi:10.1007/s10661-005-3697-7
Van Velzen EH, Jesse P, Cornelissen P, Coops H (2003) Stromingsweerstand vegetatie in uiterwaarden: deel 1 handboek versie–1 2003. RIZA report 2003.028, RIZA, The Netherlands (in Dutch)
Walker WE, Harremoës P, Rotmans J, Van der Sluijs JP, van Asselt MBA, Janssen PHM, Krayer von Kraus MP (2003) Defining uncertainty, a conceptual basis for uncertainty management in model–based decision support. Integr Assess 4(1):5–17
Wardekker JA, Van der Sluijs JP, Janssen PHM, Kloprogge P, Petersen AC (2008) Uncertainty communication in environmental assessments: views from the Dutch science-policy interface. Environ Sci Policy 11(7):627–641. doi:10.1016/j.envsci.2008.05.005
Warmink JJ, Janssen JAEB, Booij MJ, Krol MS (2010) Identification and classification of uncertainties in the application of environmental models. Environ Model Softw 25(12):1518–1527. doi:10.1016/j.envsoft.2010.04.011