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Estimation of predictive uncertainties in flood wave propagation in a river channel using adjoint sensitivity analysis

Elhanafy, H. and Copeland, G.J.M. and Gejadze, I.Y. (2008) Estimation of predictive uncertainties in flood wave propagation in a river channel using adjoint sensitivity analysis. International Journal of Numerical Methods in Fluids, 56 (8). pp. 1201-1207. ISSN 0271-2091

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Abstract

This paper applies adjoint sensitivity analysis to flash flood wave propagation in a river channel. A numerical model, based on the St-Venant equations and the corresponding adjoint equations, determines the sensitivities of predicted water levels to uncertainties in key controls such as inflow hydrograph, channel topography, frictional resistance and infiltration rate. Sensitivities are calculated in terms of a measuring function that quantifies water levels greater than certain safe threshold levels along the channel. The adjoint model has been verified by means of an identical twin experiment. The method is applied to a simulated flash flood in a river channel. The sensitivities to key controls are evaluated and ranked and the effects of individual and combined uncertainties on the predicted flood impact are also quantified.

Item type: Article
ID code: 19723
Keywords: data assimilation, open channel flow, adjoint sensitivity analysis, numerical models, St-Venant equations, Engineering (General). Civil engineering (General)
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Civil and Environmental Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 20 May 2010 20:01
    Last modified: 17 Jan 2013 14:50
    URI: http://strathprints.strath.ac.uk/id/eprint/19723

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