Strathprints logo
Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Modelling uncertainty for flash floods in coastal plains using adjoint methods

Elhanafy, Hossam and Copeland, Graham J.M. (2007) Modelling uncertainty for flash floods in coastal plains using adjoint methods. In: Second International Conference and Exhibition Water Resources, Technologies and Services, 2007-06-06 - 2007-06-07, Sofia, Bulgaria. (Unpublished)

[img]
Preview
PDF (strathprints003616.pdf)
Download (541Kb) | Preview

    Abstract

    This paper shows the application of adjoint sensitivity analysis to flash flood wave propagation in a river channel. The adjoint sensitivity analysis is used to assess flood hazard in a coastal area caused by river discharge. The numerical model 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 using the adjoint equations and are specified in terms of water levels being greater than certain safe threshold levels along the channel. The flood propagation model is based on the St. Venant equations while the propagation of sensitivity information is based on the corresponding adjoint equations. This analysis is achieved using a numerical model that integrates The St. Venant equations forward in time using a staggered finite difference scheme. An enhanced method of characteristics at the downstream boundary provides open boundary conditions and overcomes the problem of reflections from the boundaries. Then, the adjoint model is integrated backwards in time to trace the sensitivity information back through the model domain towards the inflow control boundary. The adjoint model has been verified by means of an identical twin experiment.

    Item type: Conference or Workshop Item (Paper)
    ID code: 3616
    Keywords: flooding, flash floods, modelling, wave propagationad, adjoint equations, civil engineering, ocean engineering, Hydraulic engineering. Ocean engineering, Engineering (General). Civil engineering (General)
    Subjects: Technology > Hydraulic engineering. Ocean engineering
    Technology > Engineering (General). Civil engineering (General)
    Department: Faculty of Engineering > Civil and Environmental Engineering
    Related URLs:
    Depositing user: Dr Hossam Elhanafy
    Date Deposited: 08 Jun 2007
    Last modified: 21 Jul 2013 18:21
    URI: http://strathprints.strath.ac.uk/id/eprint/3616

    Actions (login required)

    View Item

    Fulltext Downloads: