Implementation of ADER scheme for a bore on an unsaturated permeable slope

K. Steenhauer, D. Pokrajac, T. O'Donoghue

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The paper details the implementation of the Godunov-type finite volume Arbitrary high order schemes using Derivatives (ADER) scheme for the case of a large source term in the continuity equation of the nonlinear shallow water equations. The particular application is the movement of a bore on a highly permeable slope. The large source term is caused by the infiltration into the initially unsaturated slope material. Infiltration is modelled as vertical downwards piston-like flow with Forchheimer quadratic parameterisation of the resistance law. The corresponding ODE is solved using the fourth-order Runge-Kutta method. The surface and subsurface flow models have been tested by comparison with analytical solutions. Example predictions of surface bore propagation and wetting front propagation are presented for a range of slope permeabilities. The effects of permeability on bore run-up, water depths and velocities are illustrated. The ADER scheme is capable of handling the source term, including the extreme case when this term dominates the volume balance.
Original languageEnglish
Pages (from-to)682-702
Number of pages21
JournalInternational Journal for Numerical Methods in Fluids
Volume70
Issue number6
Early online date9 Nov 2011
DOIs
Publication statusPublished - 30 Oct 2012

Keywords

  • bore
  • surface flow
  • subsurface flow
  • infiltration
  • permeability
  • ADER scheme

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