A conservative, semi lagrangian fate and transport model for fluvial systems - I. theoretical development

J. Russell Manson, Stephen George Wallis

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    In this paper a new conservative, semi-Lagrangian fate and transport model for fluvial systems is presented. Following an outline of the current trends in water quality modelling, the main features of Eulerian and semi-Lagrangian modelling approaches are discussed. It is argued that an inherently conservative semi-Lagrangian approach offers a way of meeting the future needs of the industry. The semi-Lagrangian philosophy for advection is then outlined and further developed with the authors explaining how dispersive transport, simple first-order decay terms and inflow boundary conditions can be incorporated within the algorithm. The method (termed DISCUS) possesses high accuracy but, in contrast to other semi-Lagrangian fluvial transport codes, it is centred around a finite-volume based mass balance, which guarantees mass conservation and makes it amenable to flux limiting techniques for suppressing non-physical grid-scale oscillations. The method's semi-Lagrangian character allows it to work at very large time steps, which makes it efficient for long-term and multiple scenario simulations. The method's robustness and inherent stability make it particularly useful for highly non-uniform streams and variable loading conditions and also for complex interacting chemical species.

    Original languageEnglish
    Pages (from-to)3769-3777
    Number of pages9
    JournalWater Research
    Volume34
    Issue number15
    DOIs
    Publication statusPublished - 15 Oct 2000

    Keywords

    • Efficiency
    • Mass conservation
    • Model development
    • Pollutant transport
    • Rivers
    • Semi-Lagrangian

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