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Major Features of AULOS

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Cell Integrals

Waikato Cascade Analysis Facility

Major Features of AULOS

  • Handles looped networks of pipes and open channels, as found in most real-world situations.
  • Cell integral analysis gives very fast computation, so you can try more scenarios.
  • Offers both momentum and energy solutions, to ensure the appropriate constraint is used in most situations.

    • Other Features

  • Offers energy head or water level matching at junctions.
  • Overfalls are handled automatically.
  • Shallow street flows can be modelled.
  • Handles supercritical flows to over 20% slope.
  • Use a simple drawdown start for any network.
  • Whitham front analysis of flood surges or tsunami.
  • A range of control structures.
  • Extensive data consistency checks.
  • Links with GIS or graphing software for result presentation.
  • Optional proven real time control extensions
  • Transfers existing models from many other packages

    • Cell Integrals

    Cell integral analysis uses piecewise analytical integration instead of finite difference techniques to get a great increase in computation speed - up to 100 times faster! Briefly, this arises from the use of functions other than polynomials to extrapolate from a particular point of the solution. The better the function represents the physical system, the larger the steps which can be used to reliably extend the solution.

    The technique uses four dimensional finite volume cells to develop the complete mass, momentum and energy equation set, instead of the standard St Venant equations. This resolves dangerous conflicts between energy and momentum solutions when abrupt changes in cross section occur, especially at changes from open channels to pipes in artificial channels.

    Waikato Cascade Analysis Facility

    A cascade of eight dams generates hydroelectric power from the Waikato River, the largest in the North Island, New Zealand. During major floods, flow changes at any dam affect the operating conditions for all the others. This means that the operation of any control gate must be linked to the operation of all control gates. Generalised from principles developed for the Waikato problem, the AULOS Waikato Cascade Analysis facility now provides a logical structure through which operational flood management strategies can be developed and tested for any cascade of dams.


    Karapiro - the lowest of a cascade of eight hydropower schemes down the Waikato River, New Zealand.

    To download a short movie of the spillway flows from the Karapiro dam during the Feburary 2004 floods click here.

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