Dynamic Links

TUFLOW’s 2D and 1D solution schemes are designed to be dynamically linked with other schemes. The external scheme is set up to access the TUFLOW_LINK.dll so that TUFLOW and the external scheme share memory and linking routines to maximise speed of data transfer and computations. The linkages are simply set via snapped objects in one or or more GIS layers, or the Graphical User Interface. The external schemes also utilises TUFLOW’s features for displaying 1D and 2D output merged as one.

Examples of established links are ISIS-TUFLOW, ISIS-TUFLOW-PIPE and XP-SWMM.

TUFLOW’s 1D/2D dynamic linking is arguably the world’s most powerful. This image shows a calibrated model with the concrete lined channels and structures modelled in 1D dynamically linked to the 2D floodplain. TUFLOW doesn’t just use a weir equation, but the full 2D equations to preserve momentum across the 1D/2D interface under sub-critical flows, with automatic switching to upstream controlled weir flow for flow over levees.

In early 2004, TUFLOW was benchmarked against other packages in preparation for selecting a modelling system for the Tidal Thames Embayments Inundation Study. The investigations were commissioned by the UK Environment Agency who requires a tool to improve its ability to plan for and manage a storm tide flood event that breaches or overtops the defences along the River Thames, London. This tool would generate predictions to give emergency response teams and the public reliable information regarding the extent, timing and nature of the propagation of floodwaters. Halcrow, in conjunction with HR Wallingford, were commissioned to carry out the study and the benchmarking.

Pipe network modelling linked to overland 2D flows is now commonly used by TUFLOW modellers for urban areas. TUFLOW’s 1D solution can also be dynamically linked to ISIS models.

After the benchmarking, TUFLOW was selected as the preferred 2D system. In July 2004, the ISIS 1D engine and TUFLOW engine were then dynamically linked and merged as one computational engine. The ISIS-TUFLOW engine is now being used to cover all 23 embayments through the City of London. The EA's considerable investment in the Thames ISIS 1D model has been preserved, and the 2D capabilities of TUFLOW allows the complex flow patterns in the embayments, associated with breaching or overtopping of the defence walls, to be accurately modelled.

The new ISIS-TUFLOW-PIPE now offers even more flexibility with direct 1D/1D linking between TUFLOW (ESTRY) 1D elements and ISIS units. This allows, for example, a TUFLOW pipe network to be dynamically linked to ISIS river units, which can all be linked to TUFLOW 2D domain(s).

For more information on ISIS-TUFLOW or ISIS-TUFLOW-PIPE click here.For a flyer on ISIS-TUFLOW-PIPE click here

Please see XP-2D page

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Dynamic Links