How to link a 1D model to a TUFLOW (ESTRY) model

Why link these two pieces of software?

The TUFLOW Link allows users to link existing Flood Modeller 1D models dynamically with a 2D model built in TUFLOW, and also establish a link between Flood Modeller 1D Model and TUFLOW’s 1D component (ESTRY).

A typical application of the models linked in this way would be representation of an inundation of a floodplain or urban area, with the river modelled by the Flood Modeller 1D solver, the spilling and inundated area modelled by the TUFLOW component and culverts and other structures on the inundated area modelled in the ESTRY component of TUFLOW.

Which software is linked?

In this situation, Flood Modeller 1D Solver and TUFLOW with its 1D component (ESTRY) are linked.

How can this be done?

To physically link the models together, as with the link from the 1D Solver to TUFLOW only (i.e. TUFLOW 2D), it is possible to link the 1D Solver  to TUFLOW (1D) (i.e. TUFLOW with ESTRY component) in two ways, either by:

  1. Flood Modeller 1D solver calculating the water level and TUFLOW calculating the discharge (X1DH link), or

  2. Flood Modeller 1D solver calculating the discharge and TUFLOW calculating the water level (X1DQ link)

Typically, the X1DH link (i) will apply when the TUFLOW component is discharging into the 1D solver. The discharge will be applied to the Flood Modeller 1D model as a lateral inflow, in the same way as the HX link applies for the link to TUFLOW (2D); conversely, the X1DQ link (ii) will typically apply when the Flood Modeller 1D solver is discharging into the TUFLOW component, in the same way that the SX link applies for the link to TUFLOW (2D). The water level calculated by TUFLOW is applied as a dynamic head boundary (HTBDY) in the 1D solver.

Flood Modeller 1D solver and ESTRY nodes will be considered as linked if:

  1. A TUFLOW 1D (ESTRY) node in a 1d_nwk layer, and an 1D solver node in a ”Read GIS ISIS Nodes ==” or ”Read GIS ISIS Network ==” layer are snapped.

  2. By default, the link will be assumed to be an X1DH link; alternatively, to specify an X1DQ link instead, one should additionally set the 1d_nwk Conn_2D attribute (formerly called Topo_ID) to ”X1DQ” for the ESTRY node to complete the link. Note that the upstream and downstream Inverts for the node should be set to -99999 if there is not already a node (i.e. a new node is created for the purposes of the link). One can also set the Conn_2D attribute (formerly called Topo_ID) to ”X1DH” to reaffirm that the connection is an X1DH, although since this is the default behaviour, this is not mandatory, but may be used for clarification purposes.

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