FM Tute M01 MI 1D2D Links

Introduction

In this section we will create the 1D/2D links to link the Flood Modeller 1D component to the TUFLOW 2D domain. As described on the previous page, this consists of a 1D/2D link with type "HX" and a series of connection lines that connect the 1D computation points to the HX line. For this tutorial the HX lines and a sample of the "CN" lines have been provided.

Method

1. Import in an empty 2d_bc_empty.TAB layer from within the TUFLOW\model\mi\empty folder and save as 2d_bc_hxi_FMT_001.TAB
2. Open the 1D_2D_HX_Links.TAB GIS layer from Module_Data\Module_01\mi folder. Select all objects from within this layer, copy and paste into 2d_bc_hxi_FMT_001.TAB.
3. Interrogate one of the lines running along the banks of the watercourse. These lines are the 1D/2D boundary links and have been assigned a type ‘HX’.
4. Interrogate one of the lines connecting the x1D node to the HX line. These are the connection or ‘CN’ lines that read the water level from Flood Modeller and transfers this to the HX line.
5. Note that where there are junctions within the Flood Modeller 1D model (i.e. at structures), both the upstream and downstream nodes are connected to TUFLOW and the HX line broken between the nodes. This is a requirement of a linked Flood Modeller – TUFLOW model.
6. Digitise the missing CN and HX lines between nodes XX and XX.
7. Save the file and export into .MIF / .MID format for import into TUFLOW.

The digitised direction of the HX and CN lines is not important. The CN lines however should be digitised approximately perpendicular to the direction of flow. Two CN lines are digitised for each node and connected to the HX boundary lines along the left and right banks. The HX boundary lines should be digitised along the top of each bank such that the width between the lines approximately correlates to the width of the 1D channel.

Please return to the Flood Modeller Tutorial Model module 1 page here.