Flood Modeller Tutorial Module01 Provisional: Difference between revisions
Content deleted Content added
Line 1:
In this module we will link an existing 2D TUFLOW domain to an existing Flood Modeller 1D model. The TUFLOW 2D domain will represent the floodplain in the study area, and the 1D Flood Modeller model will represent the watercourse and all online, in-channel structures.
Line 5:
The main watercourse channel within the existing 2D model is not very well represented using the 5m 2D cell size. In parts, the watercourse is only 5-10m wide and the 5m cell size could be considered too coarse to accurately represent the watercourse topography.<br>
[[file:Poor_2d_rep.png|400px]]<br>Using a cell size that is coarse relative to the width of the watercourse channel may reduce the accuracy of the conveyance in the channel. There are a number of options for improving the representation of the creek channel:▼
* decrease the width of the 2D cells, either globally or using Quadtree
▲Using a cell size that is coarse relative to the width of the watercourse channel may reduce the accuracy of the conveyance in the channel. There are a number of options for improving the representation of the creek channel:
▲* decrease the width of the 2D cells, either globally or using Quadtree ; and/or use sub-grid sampling, and or,
* model the channel as a 1D network, dynamically linked to the 2D domain (the floodplain).
In this module we will adopt the final approach of modelling the creek as 1D elements using Flood Modeller.
Line 14 ⟶ 13:
Setting up a 1D/2D model where the 1D channel cuts through the 2D domain is probably the most time-consuming type of a model to setup. For this module, the complete Flood Modeller 1D model has been provided, to allow for progressing through the module in a relatively short period of time.
This tutorial builds upon the 2D TUFLOW domain that was constructed as part of [[Tutorial_M01 |Module 1]] and [[Tutorial_M02 |Module 2]] of the TUFLOW Tutorial Model.
Line 25 ⟶ 24:
*1D/2D boundary links to connect the 1D ESTRY culverts to the 2D TUFLOW domain.
The steps necessary to modify each of the GIS inputs are demonstrated in QGIS using SHP and GPKG formats. If you would like to view instructions for the tutorial in ArcGIS or MapInfo these can be found on the archive page for[[Flood_Modeller_Tutorial_Module01_Archive | Tutorial Module 01]].
Line 60 ⟶ 59:
Now that we have made all of the necessary changes to the input GIS layers, we need to update the TUFLOW control files and Flood Modeller Simulation Files to create a linked model.
We will first update the TUFLOW Geometry Control (TGC) file. The following changes have been changes made to the geometry:
Line 106 ⟶ 103:
</ol>
<br>We will now update the TUFLOW Boundary Condition control file (tbc) to reference the model boundary files created in previous steps. <br>
| |||