Run a 1D model

To run a 1D model in Flood Modeller, follow these steps:

  1. The guide uses example data that is packaged with Flood Modeller. To access the data, go to the Start tab and select the menu option (on the left-hand side) to “Extract example data”. Then specify the location you want to unpack these data to. Note you can unpack the example data multiple times to different specified locations (e.g. if you want to refresh the example files after using/editing them).

  2. Start Flood Modeller and on the Home tab of the main toolbar click 'Load 1D Network'.

    Browse to “…\Getting Started\1D Model”, select the Example1D.dat file and click 'Open' to load the model network into the interface.

    The model network should be automatically loaded into your map view, showing the river cross-sections and two boundary nodes.
  3. Load background map data. Different background data can be used depending on whether you have an internet connection available.

    If you are connected to the internet you can use freely available online base maps data. To add a base map into your Flood Modeller map view:

    If you do not have access to the internet (or your connection restricts downloading), you can load the background map image provided in the example folder:

  4. View the boundary conditions. The model is already provided with an upstream and downstream boundary. The upstream boundary provides a time series of flow entering the upstream end of the model network (in cubic meters per second). The downstream boundary provides a time series of water levels, which are influenced by the tidal cycle. To view the downstream boundary:
  5. View one of the cross sections. To do this, select one of the river section units (for example section 2.12), right click and select 'Cross Section' and click the “Plot” button. You should see the cross-sectional profile of the selected river node. Close the plot.

  6. Run the simulation. This can be done by clicking on the “New 1D Simulation” button in the 'Simulation Tab' of the main ribbon. You will be prompted to specify a name and location for saving your simulation file, for example ‘example1d’. A simulation run definition window will then appear, as shown below:

  7. Select 'Unsteady (Fixed Timestep)' as your run type, set the 'Finish time' to 36 hours and both the 'Timestep' and 'Save interval' to 360 seconds. Click 'Run' to start your simulation (click ‘Yes’ when prompted to save the changes you’ve made in the simulation window).

  8. During the simulation, progress information is displayed in a new window (this may take a few seconds to initially update to show your run data). When the simulation is complete (it should take less than a minute) the progress bar should turn green and show a value of 100% (if successful).

    You can review the summary data produced from your simulation in the chart and tables in the simulation window. Furthermore, you can change the plotted data to show a different performance metric by right-clicking on the chart and selecting from the displayed options, as shown below (note you can change this display during the run as well):

    After inspecting the simulation metadata, close both the run progress window (using the “X” icon in the upper right corner) and the run definition window (click 'Close' – there is no need to save your simulation settings).

  9. View the results.

    First let’s view the water level time series at one of the river sections. It should be a tide graph similar (but not identical) to the downstream boundary condition shown previously. To do this, select a river section (either on the map or in the Network panel, for example node 2.26), right-click and select 'Time Series' from the displayed options. A new window is displayed which enables you to specify a results file, a node from the associated network, a start- and end-time and a parameter to plot. Leave all settings to their defaults and click the 'Plot' button. The water level (stage) result at the node you selected will be plotted, as shown below (close the plot once you have looked at it).

    Next, watch a dynamic animation of the changes in water level with time on a longitudinal profile of the river. To do this: