Accessing and Viewing Results

The basic Water Quality output consists of the concentration or value of pollutants and modelled variables at all nodes in the model. Processing of the results is undertaken in the same way as for Flood Modeller 1D Solver and is therefore covered by the Flood Modeller manual.

For unsteady runs results are written to the unsteady concentration output file (filename extension '.zzc'). Only the results at the saved interval are available for graphical and tabular processing.

In order to minimise the size of the output file a binary format is used and therefore the file cannot be inspected directly. Two methods for processing the binary file are available: tabular and graphics output.

The time varying results of the mobile bed run are written to the binary file 'filename.zzc'. The results can be processed using the TabularCSV output, as shown in Figure 1. Make sure you select the appropriate file type from the drop down menu, 1D Water Quality Results (*.zzc).

Figure 1. Opening the water quality results file 'filename.zze' using the TabularCSV output.

TabularCSV output supplies output in Comma Separated Variable (CSV) format for easy access and further manipulation in spreadsheet packages, such as Microsoft Excel. The TabularCSV is accessed from the Network Properties Window, under the menu Tools.

Once you have selected the appropriate results file, as explained above, the TabularCSV tool will allow you to write results for all nodes at a specified time in initial conditions format for use as initial conditions for subsequent runs.

The output options are (1) Simulation Results - output at selected time intervals at all or selected nodes, (2) Maxima and minima of all or a single variable at all or selected nodes, (3) Extract new boundary conditions, (4) Initial Conditions output. Make sure you select the output of your choice in the Output Parameters Tab of the TabularCSV window, as shown in the left hand side of Figure 2.

Figure 2. TabularCSV window and available water quality results.

The output options can be applied to the following results, which are available for inspection:

• Conservative Pollutant
• Temperature
• Dissolved Oxygen
• Fast BOD
• Slow BOD
• Fast Nitrogen
• Slow Nitrogen
• Ammoniacal Nitrogen
• Nitrite-n
• Nitrate-n

Flood Modeller can produce several plots of results including cross sections, long sections, time series and XY series. Descriptions of how to produce these plots are given in the Flood Modeller manual. 1D Water Quality Solver results can be plotted alongside 1D Solver results in the normal fashion, by right clicking on the plot screen, selecting 'Add Series' and 'Unsteady Results (this model)' (Figure 3).

Figure 3. 1D Solver and 1D Water Quality Solver plot screen.

'Conservative Pollutant', in this case (or any other variable which has been modelled in 1D Water Quality Solver), can then be selected from the drop down menu (Figure 4). 1D Water Quality Solver results are then plotted along with the 1D Solver results (Figure 5).

Figure 4. Selection of the 1D Solver and 1D Solver Water Quality results for plotting.

Figure 5. A long section plot showing 1D Solver (Elevation) and 1D Solver Water Quality Solver (Pollutant Concentration) results.