The software can generate cross section plots of the HEC‑RAS steady flow and unsteady flow computational results, displaying the water surface elevation, energy gradeline elevation, critical depth elevation, as well as a velocity distribution plot on the cross section. In addition, the cross section plots can be printed and exported to AutoCAD.
See this section for additional cross section plot options.
Displaying Cross Section Plots
To display the analysis output results in a cross section plot, select Results | Cross Section from the ribbon menu.
Selecting this menu command will display the HEC‑RAS analysis results in a cross section plot.
Selecting Profiles to Plot
To change what profile should be displayed on the cross section plot, select Options | Profiles from the menu. The software will display the Select Profiles dialog box where the user can select the profiles to plot.
Cross Section Variables
To change the variables to be displayed on the cross section plot, select Options | Variables from the menu. The software will display the Select Variables dialog box where the user can select the variables to plot.
Plotting a Velocity Distribution
In order to plot a velocity distribution on the cross section, the appropriate input data must be defined for computing a velocity distribution for each of the cross sections.
See this section on how to define the input data for computing a velocity distribution.
If a velocity distribution computation has been performed, select Options | Velocity Distribution from the menu. The software will display the Velocity Distribution Options dialog box.
Select the checkbox option Plot Velocity Distribution in the displayed dialog box and then click the [OK] button. The velocity distribution will be shown on the cross section plot.
Navigating Between Cross Sections
The user can navigate between cross sections using the river reach and cross section navigation controls at the top of the Cross Section plot window. The user can select the river, reach, and cross section of interest. To move to the next downstream cross section, click the [↓] button. To move upstream, click the [↑] button.
Animating Cross Section Plots
For unsteady flow models, the cross section plots can be animated to show how the water surface changes over time as the flow progresses downstream. To animate the cross section plot results, select Options | Animate from the menu. The Animation Control dialog box will be displayed.
To adjust the playback speed of the animation, click on the […] button. The lower half of the Animation Control dialog box will extend downward to show a playback speed control slider.
The playback speed control slider adjusts the speed of the animation playback. To slow down the animation, move the slider to the right. To speed up the animation, move the slider to the left.
Printing Cross Section Plots
The cross section plots can be printed with one or more cross sections per page. To print a single current cross section, select File | Print from the menu. To print out all or selected cross sections on multiple sheets of paper, select File | Print Multiple from the menu. The Multiple Location Print – Select Locations dialog box will be displayed.
From the displayed dialog box the user can select which cross sections to be printed, as well as how many cross sections should be printed per single sheet.
Exporting Cross Section Plots to AutoCAD
The cross section plots can be exported to AutoCAD. To export all or selected cross sections to AutoCAD, select File | Write DXF File from the menu. The Multiple Location Print – Select Locations dialog box will be displayed.
From the displayed dialog box the user can select which cross sections to be exported.