ISIS Quick Start Guide - Halcrow

ISISQuick Start Guide5) View the downstream boundary condition. Go back to the main ISIS user interface of the tidalmodel shown on Figure 2. Double click the HTBDY unit 3.38 (HTBDY is the ISIS shorthand for HeadTime BounDarY). Click the ‘Plot’ button of the dialogue that appears. It will show you the plot of thewater level–time series of the downstream boundary condition of the model in the TIDAL.DAT file. Thisplot is shown on Figure 5. You can see that the downstream boundary condition for this model is of atidal nature.Figure 5. Plot of the downstream boundary condition of the model in the TIDAL.DAT fileshowing a typical tidal time seriesWe can also view the upstream boundary condition using the same procedure, but choosing theupstream boundary condition node (2.1) – you will have to close the HTBDY data form first by clickingon its Cancel button. This boundary condition is represented by a constant flow of 100m 3 /s.6) View one of the cross sections. Double click one of the river section units (for example section2.12), click the ‘plot’ button of the dialogue that appears on the screen, then you should see the graphof a cross section on the screen. In the right hand side of the plot you can see the cross-sectionalprofile of the river with a flood wall on the right hand side and to the left of the river you can see a floodplain (250 m wide) with a steep hill on the left-hand side. Cancel the view of the cross section data.Do you have any questions or remarks? Please contact ISIS support at isis@halcrow.comor on 0845 094 7994 (+44 1793 845733 from outside the UK) www.halcrow.com/isis7