Alignment lines

The purpose of using alignment lines is to use geo-referenced polylines, e.g. describing river banks, to update information in the cross sections. Alignment lines will affect the simulation results only when alignment lines positions are transferred to the cross sections, and such transfer must be triggered by the user using the 'Trim or extend cross sections' tool available in the 'Tools' menu.

Transferring alignment line information will update the positions of markers in the cross sections as described below:

·         Marker 1 will be placed at intersection with left extent alignment line

·         Marker 4 will be placed at intersection with left bank alignment line

·         Marker 5 will be placed at intersection with right bank alignment line

·         Marker 3 will be placed at intersection with right extent alignment line.

Alignment lines can intersect multiple cross sections.

Alignment lines can only be created from the Map view. Select the 'Spatial data' tab and then choose 'Alignment line' from the 'Type' drop-down menu. The ribbon menu then allows you to:

Select. Select a line on the map and synchronize the selection with the tabu­lar view.

Add. Add a line to the map. This is done in the same way as branches are inserted, but without connecting to any existing element in the map.

Edit. Edit vertices, in a similar way to what the command does for a branch.

Cut. Removes segment between closest vertices. Both lines keep the same type as the original line. The first line also keeps the name. The second line is given the same name as the first with a prefix of "_2".

Merge. Inserts segment between two lines. The name and type of the new line is the same as the first line selected (click the 'Merge' button, then select one line's end and drag the mouse to the second).

Delete. Delete the entire line.

Alignment lines menu

The lower part of the dialogue window contains a list of all alignment lines in the river network. Alignment lines can be deleted from the list using the Delete '-' button above the table.

Select an alignment line from the list and specify the properties below.

Location

Name. Name of the alignment line.

Type. The following list of types of alignment lines is available:

·         Left and Right bank: these locations indicate the left and right levees, corresponding to the limits of the river bed.

·         Left and right extent: location of the left and right extent of the full cross section, including the flood plains if existing.