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Module D-Flow 1D: All about the modeling process
Interpolation across nodes
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By default, the characteristics (cross section, bed level and roughness) of a branch are not
interpolated across a connection node. Instead, the waterlevel and discharge are transfered
from one branch to the next. In case of a single river or channel this might lead to unrealistic
and undesired flow.
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4.3.2.3
Figure 4.12: Two branches with different Order number: No interpolation across the connection node
To avoid this the Order number of branches is introduced. Cross sections, bed level and
roughnesses are interpolated across a connection node when the branches have the same
Order number. By specifying the same Order number for branches of the main river, a tributary can be distinguished by a different Order number. The characteristics of the main river
will be interpolated, resulting in a smooth flow. This can be achieved as follows:
Press the Esc key
Select the first branch by a left-click on the map
Hold the Ctrl key while selecting the next one; or
Hold the Shift key while selecting another branch: the shortest route will be selected
(the selection will be high-lighted)
While holding the Ctrl key, a left-click will de-select a branch
Now the user can modify the Order number of all selected branches in the Properties window.
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