1D-2D Flood Modeller-TUFLOW: Difference between revisions

Once the water level in Flood Modeller exceeds the elevation in the boundary cell, water can enter or leave the model. Similar to a Flood Modeller lateral spill or lateral inflow, the discharge is distributed laterally along the length of the HX line. Note that it is the elevation of the HX boundary cell centres that determines when the spill starts to occur and not the cross section within Flood Modeller. If there is a levee or flood defence, it is important that we use breaklines in the model to ensure that the elevations of the 2D cells are consistent with the levee crest. The next four images show a section view of the 1D/2D link and how this may progress during a flood event.<br>

Often HX lines are located along the top of aan leveeembankment (natural or artificial) or flood defence running along the river bank. When carving a 1D channel through a 2D domain, the HX line must be either on the top of the leveeembankment or on the inside of the leveeembankment (closest to the channel). If the HX line is located on the other side of the leveeembankment away from the channel, the effect of the leveeembankment on water flow is <u>'''not'''</u> modelled. In the image above, it can be seen that the boundary cell is along the leveeembankment and the interaction between the channel and the floodplain (1D and 2D) occurs at the correct elevation. <br>