Guest Chris Nielsen Posted March 7, 2014 I have a model mesh which has a road traversing a floodplain. What is the best way to include this in my model? Should I use a weir? Quote Share this post Link to post Share on other sites
Guest Chris Nielsen Posted March 7, 2014 As a first approach, the road alignment could be directly inserted into the model geometry using a "cell elevation polyline" command. All you need is a csv file with the x,y,z coordinates of the road alignment (and, optionally, an ID column). This command will then set bed elevations for cells that are intersected by a polyline, interpolating cell z values from the z values specified at vertices along the polyline. This is a very handy tool and ensures that the road crest is preserved in the model geometry. The same approach can be applied to including a low flow / drain into TUFLOW FV. The syntax for this approach in the fvc file is (assuming the input polyline file is roadalignment.csv, which has 4 columns with X,Y,Z,ID, and the road alignment of concern is ID=100): cell elevation polyline == roadalignment.csv,100 Alternatively, you could represent the road as a weir. To do this, you could use the same input csv file of the road alignment, but apply a "nodestring polyline" command. This command will create a nodestring that best follows the x,y coordinates of the road alignment. Then, using the weir_dz structure type, the road alignment is simulated using a weir. The syntax for this approach is as follows: nodestring polyline == roadalignment.csv,100 structure == nodestring, 100 flux function == weir_dz end structure Which approach to choose? I guess this depends upon how important it is to accurately simulate flow over this road. See the following post for further discussion on this aspect. Quote Share this post Link to post Share on other sites