Creating a 1D Semicircular Flume in HEC-RAS: Non-Newtonian Flume Series (Part 1)

[@stanfordgibson]

I've gotten more requests for info on how to build a rectangular flume - which is more common than a half pipe - we have a tutorial on that in our documentation: www.hec.usace.army.mil/confluence/rasdocs/hgt/latest/guides/creating-a-terrain-dataset-to-model-a-flume-experiment

[@lainegferreira]

Dear Stanford Gibson,
I am unable to do the same for a rectangular channel. After elaborating the 2D mesh and checking the cross section, the rectangular section drawn by me does not appear. I believe my problem is with GIS TOOLS. Thank you very much for the video teachings.

[@stanfordgibson]

Try resetting plot extents. There is nothing about the semi-circle that should affect georeferncing. see video 8:51

[@stanfordgibson]

One weird thing about rectangular flumes is that it will be difficult to set bank stations to the top of the flume if the walls are straight. I usually put a very small slope on my sidewalls for rectangular flumes.

[@lainegferreira]

@@stanfordgibson Dear Stanford Gibson,
My result, in RAS MAPPER, is a linear relation between ELEVATION and STATION (diagonal passing pass the origin). Is it possible that HEC-RAS 6.0 version shows different result in RAS MAPPER PLOT? Because my upstream and downstream cross sections are correct (sections are rectangular) but between upstream and downstream it appears as diagonal (not a rectangular section like it should). Thank you very much!

[@stanfordgibson]

@@lainegferreira Rectangular interpolation can get tricky in Mapper because of the vertical walls. Try interpolating the cross sections in your 1d model first to give Mapper more to work with. Then you could reach out to me on LinkedIn or ResearchGate and I can look at it.

[@pradeepsaraswa7028]

Hi La, Are you by any chance from Swansea University cause I have the same problem as you have if so please contact me.