HECRAS meandering stream: XS/cutlines intersect
HECRAS meandering stream: XS/cutlines intersect
(OP)
Dear forum members,
I am a newbie in working with HECRAS and I would be happy to hear your advise.
Please find a picture of the situation attached and here is my problem:
The stream is non perennial, only 1-2 m wide and strongly meandering. I have now created cross sections 200m wide at an interval of 100m.
My questions are now:
Is the interval of 100m too coarse (I think so)
Does the whole cross section have to be perpendicular to the flow? Or can I make cross sections that are perpendicular to the flow only in the area of the channel and then the cross section deviates (snaps off) so that they do not intersect with each other?
What would you propose how to handle the intersecting cross sections?
Thank you very much for your help!
I am a newbie in working with HECRAS and I would be happy to hear your advise.
Please find a picture of the situation attached and here is my problem:
The stream is non perennial, only 1-2 m wide and strongly meandering. I have now created cross sections 200m wide at an interval of 100m.
My questions are now:
Is the interval of 100m too coarse (I think so)
Does the whole cross section have to be perpendicular to the flow? Or can I make cross sections that are perpendicular to the flow only in the area of the channel and then the cross section deviates (snaps off) so that they do not intersect with each other?
What would you propose how to handle the intersecting cross sections?
Thank you very much for your help!





RE: HECRAS meandering stream: XS/cutlines intersect
RE: HECRAS meandering stream: XS/cutlines intersect
RE: HECRAS meandering stream: XS/cutlines intersect
Robert Billings
www.newrivereng.com
RE: HECRAS meandering stream: XS/cutlines intersect
RE: HECRAS meandering stream: XS/cutlines intersect
Robert Billings
www.newrivereng.com
RE: HECRAS meandering stream: XS/cutlines intersect
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It will be an iterative process.
RE: HECRAS meandering stream: XS/cutlines intersect
There seems to be no rhyme or reason for the cross-section locations you have cut. When I have a meandering stream, I cut my sections through areas where the channel banks are parallel to the center of gravity flow direction and use my channel Manning's to reflect the meandering channel. Be aware that if your channel flips from left to right in your overbanks, it will not give you a great model. HEC-RAS divides flow up into channel and left/right overbank flow. When there is a large change in conveyance from one cross-section to another you get a lot of errors and conservative results.
RE: HECRAS meandering stream: XS/cutlines intersect