Changing out river geometries in RAS Mapper

[Kathleen]

Hi,
I am trying to change out the current centerline/banklines/flowpaths with a different condition, but within the same model. I am keeping the cross sections the same and just importing shapefiles for the centerline/banklines/flowpaths of the alternative conditions. I then update the bank stations and manually edit the cross section geometries to show the changes in the channel location. I have a few questions pertaining to this.

1. Has anyone done something similar and have tips/studies/papers they can share?
2. I am having an issue where a random “river” appears coming from a cross section in the middle part of one of my rivers. I did not put it there and it is just a straight line coming out from the cross section, but not intersecting my river. Every time I edit the geometry to delete it, it reappears once I save the geometry. Any ideas on why this is happening and how to get rid of it?
3. My river stationing changes a bit due to the river lengths changing among different conditions, however, I would like to keep the stations the same as the initial conditions for visualization and comparison purposes. Therefore, I don’t compute updated river stationing in RAS mapper. However, every so often a cross section will rename itself to a random number, like 1. Or, it will rename starting from an arbitrary number and each cross section after will be one more than before. Is there a way to prevent this from happening?

[Anonymous]

I have not tried to do exactly what you are doing. But I have had success in the past, when I wanted to break apart and or combine geometries using the geometric importer.

I usually save the model with a new project name delete as appropriate and then import from the original geometry file as appropriate.

I have seen the issue with river stations. If you have two different versions, the original and the new, you can go back to the old one. From the geometry editor, list the river stations in a table view and then copy them to the clipboard and paste into the new.

This approach can also have issues. Check to make sure cross sections around bridges are correct and check to make sure the cross sections associated with lateral structures are correct.

The GIS referencing has generally made things better but when things are wrong it has gotten harder to do manual fixes.

Good luck.

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