I do not think this will accomplish what I am looking to do. I want to maintain 1D cross sections for the right overbank and channel portion of my channel and replace the left overbank (floodplain) with a 2D section to model the flow across the floodplain at a confluence. The water flows out of the one reach, across a floodplain, and enters the downstream reach after the two reaches are joined at a junction. I have bridges in my 1D model that I need to maintain, so I can not just replace the entire section of the reach with a 2D section. I have tried using a lateral structure, but it does not seem to work very well for my situation, so I was wondering if the remaining sections of the 1D cross sections could be directly connected to the 2D left floodplain without the use of a lateral structure.
A second option would be to replace the entire confluence area with a 2D model, but I do not see how to include bridge structures within a 2D area.