Author Topic: 1D-2D coupling  (Read 361 times)

a30110

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1D-2D coupling
« on: October 08, 2019, 04:49:46 am »
Hi All,

I am working on 1D-2D coupled flood model using MIKE Flood.
So far, I have been modeling rainfall using the runoff model in the MIKE11 and the overflow from the MIKE11 flow to the MIKE21. In this case, it seems that only the place with the drainage network linked areas is flooded.
If you have very detailed drainage lines, this won't be a problem, but in practice, there are limits to building all the pipes into the model.
It's a little dilemma here, is it reasonable to give rainfall information only to 1D model or to 2D model?
It seems whether the chicken first or egg first? I would like to hear a reasonable opinion on this.

Thank you for your help in advance.
Kevin.

Sebastian

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Re: 1D-2D coupling
« Reply #1 on: October 25, 2019, 09:14:10 am »
Hey Kevin,

I'm not sure, if i understand your question correctly. Anyway so in MIKE11 you have your sewer network and that is coupled to the MIKE21 2D surface model? A common practice, in case of heavy rain events would be applying precipitation to the 1D and the 2D model. What you can do is only 'connect' the precipitation that corresponds to the roof areas to your 1D model and apply the precipitation for all other areas in the 2D model (minus the amout from the roof areas). In MIKE21 you can achieve this by using a dfs2 or dfsu-File as Precipitation input (Constant in time, varying in domain); only necessary if your buildings roofs/footprints are part of the mesh and not excluded from the mesh.

Hope this helps!

Greetings
Sebastian
« Last Edit: October 25, 2019, 09:33:50 am by Sebastian »

a30110

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Re: 1D-2D coupling
« Reply #2 on: November 18, 2019, 07:45:57 am »
Hi Sebastian,

Thanks much for the information. I can try the method you explained!!

Best regards,
Kevin.