Model as Steady, Unsteady or 2D

[m@nation]

Good Afternoon,

I am modelling 3 river reaches side by side in a very flat area. The issue is that they are so close to each other that I cannot extend my cross sections without getting vertical walls (I believe this would mean i would be overestimating my depth). Would I be able to still model this in steady or would unsteady or 2D modelling be better? Thanks!

[Toby]

Try using lateral structures which link the ends of the cross sections. Use a tailwater connection type of Cross Sections of a river reach. Have the cross sections end in one reach where the cross section from the other reach starts. Or if you can go 2D.

[m@nation]

Thanks for the suggestion! One thing I just still don’t understand is how the water gets accounted for between the 2 river reaches. Since I cannot extend the cross sections in the middle part between the 2 reaches without crossing each others flow paths, both of my cross sections have vertical walls. If I add a levee, what will that do? How will this help with determining the depth in the “middle section.”

Thanks!

[cameron]

If you have lateral structures between each reach then the flow will be able to go from one reach to the next.

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