[anthony]

Thank you

Let’s say you have already built a 1D RAS model, and it extends across the floodplain. You can draw 2D flow areas on top of the 1D floodplains, without having to rebuild your 1D model. Use the “Next to bank station” headwater position for this situation and draw the 2D area to match your bank lines or bank points (the edge of the main channel).

Thank you for your answer. However, in the case 1 presented in the citation, the 1D calculation is done on the entire profile or not, even if we defined the 2D at the top of the bank?

[anthony]

Ok thank you Scott. I’m on the right way.

Another question please.

I am currently building a basic model to understand what HECRAS does with connections.

The HW position field is useless, no ? Or I don’t understand what hecras does with… I explain.

In my basic model, I deliberately drew large cross profiles in my 2D zones to see the influence of this field.

I tried “Right Overbank” and “Next to right bank station” (the same thing for the left side).The results are similar.

For me, I understand it that way :

However, from results, the connection still seems to be at the lateral structure. So what is the use of the HW position field please ?

How does it manage the superposition of 1D and 2D? I thought the “HW positions” field was used to define where the user wanted to overwrite 1D data by 2D as under MIKE (DHI) where a marker is used to define the location of the 1D/2D link.

Anthony

[anthony]

Thank you Scott. I had already read some of these articles.

I try currently to cut my laterals structures in several sections. Do we have to leave a “hole” between every section of lateral structure to have no problem of junction ?

I will also tried to increase my tolerance. Thank you of your advice(councils). I would make an experience feedback.

Anthony

[anthony]

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I didn’t still solve my problem. I try currently to cut my laterals structures in several …

Do you have an idea please ?

Thank you,

Anthony

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