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Why does the calculation produce this error? How to solve?

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Start the Simulation...

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=> ERROR <=
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Cross Section # 1 is dry.

Except if you're using the steady computation kernel, you should give an initial water level which ensure there is water in all computation section
In your case it seems there is no water at section 1 so the computation cannot be done as you probably choose another computation kernel...

thank you!but i use the unsteady subcritical flow

That's what I said!
How did you define the initial water level?

Thanks for the reply, my settings are as follows：

My initial water level is higher than the river bottom elevation, but there are still calculation errors:Cross Section # 1 is dry.



these are all the files of my project. Can you help me answer this question?Thanks！

Hi
This is not really the initial value which is the problem but probably more the settings of the model.
Try to reduce the time step. I tested 60s instead 3600s and the error occur on section 29 instead of 1
I would also advise you to change the mesh by adding intermediate cross sections
At least in the initial solution the discharge is equal to 0 and you impose 8 m3/s so change the initial discharge

Hope this helps