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Hello Community,

I have the Telemac Version v7p2, but I can't find the keyword rain and evaporation mm/h in the fudaa Version
- Fudaa-Prepro-1.3.0RC7- just the keyword rain and evaporation in mm/D
Do I have to program it on my own in the steering file by adding for example [DURATION OF RAIN OR EVAPORATION IN HOURS = 6.]
Or is there any other Fudaa Version available which contains this keyword?
My problem is that I want to simulate an extreme rainfall varying in time [Duration of the rainfall for example 20min]
Therefore I want to give each minute of time another intensity of rain [mm/min].
time in min mm
0 0
1 8
2 9 and so on

Anybody has a suggestion to fix this as easy as possible?

Hi
First of all it will be better if you upgrade your version to the latest one
Secondly, FUDAA didn't evolved since few years so the dictionary of the latest version are not available...
If you want a fine tune of the rain, you could look at the example pluie...

Regards

Hi,

As Christophe pointed out you can look at the test case pluie. There are 3 different examples provided, one of them being a user defined hyetograph read from a formatted data file, ie. very similar to what you want to do. Have also a look at the comments in runoff_scs_cn.f to understand how does the data file is to be defined.

Best regards
PL

Hi everyone,

I am trying to simulate simultaneous rainfall and flood. I looked test case pluie and the Pierre-Louis paper about "Implementation of a rainfall-runoff model in TELEMAC-2D".

I tried to reproduce the third example, including CN in the geometry file. If the simulation runs, it seems that it doesn't take into account CN coefficients and rainfall.

You could find my files to the following link:
wetransfer.com/downloads/9dbc9d4c7ac8e75...0190425173827/842ee1

Hoping that someone can help me.

Regards,

Nicolas

Hi,

You actually forgot to activate the rain option! Add following keyword and everything should work:

PLUIE OU EVAPORATION = OUI

A couple of remarks:
- you excluded buildings from your mesh which means that you actually reduce the catchment area (is it correct?)
- you have stored variables (water depth, etc) in your mesh file that should not be there. If you want to use it as hotstart then put them in a restart file (as you did with condInit.ser)
- i ran your model for a few time steps and you get negative water depths (-0,06 m). Check your numerical set-up.
- i did not check the model set-up in depth, neither the geometry, but for rainfall modelling it is better to use finite volumes since the method is better suited to handle small water depths than finite elements (default). FV are slower than FE though, but scheme 5 (HLLC) performs rather well for small scale problem like your case.

Good luck!

Kind regards
PL

Hi Pierre-Louis,

Thank you for your quick answer. It was a quite stupid oversight.

I often use an existing cas files to configure Telemac simulations. Usually I check inflow/outflow but I am not an expert in numerical set-up.

So, what do you advise to check numerical set-up and the computation results?

Regards,

Nicolas

Hi,

Sorry for the late reply, I have been out of office for a while.
With FE, I found that the following numerical options give good results (better mass balance, only positive depths):

TYPE OF ADVECTION = 14;5;14;14
OPTION FOR THE TREATMENT OF TIDAL FLATS = 1
TREATMENT OF NEGATIVE DEPTHS = 2

Have a look at the manual for more detailed explanations.

For FV, start by adding the following keywords:

VARIABLE TIME-STEP = YES
DESIRED COURANT NUMBER = 0.8
EQUATIONS = 'SAINT-VENANT VF'
FINITE VOLUME SCHEME = 5

The main part of the keywords related to numerical settings are actually used by FE only and are therefore overlooked when using FV. Results using the above FV set-up are good according to my experience.

Good luck!

Kind regards
PL