open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,

I'm doing rainfall-runoff modeling and have an inundation map for a certain time period. I extracted the temporal maximum with tools -> extract surfaces. How do I know the timestep from which the temporal maximum is extracted?

Thank you!

Let's assume you are extracting the maximum surface over a multi-frame grid object to help clarify the discussion (for me).

Extracting the maximum surface from a multi-frame object, where each frame is a grid of values, means that the resulting surface grid will be such that each node will be the maximum value across all frames being used. And each node's maximum may come from any one of the frames.

Ok... so, I'm sure you know all that.

So, to be clear... you're looking for a surface where each value is the index of the maximum across the frames. Is that right? What would you like to do with such a surface grid of frame index values (rather than a surface grid of the actual maximums)? Just curious

Kindly,
Alan

And... if the there are ties (i.e. more than one frame has the maximum value), what would you like to have as the maximum index surface?

Kindly,
Alan

Thanks for the reply!
Well, i thought the temporal maximum shows me the timestep, where the inundation is at it's maximum.
But it shows me the maximum value for each node at different timesteps. For example node 1 has its maximum value at 30 min and node 2 its maximum value at 60 min. Then the temporal maximum would show me the values at different timesteps right?

It sounds like you're NOT looking for the maximum surface across multiple frames. It sounds like you're looking for a PARTICULAR frame with certain properties. e.g. one of your frames that has the most number of values within a certain band... or something else. Perhaps you can describe the property or properties that you're looking for?

And/or including a simple example data file might help me see more clearly...

Kindly,
Alan

You're right, I'm looking for a particular frame with certain properties.
I'm modeling the water depth for a certain period of time. The rainfall starts at 0 min and goes on for 60 min. During this time the area starts to fill up with water. I let the simulation run for 3h to see, how the water depth developes. Depressions in the surface can cause the water to flow around after the 60 min.
I was wondering, when the mean maximum water level is reached.
Or other question: Is there any way to find out at which time the maximum water level was reached at each node when I'm using the multiple frame apporach?

Hello,

Just ask for TMXZ in the 2D graphic variables, you will get what you want (time of max elevation at each node):

'TMXZ="time of maximum elevation (s)"'

You can of course add MAXZ which will give you the same result than the BK post-processing (but with more accurancy since this analyzes all time steps, no just the ones printed out in the results file).

'MAXZ="maximum elevation (m)"'

Hope it helps

Kind regards
PL

Hi!
Yes, i think that's what I'm looking for. That's really helpful
Just to check my understanding of the variables:

• TMXZ shows me the time at which the highest water level is reached. When I animate it some parts change until the end, meaning the maybe reach the highest water level after the simulated time period
• MAXZ gives the maximum elevation at each time step. I don't see the difference to the usual water water depth variable. Can you explain it to me please?

Thank you!

Hi!

TMXZ seems to behave as expected in your description.
MAXZ should give you evolution of max FREE SURFACE (not water depth!). The values should keep increasing until the maximum is reached, and keeping the max value until the end of the simulation.

I haven't used this in a while now but it worked fine when I did use it or the last time. It is a basic feature so there should not be any issue with it.

Kind regards
PL