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Hi,

the grain sizes and fractions are specified in the cas file for Sisyphe. The key words are explained in the Sisyphe manual.
It is better so start your model with single grain size and when it is working accurately, adapt the model to multiple grain sizes.
If you like to implement a spatial distribution of the grain sizes, this can be done with BlueKenue but requires a Fortran subroutine. If you are new in Telemac, it is better to start with a simplified model.

Regards,
Gabi

Hello,

I'm working on a simulation of a river, where downstream of spillway gates has an area of riprap, I have also simulated with different diameters but I wonder if anyone has any idea how to simulate with different particle sizes, for example the river has a "grain 1" and riprap zone has a "grain 2". Attached picture of what I'm going to simulate.

Regards.

Hi

Please take time to have a look into the other post, the same subject was discussed yesterday on another topic:
http://www.opentelemac.org/index.php/kunena/16-telemac-2d/8333-sediment-distribution#19477

And as Gabi wrote, start with a single grain and upgrade your model progressively.

regards

Hi,

do you need different grain sizes or just different roughness values? Will the stones on the riprap move at any case?

Regards,
Gabi

Hello,

I need to simulate different particle sizes in different areas, the roughness is no problem. The stones on the riprap should erode by the high speeds.

I have a CAS sisyphe where sediments with different diameters throughout the study area, but I need to look at two areas with different grain

Do you have any idea how to perform the CAS sisyphe?

Look at te picture.

Regards,
Manuel

Hi,

the cas file does not change, you have to implement the distribution of the size classes by giving a Fortran file.

Take a look at post


www.opentelemac.org/index.php/kunena/16-...ediment-distribution

Regards,
Gabi

Hi,

As Gabi mentioned, please look at this thread where I added a comment on a new functionality available from version 7.1 which makes the use of spatially defined user variables more easy.

A comment about your original question: I might be wrong, but I don't think that the available sediment transport formulas will give reliable results when simulating rip rap. The basic bed-load formulas have a range of validity in terms of median diameter up to a few mm / cm. It should however be possible to assess the erosion potential by looking at the skin friction, based on the local mean diameter value (to be defined in init_compo.f, see the thread that Gabi mentioned).

Good luck!

Best regards
PL

Hello

I apologize, but someone will have an example of Fortran files?

Thanks,

Regards

Manuel Chinga

Hi,

all subroutines are stored on your own PC in the Telemac Folder, e.g. for telemac2d it will be somewhere like this: C:\...\v7p1r0\sources\telemac2d

If you have just the two grain sizes, using the "user variables" like pilou1253 mentioned in the other post would be the easiest way.

And I think you should think about the comment of pilou1253 about the sediment transport formulas and their application range...

If you are working with sediment, you can take a look at the Sisyphe topics in the forum.

Regards,
Gabi

Hello Manuel,

I send you an example of a fortran file which takes into account zones with different grain sizes.

The geometry file includes a new variable called "ZONAS"(private variable 1). Each value of this variable (1,2 and 3, in the example) defines a different region with a particular initial combination of grain sizes.

The sisyphe .cas file considers 2 mean diameters of 0.0001 and 0.0003m.
Zone 1 has a 100% of 0.0001m and 0% of 0.0003m
Zone 2 has a 0% of 0.0001m and 100% of 0.0003m
Zone 3 has a 50% of 0.0001m and 50% of 0.0003m
As you can see in the fortran file

Regards,

Martín