open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,

I have a cloud of (x,y,z) bathymetry points created in the Geographic System OSGB1936.

I have created my mesh in Blue Kenue and mapped this bathymetry on to the mesh. My question is do I need to manipulate the mesh or bathymetry points in any way to use the TPXO tidal data in conjunction with one of the Geographic System options in Telemac?

Thanks,

Tom

Just some further info. The geographic location of the study is the Scottish coast (UTM30) and I am using the European Shelf tidal data of TPXO.

Hello Tom,

If you can, convert the coordinates of the GEOMETRY FILE into UTM North 30.
To use the European Shelf tidal solution, you only need to specify in the steering file:
- GEOGRAPHIC SYSTEM = 2 (i.e. UTM North),
- ZONE NUMBER IN GEOGRAPHIC SYSTEM = 30 (UTM zone number = 30).

Hope this helps,

Chi-Tuan

Thank you Chi-Tuan, I will certainly try this using QGIS.

Regards,

Tom

Hi Chi-Tuan et al,

I've managed to resolve the tidal boundary conditions but am still struggling to input a river into the system. I have added a flowrate boundary for the river (4 5 5) and wish to use the LIQUID BOUNDARIES FILE (attached). This give the following error:

================================================================================
ITERATION 0 TIME: 0.0000 S
TELEMAC2D INITIALIZED
THE LIQUID BOUNDARIES FILE CONTAINS

---

MPI_ABORT was invoked on rank 1 in communicator MPI_COMM_WORLD
with errorcode 2.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.

---

3 LINES WITH:
Q(1) Q(2) Q(3)

SL: MORE PRESCRIBED ELEVATIONS ARE REQUIRED
IN THE PARAMETER FILE
AT LEAST 3 MUST BE GIVEN

PLANTE: PROGRAM STOPPED AFTER AN ERROR

///////////////////////////////////////////////

My boundaries (if I've understood correctly) are 1 and 3 are tidal maritime and 2 is the river. If I use PRESCRIBED BOUNDARIES = 0;100;0 instead of the LIQUID BOUNDARIES FILE then the case runs fine.

Any suggestions would be greatly appreciated.

Thanks,

Tom

Hello Tom,

If you use a LIQUID BOUNDARY FILE and want to compute tidal boundary conditions for tide, you have to give something to the liquid boundaries with prescribed elevations before the computation of tidal boundary conditions, even dummy. You can write for example PRESCRIBED ELEVATIONS = 0.;0.;0. and it should work.
Another solution which is much less convenient is to fill in SL(1) and SL(3) with dummy values. FYI, if not prescribing flowrates for boundaries #1 and 3, you dot not need to fill in the LIQUID BOUNDARY FILE with their valuers, only Q(2) is mandatory as you prescribe flowrates.

Maybe you should read the TELEMAC-2D user manual available:
- in $HOMETEL/documentation/telemac2d/user with the pdf file (if you use a tagged version, otherwise compile the documentations),
- or on wiki.opentelemac.org/doku.php?id=documentation_v8p1r1

For the T2D user manual, please read the latest one available in v8p1r1, it was updated a few months ago.

Hope this helps,

Chi-Tuan

Hi Chi-Tuan,

Thank you for this.

The manuals are very good but I had not appreciated the requirement for dummy variables.

Much obliged and I feel I am making good progress with assistance from the very helpful community.

Tom