open TELEMAC-MASCARET The mathematically superior suite of solvers

HI,

I Have issues about my tides calibration in TELEMAC2D

to calibrate the water level (fig ) I change the 3 main parameters in the CAS file :

- the tide range
- the sea level
- the bottom friction coeffcient

But seems impossible to have the match in same time at the Low tide and at the top tide (figure).

The parameters I changed just affected one of them but not the both

DO anyone know how to solve this issue

thx

Hello,

Can you tell what area you try to model? Can you provide a map with the extent of the TELEMAC-2D model to show where your observations are located? What is the depth where you compare the results and the observation? Are there shallows close to the location? Is it possible to see more than 24h observations?

Moreover, about your input files and TELEMAC-2D model:
- which database do you use for tidal constituents? How many of them are considered?
- which version of TELEMAC do you use?
- can you upload your steering file and perhaps FORTRAN files if you add somes?
- what about the bathymetry? Where does it come from? With respect to which level it is referenced (Chart Datum, MSL, other?) and in the model, is there a data manipulation?

Best regards,

Chi-Tuan

Hi,

The point location where I am looking data is close to the harbor (red point on the map), at that area, the depth is around 1.8-2 meters. Unfortunately, I just had 24hrs observations

For TELEMAC inputs, I used
- tpxo09 (H, U provide)
- My version of telemac is the v8por2
- Yes i uploqd my steering file ( for the result I get on the picture, my parameters are TR = 1.02, Sea Level = 0.001 and bottom friction = 0.005
- The bathymetry is a really precise one 20m resolution from the port facilities administration,

Thanks

Hello,

Sorry for the delay. I did not have any keyboard last week with the TUC.

The location of your red point is really shallow and very close to the solid boundary. Could you be able to have other measurements or predictions of tide levels outside the harbour, further from the coast (e.g. from a hydrographic service or a tide gauge)? To calibrate tide levels, it would be easier and would have more sense.
Your tidal signal with TELEMAC could be truncated for low tides when too shallow.

And with respect to which level is the bathymetry referenced (Chart Datum, Mean Sea Level I suppose, other?).

Is it possible to know the total extent of your model? Are you sure the TPXO9 model covers all the maritime nodes where you want to prescribe tidal levels + velocities? Is the area inside an estuary or not? If esetuarian, you may need to have more than a dozen of tidal constituents to be accurate.

But with only 24h observations + so close to the boundary, it will be difficult to conclude.

Chi-Tuan

HI,

The total extent of my model is around 9 km. The bathy is referenced to Mean sea level (I from a Hydrographic service the resolution is 20m --- I converted it to the geodesic) I did correct right ??

The extent of the model is around 10km and it is not located in the estuarine area

the TPXO covers the zone Yes , It in East Canada

Thanks

Hello,

You are right, it is advised to propagate tide around MSL bathymetry.

For the maritime boundary nodes, I wonder if all of them are in the extent of TPXO, because sometimes not, then you may have huge velocities at the liquid boundaries (if you prescribe tidal velocities) or they are interpolated to the nearest neighbour of the TPXO grid.

Chi-Tuan