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Hi All,

Has any one calculated the area based on velocity level or concentration level?
For example, the area covered by Salinity above 30 etc.


Regards
Gao

Hi Gao,
I have calculate this with python post-processingon the slf-files. You can read the tracer, calculate how many output timesteps are above the threshold, and multiply this with the time between output timesteps.

I don't have a clean example to share, but it should be rather straight forward following the scripting-examples in the notebooks.

You can probably also do similar steps in BlueKenue.

Since Blue Kenue was mentioned...

There is "All Observations > Duration Above Threshold..." for a Time Series.

And there is also "Extract Duration Exceedance Mesh..." for a 2D T3 Scalar Mesh with multiple frames. This basically does "Duration Above Threshold" at each node location in the mesh and produces a mesh as output.

Hope this helps a little... Alan

Thank you Alan,

I mean the area covered by a certain value /or above, or the area covered or circled by the contour line.

Regards
Gao

For a 2D triangular mesh... in Blue Kenue there is Tools > Compute Area... which is the whole mesh's area for the current frame. There is also Tools > T3 Mesh > Extract Subset... to give you a mesh that is only within a polygon.

But it seems, upon first blush, that Blue Kenue isn't quite there because you only want the area (for the current frame) when a triangle's values are greater than or equal to, say 30. Since each triangle has 3 values and each of those values may be above or below 30... what would you expect to happen?

• Use the area of a triangle (in a mesh) if all 3 vertices have values exceeding 30 and do NOT use the area otherwise
• Use the area of a triangle (in a mesh) if the mean of the 3 vertices has a value exceeding 30 and do NOT use the area otherwise
• Something else?

Kindly... Alan