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TOPIC: vegetation effect on waves in 2D implementation

vegetation effect on waves in 2D implementation 5 years 4 days ago #33549

shivanesh.rao
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Hi all,

I'm trying to implement a hydrodynamic model coupled with a wave model for a lake system, i.e., Chittaway Bay in southern lake Tuggerah in NSW, Australia. From the telemac-tomawac model manuals descriptions, it appears that I can use this tomawac to model the waves in this lake (no harbour like topography and no reflecting structures).

The lake has a lot of vegetation along its shoreline (and not much vegetation deeper in the lake). From looking at QVEG in the tomawac V7p0, the vegetation seems to be applied as a domain uniform feature, i.e., a constant dissipation value, R0.

If I want to do a 2D grid of vegetation, can I modify R0=constant to R0=some_analytic_function(x,y,z). This would allow me to specify 0.D0 at deeper ends and 1.D0 at shallower ends.

The change seems fairly straightforward and simple, so I'm wondering if I'm breaking the model in some way by doing this (that is not obvious).

Cheers,
Shiv

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vegetation effect on waves in 2D implementation 4 years 10 months ago #33975

tfouquet OFFLINE Moderator Posts: 287 Thank you received: 105	hello Of course it is possible, you will find an example of such a dependance in the subroutine qveg of the test case dean. that will not break anything
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vegetation effect on waves in 2D implementation 6 months 3 days ago #43606

MathieuSoulayrol
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Hi everybody,
In version v8p4r0 of Tomawac. The example case "veget" don't use the QVEG subroutine for calculate wave dissipation on a wave flume. I want to re-use this example for a coastal purpose, but I just can't figure out if it's possible to define a vegetation zone within my domain. I have the impression that it's applied to the whole estate.

Can you help me with this?

Thank you in advance,
Mathieu S.

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vegetation effect on waves in 2D implementation 6 months 3 days ago #43609

shivanesh.rao OFFLINE Junior Boarder Posts: 37 Thank you received: 1	Hi Mathieu, Attached is what I did. You can set polygon vertices in qveg.f file and call that fortran file in the tomawac cas file. Cheers, Shiv File Attachment: File Name: scenario_hydro.cas File Size: 6 KB File Attachment: File Name: bv_qveg.f File Size: 6 KB File Attachment: File Name: scenario_wave.cas File Size: 5 KB
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vegetation effect on waves in 2D implementation 6 months 2 days ago #43616

MathieuSoulayrol OFFLINE Junior Boarder Posts: 35 Thank you received: 2	Thank you so much, have a good day Mathieu
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vegetation effect on waves in 2D implementation 6 months 2 days ago #43617

MathieuSoulayrol OFFLINE Junior Boarder Posts: 35 Thank you received: 2	Do you think writing vegetation parameters in the tomawac.cas file as in the example "Veget" overrides the parameters specified in the qveg subroutines? / / VEGETATION / VEGETATION TAKEN INTO ACCOUNT = YES VEGETATION DISSIPATION COEFFICIENT = 1. NUMBER OF PLANTS M2= 20. STEM DIAMETER=0.25 BULK DRAG COEFFICIENT=0.2 VEGETATION HEIGHT=2. thanks
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vegetation effect on waves in 2D implementation 6 months 2 days ago #43618

shivanesh.rao
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to be honest, I'm not sure. I hard coded the fortran file and it was simple enough since we were not changing those values.

Anything hard coded would likely not change but you can try to set CAS file to veg diss coeff=0 & hard code the same variable in the fortran file to 1 and see if it listens to CAS or fortran.

OR not fill in the NV, BV,CD, DV values in the fortran file and only specific them in CAS and see if it works.

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vegetation effect on waves in 2D implementation 6 months 2 days ago #43619

MathieuSoulayrol OFFLINE Junior Boarder Posts: 35 Thank you received: 2	I've tried it, so qveg.f takes over. My lines in tomawac.cas are useless
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vegetation effect on waves in 2D implementation 6 months 2 days ago #43623

shivanesh.rao OFFLINE Junior Boarder Posts: 37 Thank you received: 1	yeah, hard coded lines always override. I assume you still run your simulations by entering the parameters into qveg.f?
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vegetation effect on waves in 2D implementation 6 months 1 day ago #43624

MathieuSoulayrol OFFLINE Junior Boarder Posts: 35 Thank you received: 2	yes, that's how I do it Thank you for your help
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