Boundary condition type definition at river point sources

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Eugen
Posts: 30
Joined: Wed Apr 06, 2016 4:36 pm
Location: University of Liege

Boundary condition type definition at river point sources

#1 Post by Eugen » Thu Nov 23, 2017 12:28 pm

Dear all,

I have a problem with tidal forcing on my domain. The tidal amplitudes are too big in semi-closed bays.

How to define a boundary condition type at river point sources (like we have to do for open boundaries), to make the tides propagate?

The image below is a bias in [m]: M2 tidal amplitudes from ROMS results minus the corresponding TPXO focring.

Evgeny Ivanov

PhD Fellow,
MAST, University of Liege, Belgium

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kate
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Joined: Wed Jul 02, 2003 5:29 pm
Location: IMS/UAF, USA

Re: Boundary condition type definition at river point source

#2 Post by kate » Thu Nov 23, 2017 4:28 pm

Tides are only forced at the open boundaries, not at rivers. You'll probably have to do something like increase the bottom drag in those bays. We have a bottom drag that's a function of depth for just such cases.

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jivica
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Joined: Mon May 05, 2003 2:41 pm
Location: The University of Western Australia, Perth, Australia

Re: Boundary condition type definition at river point source

#3 Post by jivica » Fri Nov 24, 2017 5:26 am

Seems to me that tidal forcing doesn't match :?: :!: at your northern region either, this is where your BC are.
You can have amplification in the the bays, like resonance, and if you are having say 10% wrong BC than that can result with large errors elsewhere, even more in bays like that, sensitive to those periods.

I would check my BC and analysis if were you, then worry about river inlets..

Good luck!

Cheers
Ivica

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