about nutrient concentration in river

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jschoi
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Joined: Wed Apr 12, 2017 6:20 pm
Location: Chonnam National Univ.

about nutrient concentration in river

#1 Post by jschoi » Tue May 16, 2017 3:45 am

Hi dear.

I use fennel model in ROMS.
my question is nutrient concentration in river.
I don't entered concentrations of bio variable in river file.
so when running model, what's the value? zero? or default?

if default,
how to calculate this tile?

thanks for reading

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kate
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Location: IMS/UAF, USA

Re: about nutrient concentration in river

#2 Post by kate » Tue May 16, 2017 5:01 am

Some fields are assumed to be zero in the rivers, like zooplankton concentration. Some nutrients are in the rivers and people do study that. One such study is here.

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wilkin
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Re: about nutrient concentration in river

#3 Post by wilkin » Tue May 16, 2017 11:01 am

There are logical flags in bio_Fennel.in that activate/deactivate tracers in the river file.

Code: Select all

! Logical switches (TRUE/FALSE) to activate biological tracers point
! Sources/Sinks (like river runoff) and to specify which tracer variables
! to consider: [NBT,Ngrids] values are expected. See glossary below for
! details.

  LtracerSrc == 12*F
Any flags that are False will effectively cause zero concentration for that tracer. ROMS only reads from the river netcdf file the variables for which LtracerSrc is True. Check your logfile (stdout) to see which variables were read.
John Wilkin: DMCS Rutgers University
71 Dudley Rd, New Brunswick, NJ 08901-8521, USA. ph: 609-630-0559 jwilkin@rutgers.edu

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kate
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Re: about nutrient concentration in river

#4 Post by kate » Wed May 17, 2017 9:56 pm

wilkin wrote:Any flags that are False will effectively cause zero concentration for that tracer.
I don't think this is true. I think having the flag set to true and the concentration to zero is the correct thing to do. Having volume inflow without providing tracer concentrations is asking for trouble.
ROMS only reads from the river netcdf file the variables for which LtracerSrc is True. Check your logfile (stdout) to see which variables were read.
This is true.

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