## About the hc ,Tcline and hmin

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liangliang
Posts: 61
Joined: Mon Jul 20, 2009 2:41 pm
Location: Port And Costal Engineering Laboratory

### About the hc ,Tcline and hmin

everyone:
I know 'hc' is citical depth ,and 'Tcline' is surface/bottom layer width,hc=min(hmin,Tcline)
But in my model ,the water is very shallow ,so there are many negative values in the 'h'.
I want to ask some qustions:
If the min 'h' is negative, is the 'depthmin' set to negative value?
And can the 'hc' be set to a negative value?
Thanks

tony1230
Posts: 87
Joined: Wed Mar 31, 2010 3:29 pm
Location: SKLEC,ECNU,Shanghai,China

### Re: About the hc ,Tcline and hmin

And can the 'hc' be set to a negative value?
hc can be any positive value , but negative ones!

kate
Posts: 3921
Joined: Wed Jul 02, 2003 5:29 pm
Location: CFOS/UAF, USA

### Re: About the hc ,Tcline and hmin

The newer vertical parameters for Vstretching, Vtransform not equal to one are designed for your case and allow hc to be bigger than hmin.

staalstrom
Posts: 31
Joined: Mon Feb 04, 2008 3:43 pm
Location: NIVA, OSLO, NORWAY

### Re: About the hc ,Tcline and hmin

Hello

I have more questions conserning this subject.
I want to set hc>hmin. hmin is now 2m and I will now try hc=20.
I use Vtransform=2 and Vstreching=1. I make initial condition by using hc=20
and set Tcline=20 and hc=20 in this file.
In ocean.in I set Tcline=20.
But when I run my application I get an error that say that hc is set to 2m.

Why is hc set to the shallowest depth when Vtransform=2?

brds
Andre Staalstrom

staalstrom
Posts: 31
Joined: Mon Feb 04, 2008 3:43 pm
Location: NIVA, OSLO, NORWAY

### Re: About the hc ,Tcline and hmin

Hello again

And one more question:
Is it necessary to recompile the code to use Vtransform=2?
Or is it enough to set it in ocean.in?

I use roms-3.2 by the way.

brds
Staalstrom

kate
Posts: 3921
Joined: Wed Jul 02, 2003 5:29 pm
Location: CFOS/UAF, USA

### Re: About the hc ,Tcline and hmin

You shouldn't need to recompile, but you do need to have a reasonably current version of set_depth.F. You might want to compare yours to that in the latest code. Also, there were versions with the new set_depth, but with historic code that wasn't clued in to not reset hc. I'm not sure which routine that was happening in.