[RegCNET] Lateral Boundary Treatment (fwd)

[Simon Krichak]

Hi,

Please remaind where the vaues of anudg are defined.

Simon Krichak,
Principal Research Associate, Dept. of Geophysics and
Planetary Sciences, Faculty of Exact Sciences,
Tel Aviv University, Ramat Aviv, 69978,
Tel Aviv, Israel, e-mail: shimon at cyclone.tau.ac.il,
Fax:+972-3-6409282, Tel: +972-3-6405694

----- Original Message ----- 
From: "XUNQIANG BI" <bixq at ictp.it>
To: <regcnet at lists.ictp.it>
Sent: Thursday, September 25, 2008 2:39 PM
Subject: Re: [RegCNET] Lateral Boundary Treatment (fwd)



---------- Forwarded message ----------
Date: Thu, 25 Sep 2008 12:51:16 +0200 (CEST)
From: XUNQIANG BI <bixq at ictp.it>
To: Hang Wai Tong <hangwai127 at yahoo.com.hk>
Subject: Re: [RegCNET] Lateral Boundary Treatment


On Thu, 25 Sep 2008, Hang Wai Tong wrote:

>  Could you please give me more example on how to tune anudg ?
>  For example, if i increase the buffer zone size, how should I
>   tune anudg to balance the LBC forcing?
>
>  Tong Hang Wai

When I say to balance the LBC forcing, I mean that you have two
experiments: for example,

one 50km resolution domain (100*80),  with 12 grid buffer zone; and
one 25km resolution domain (200*160), with 23 grid buffer zone.

In this case, you can not use the same anudg for the two run and
make the comparision between them. Instead, you need to increase
the anudg in the 2nd experiment.

See the lines in nudge,F

nudge.F:       xfune(mm,kk)= dexp(-dble(mm-2)/anudg(kk))
nudge.F:       xfune(mm,kk)= dexp(-dble(mm-2)/anudg(kk))
nudge.F:       xfune(mm,kk)= dexp(-dble(mm-2)/anudg(kk))
nudge.F:       xfune(mm,kk)= dexp(-dble(mm-2)/anudg(kk))
nudge.F:       xfune(mm,kk)= dexp(-dble(mm-2)/anudg(kk))

At the same location, you should get roughly the same xfune,

Regards.
Bi Xunqiang
>
>  --- 2008å¹´9æo^25æ-¥ æ~YæoYå>>ï¼OXUNQIANG BI <bixq at ictp.it> 寫é"ï¹.
>  å¯"件人: XUNQIANG BI <bixq at ictp.it>
>  主é¡O: Re: [RegCNET] Lateral Boundary Treatment
>  æ"¶ä»¶äºº: "guogl" <guogl at ieecas.cn>
>  å?¯æo¬(CC): regcnet at lists.ictp.it
>  æ-¥æoY: 2008 9 25 æ~YæoYå>> ä¸<å^ 3:24
>
>  Hi, Guo:
>
>  In parame file under RegCM/Main, the two parameters, nspgx and nspgx,
>  decide the buffer zone width.
>
>  In param.F, the array anudg (with size of kx) decides the weight
>  factor of the LBC forcing. If you increase the size of buffer zone,
>  you need also tuning this array to balance the strength of LBC forcing.
>
>  Hope it helps,
>  Bi Xunqiang
>
>  On Thu, 25 Sep 2008, [gb2312] guogl wrote:
>
> >  Hi
> >   How to modify the value of "buffer area" when treating Lateral
>  Boundary? Can you tell me which file I should modify? Thanks!
> >
> >
>            GuoLong Guo
> >
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     Dr. Xunqiang Bi         email:bixq at ictp.it
     Earth System Physics Group
     The Abdus Salam ICTP
     Strada Costiera, 11
     P.O. BOX 586, 34100 Trieste, ITALY
     Tel: +39-040-2240302  Fax: +39-040-2240449
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


--------------------------------------------------------------------------------


> _______________________________________________
> RegCNET mailing list
> RegCNET at lists.ictp.it
> https://lists.ictp.it/mailman/listinfo/regcnet


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.169 / Virus Database: 270.7.2/1689 - Release Date: 24/09/2008 
18:51