Parameter Theta s and theta b don't work

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hpd14thu
Posts: 68
Joined: Tue May 01, 2018 3:56 pm
Location: Tsinghua University

Parameter Theta s and theta b don't work

#1 Unread post by hpd14thu »

I set theta s=5 and theta b=0.4 , these parameters should work on the spacing of near-surface.
But the value of s_rho shows that the grid is still equidistant.

I wonder how to solve this problems, look forward to your reply.

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wilkin
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Re: Parameter Theta s and theta b don't work

#2 Unread post by wilkin »

s_rho is not the final dimensional vertical coordinate. s_rho depends on the choice of TRANSFORM and the final z depths depend on the STRETCHING applied to s_rho.

Read https://www.myroms.org/wiki/Vertical_S-coordinate

There are Matlab and Python routines to compute z offline from the Vtransform, Vstretching choices and the parameters theta* etc.

Setting Hout(idpthR) == T in ocean.in will also write the time varying (because of zeta(t)) z coordinates to the history file.
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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hpd14thu
Posts: 68
Joined: Tue May 01, 2018 3:56 pm
Location: Tsinghua University

Re: Parameter Theta s and theta b don't work

#3 Unread post by hpd14thu »

wilkin wrote:s_rho is not the final dimensional vertical coordinate. s_rho depends on the choice of TRANSFORM and the final z depths depend on the STRETCHING applied to s_rho.

Read https://www.myroms.org/wiki/Vertical_S-coordinate

There are Matlab and Python routines to compute z offline from the Vtransform, Vstretching choices and the parameters theta* etc.

Setting Hout(idpthR) == T in ocean.in will also write the time varying (because of zeta(t)) z coordinates to the history file.

Thank you, your answer really helps a looot!

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