Search found 14 matches

by ezaron
Tue Sep 08, 2020 6:02 am
Forum: ROMS Discussion
Topic: Appropriate open boundary conditions for tidal forcing
Replies: 11
Views: 1312

Re: Appropriate open boundary conditions for tidal forcing

Hi Guangyu, If you have the time to run a test from an idealized initial condition, it might illustrate the performance of the boundary conditions. If you designed an idealized initial condition (and matching open boundary conditions) with, say, a large eddy centered on the midpoint of one boundary,...
by ezaron
Mon Dec 02, 2019 3:45 pm
Forum: ROMS Trivia
Topic: u,v high resolution database
Replies: 7
Views: 1307

Re: u,v high resolution database

AMSEAS was running back in 2010, @ 1/36 deg:

https://www.ncdc.noaa.gov/data-access/m ... o-ncom-reg

-Ed
by ezaron
Wed Oct 24, 2018 5:27 am
Forum: ROMS Adjoint
Topic: what are the meanings of adjoint model's input and output
Replies: 3
Views: 1124

Re: what are the meanings of adjoint model's input and outpu

Hi Li, Suppose you are interested in a linear function of the model's trajectory. Let the value of this function be denoted, y. Then there exists another function, call it K(x,t), which permits you to compute y using an inner product: y = \int_D \int_0^T K(x,t) u(x,t) dx dt. The model's trajectory i...
by ezaron
Sat May 05, 2018 4:53 am
Forum: ROMS Installation
Topic: Will it be convenient (in the long run) to use Windows?
Replies: 7
Views: 3730

Re: Will it be convenient (in the long run) to use Windows?

lol. Aha, I was replying to the OP. Just noticed it was from 2 yr ago.
by ezaron
Fri May 04, 2018 5:08 am
Forum: ROMS Installation
Topic: Will it be convenient (in the long run) to use Windows?
Replies: 7
Views: 3730

Re: Will it be convenient (in the long run) to use Windows?

I assume this is a sincere question, rather than trolling to start a flame-war. Once you get over the modest (but never-ending) learning curve, you will find so much better tools are available in the native linux world. Your path will be easier if you bite the bullet and buy a decent book on linux s...
by ezaron
Sun Mar 19, 2017 3:58 pm
Forum: ROMS Discussion
Topic: ROMS not bit-reproducible: northern boundary?
Replies: 32
Views: 8527

Re: ROMS not bit-reproducible: northern boundary?

There is some literature on maintaining bit-reproducible simulations under MPI, e.g.,
http://www.sciencedirect.com/science/ar ... 9114000507

While the lack of bit-level reproducibility is annoying, hopefully the divergence of solutions is not physically significant.
by ezaron
Fri Jul 11, 2014 4:06 am
Forum: ROMS Discussion
Topic: Announcement: Modeling and Observing the Tides in the Ocean
Replies: 0
Views: 760

Announcement: Modeling and Observing the Tides in the Ocean

Jim Richman, Richard Ray, Patrick Cummins and I have proposed a session #2250 on Modeling and Observing the Tides in the Ocean at the 2014 Fall AGU Meeting in San Francisco. I invite you to consider submitting an abstract to this session. The session summary is: A resurgence of interest in ocean tid...
by ezaron
Thu Jun 12, 2014 1:22 am
Forum: ROMS Discussion
Topic: tidal analysis of large output files
Replies: 22
Views: 7436

Re: tidal analysis of large output files

Hi Hashemi, If you are comfortable modifying the ROMS code, it is not too difficult to do the harmonic analysis during the run. The steps are more-or-less as follows: - Select a set of tidal frequencies for analysis - Determine the duration of run needed to separate the selected frequencies - Start ...
by ezaron
Fri Apr 06, 2012 2:45 am
Forum: ROMS Discussion
Topic: modeling internal tides in a canyon: solution not converged
Replies: 7
Views: 2838

Re: modeling internal tides in a canyon: solution not conver

Hi Shih-Nan This can be a difficult problem. So it is good you are checking out convergence. From my understanding of Shchepektin's descriptions of the numerics, the energetics of ROMS should be pretty accurate, but I think DiLorenzo is the only one to systematically verify the convergence of intern...
by ezaron
Sun Jan 30, 2011 4:05 am
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 25088

Re: Intel’s new i7 980x CPU gives disappointing speedup

Alex, Thanks a lot for writing this review and taking the time to engage with the original poster. It is no small task to assemble the list of examples and history into a narrative as you have done. And I think your final take-home point is very well said. If you would consider writing a topical pie...
by ezaron
Fri Sep 10, 2010 2:51 am
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5693

Re: Results and issues of barotropic tidal run

Check out the FES2004 tidal model. It may be more accurate in this region.

-Ed
by ezaron
Mon Jul 26, 2010 2:08 am
Forum: ROMS Discussion
Topic: Why I got such a different tide solution using TPXO data
Replies: 13
Views: 4665

Re: Why I got such a different tide solution using TPXO data

Hi Stone, In addition to the other suggestions, above, you should know that the OTIS bathymetry is unlikely to yield a very good result here. There is a paper by Jan Sen that discusses the shelf resonance between China and Taiwan, and the importance of good bathymetry for modeling M2 correctly. Also...
by ezaron
Tue Jan 05, 2010 5:21 pm
Forum: Job Opportunities
Topic: Graduate Research positions, Portland State University
Replies: 0
Views: 1538

Graduate Research positions, Portland State University

Position 1: A Graduate Research Assistantship is available immediately upon acceptance for an individual with an undergraduate (or MS) degree in physics, applied math or related discipline, interested in evolving tidal amplitudes in the Pacific Ocean and their relationship to global climate. Applica...
by ezaron
Tue Jan 05, 2010 5:18 pm
Forum: Job Opportunities
Topic: Postdoc: North Pacific Tides, Portland State University
Replies: 0
Views: 1779

Postdoc: North Pacific Tides, Portland State University

Postdoctoral Research Associate Department of Civil and Environmental Engineering, Portland State University Position Summary: The Portland State University (PSU) Department of Civil and Environmental Engineering, Maseeh College of Engineering and Computer Science, has a diverse and growing program ...