## Search found 14 matches

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,...
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
Wed Oct 24, 2018 5:27 am
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...
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.
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...
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.
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...
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 ...
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...
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...
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
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...
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...
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 ...