## Search found 39 matches

Fri Sep 27, 2019 9:51 pm
Forum: ROMS Problems
Replies: 1
Views: 488

I have an idealized simulation in which I am adding a complex river source condition. The goal is to make a boundary source/sink pattern that is like the mouth of an estuary with the usual tidally averaged two layer exchange flow. I am using preprocessing tools and a recent version or ROMS that I ha...
Wed Sep 11, 2019 6:16 pm
Forum: ROMS Discussion
Topic: if I can set hc=Tcline>hmin?
Replies: 7
Views: 731

### Re: if I can set hc=Tcline>hmin?

Thanks very much for the clarification, Kate. It was unclear to me in the wiki which restriction was removed. And now I see in ROMS/Utility/set_scoord.F where this is implemented (lines 176-178 in the version I have):

ELSE IF (Vtransform(ng).eq.2) THEN
hc(ng)=Tcline(ng)
END IF
Wed Sep 11, 2019 4:01 pm
Forum: ROMS Discussion
Topic: if I can set hc=Tcline>hmin?
Replies: 7
Views: 731

### Re: if I can set hc=Tcline>hmin?

Kate, thanks for your helpful response. I agree that what I want to use for hc is the Tcline I specify in the .in file. What is still unclear to me is if "hmin" is used anywhere in the calculation of z. From the "warning" paragraph here: https://www.myroms.org/wiki/Vertical_S-coordinate one way of r...
Tue Sep 10, 2019 11:11 pm
Forum: ROMS Discussion
Topic: if I can set hc=Tcline>hmin?
Replies: 7
Views: 731

### Re: if I can set hc=Tcline>hmin?

I have a related question. I have a grid where the min value of h is 4 m, and I specify Tcline = 10 m in the .in file. So if I am understanding things right ROMS should use hc = 4 m when calculating the z coordinates (I use Transform function 2 and Stretching function 4). Yet in my history files the...
Sun Aug 04, 2019 3:42 pm
Forum: ROMS Problems
Topic: Error climatology file: not include initialization time
Replies: 6
Views: 1344

### Re: Error climatology file: not include initialization time

I am having a related problem. I have a daily model run I do, which has worked fine the past 2 weeks. This morning it did not work because for some reason ROMS was looking for a bry file starting 1 second earlier than the one I made. This is the error message in the log file: CHECK_MULTIFILE - Error...
Mon May 13, 2019 7:22 pm
Forum: ROMS Problems
Topic: Tide Phase Problem
Replies: 4
Views: 732

### Re: Tide Phase Problem

Thanks for the suggestions. I stopped using ramp_tides because (1) it seemed to handle the "rude awakening" without blowing up, and (2) it meant that I always had to make 2 versions of the executable. If I were always doing long "cold start" runs I could just have the ramp_tides version, but my fore...
Mon May 13, 2019 6:31 pm
Forum: ROMS Problems
Topic: Tide Phase Problem
Replies: 4
Views: 732

### Re: Tide Phase Problem

I am adding to all 8 tidal frequencies, and doing so in degrees in my "tides.nc" forcing file. My varinfo.dat implies to me that the input should be in degrees and that ROMS (rev. 823) converts it internally to radians: 'tide_Ephase' ! Input 'tidal elevation phase angle' 'degrees' ! [radians] 'SSH_T...
Mon May 13, 2019 5:18 pm
Forum: ROMS Problems
Topic: Tide Phase Problem
Replies: 4
Views: 732

### Tide Phase Problem

I have a realistic run that uses tidal forcing from TPXO7.2 at the boundaries, both SSH and UV. The tidal forcing runs perfectly in general. I make some hand adjustments the the tidal amplitude when I make the forcing, to better match observations. This also works fine. However when I try to make ad...
Tue Jan 22, 2019 10:19 pm
Forum: ROMS Discussion
Topic: Weights in VSHAPE and layers thickness?
Replies: 6
Views: 2270

### Re: Weights in VSHAPE and layers thickness?

Kate - thanks for the tip. I realize that our choices about the vertical coordinate transform and stretching have not been updated for some time. I tried experimenting with VTRANSFORM = 2 and VSTRETCHING = 4, and can see that the results might be smoother than what I am using, but they won't be fund...
Mon Jan 21, 2019 12:27 am
Forum: ROMS Discussion
Topic: Weights in VSHAPE and layers thickness?
Replies: 6
Views: 2270

### Re: Weights in VSHAPE and layers thickness?

I am using what I think are fairly common vertical stretching parameters: THETA_S,4 THETA_B,0.8 TCLINE,0 N,30 VTRANSFORM,1 VSTRETCHING,1 and when I have a river source with 10 m depth the upper layer is rather thin, like 5 cm. So when I have very high river flow, and a Vshape that varied linearly fr...
Fri Dec 07, 2018 5:10 pm
Forum: ROMS Discussion
Topic: Virtual salt flux sea surface boundary condition
Replies: 4
Views: 1663

### Re: Virtual salt flux sea surface boundary condition

John, I like all the ideas you mention to solve this problem. I favor the more physical solution (add of subtract freshwater) but understand that this will need modifications to the volume conservation. My reason for replying is more basic. I use bulk fluxes and provide a rain field in my forcing, b...
Wed Jul 11, 2018 11:36 pm
Forum: ROMS Sediment
Topic: Wave-current BBL drag coefficient as output
Replies: 4
Views: 2911

### Re: Wave-current BBL drag coefficient as output

Related to this thread, I have a model run which uses quadratic bottom drag. Since there is a wide range of bathymetric depth over the domain, the height above the bottom of the deepest velocity varies from a few cm (shallow water) to tens of meters (deep water). I would like to estimate the velocit...
Fri May 04, 2018 7:51 pm
Forum: ROMS Tools and Techniques
Topic: wind work
Replies: 2
Views: 1021

### Re: wind work

In this paper: MacCready, P., and S. N. Giddings, 2016: The Mechanical Energy Budget of a Regional Ocean Model. J. Phys. Oceanogr., 46, JPO-D-16-0086.1, doi:10.1175/JPO-D-16-0086.1 (available by open access) we calculated the "geostrophic wind work" in Fig 10, and the method of calculation is discus...
Sat Feb 24, 2018 5:44 pm
Forum: ROMS Problems
Topic: excess mixing in k-epsilon GLS mixing; bug or misconfigured?
Replies: 8
Views: 2803

### Re: excess mixing in k-epsilon GLS mixing; bug or misconfigu

Very interesting. What was AKT_BAK for your simulations?
Tue Dec 12, 2017 6:31 pm
Forum: ROMS Problems
Topic: CPU time and MPI issues with nested grids
Replies: 16
Views: 6092

### Re: CPU time and MPI issues with nested grids

John, Here are the time reports from the log file. What stands out is that most of the total time is devoted to message passing between the two grids (I'm not sure why the numbers don't all add up to 100%). Nonlinear model elapsed time profile, Grid: 01 Allocation and array initialization .............
Mon Dec 11, 2017 9:08 pm
Forum: ROMS Problems
Topic: CPU time and MPI issues with nested grids
Replies: 16
Views: 6092

### Re: CPU time and MPI issues with nested grids

Thanks to everyone for your help. I did succeed in getting my realistic run to work with 2-way nesting. The problem is that the performance is poor. I'm running on 144 cores using the Intel compiler and mpi. The parent grid alone runs at faster than 1 minute per hour, and the child grid alone in 3 m...
Fri Dec 08, 2017 10:35 pm
Forum: ROMS Problems
Topic: CPU time and MPI issues with nested grids
Replies: 16
Views: 6092

### Re: CPU time and MPI issues with nested grids

When I create a new grid using coarse2fine.m what is the correct number of rows and columns to put in the .in file for the refined grid? For a regular grid I just look at the size of a field on the rho-grid and subtract 2 from both dimensions to get the right number. Is it the same for the refinemen...
Fri Dec 01, 2017 9:07 pm
Forum: ROMS Problems
Topic: CPU time and MPI issues with nested grids
Replies: 16
Views: 6092

### Re: CPU time and MPI issues with nested grids

I'm trying 2-way nesting in an existing run. I made the refined grid and contacts files using the matlab tools. Then I recompiled the executable using the NESTING flag. When I try to run it with mpirun I get a segmentation fault right away. I'm running on 144 cores across 6 nodes. One question is ab...
Fri Jul 07, 2017 3:23 pm
Forum: ROMS Discussion
Topic: Energetics
Replies: 2
Views: 1201

### Re: Energetics

Reiner, We recently published a paper which gives a method for complete energy budgets in ROMS: MacCready, P., and S. N. Giddings (2016) The Mechanical Energy Budget of a Regional Ocean Model. J. Phys. Oceanogr., 46, 2719–2733, doi:10.1175/JPO-D-16-0086.1. http://journals.ametsoc.org/doi/10.1175/JPO...
Sat Apr 22, 2017 12:03 am
Forum: ROMS Ecosystem
Topic: Climatology and nudging in ecosystem models
Replies: 17
Views: 7375

### Re: Climatology and nudging in ecosystem models

Kate and John,

I added the time attribute to the bio climatology variables in their NetCDF file and this appears to have fixed the problem. Hooray and thanks so much for your help!!

PM
Fri Apr 21, 2017 8:10 pm
Forum: ROMS Ecosystem
Topic: Climatology and nudging in ecosystem models
Replies: 17
Views: 7375

### Re: Climatology and nudging in ecosystem models

Kate, related to your comment about the time variable, in our _clm input file here are what salt (whose climatology is read) and NO3 (whose climatology is not read) look like: In [8]: print(ds['salt']) <class 'netCDF4._netCDF4.Variable'> float64 salt(salt_time, s_rho, eta_rho, xi_rho) long_name: sal...
Fri Apr 21, 2017 7:47 pm
Forum: ROMS Ecosystem
Topic: Climatology and nudging in ecosystem models
Replies: 17
Views: 7375

### Re: Climatology and nudging in ecosystem models

Kate, Here is the complete debugging error message (actually one of many identical ones, presumably because I am running on 72 cores): forrtl: severe (408): fort: (3): Subscript #1 of the array TVAL has value 0 which is less than the lower bound of 1 Image PC Routine Line Source oceanG 0000000001CD5...
Fri Apr 21, 2017 7:06 pm
Forum: ROMS Ecosystem
Topic: Climatology and nudging in ecosystem models
Replies: 17
Views: 7375

### Re: Climatology and nudging in ecosystem models

Thanks very much, John and Kate. Running with USE_DEBUG=on I get errors like: forrtl: severe (408): fort: (3): Subscript #1 of the array TVAL has value 0 which is less than the lower bound of 1 I have turned on the flags for processing of bio tracer climatology in my bio.in file, as well as the nudg...
Fri Apr 21, 2017 6:10 pm
Forum: ROMS Ecosystem
Topic: Climatology and nudging in ecosystem models
Replies: 17
Views: 7375

### Re: Climatology and nudging in ecosystem models

I am having a similar problem to John's. I am trying to read climatology fields (in this case from a NetCDF file instead of specifying them analytically) and use them for nudging to climatology in a strip near the open boundaries. This works fine for the velocities, and for salt and temp, but the ru...
Fri Aug 28, 2015 9:48 pm
Forum: Job Opportunities
Topic: Coastal Modeling Postdoc at University of Washington
Replies: 0
Views: 3581

### Coastal Modeling Postdoc at University of Washington

A Post-doctoral research position in ocean modeling is available in the School of Oceanography at the University of Washington. The successful candidate will join the UW Coastal Modeling Group to work on development and testing of a daily forecast model of coastal-estuarine circulation and biogeoche...
Thu May 02, 2013 6:22 pm
Forum: ROMS Discussion
Topic: diagnostics
Replies: 7
Views: 3051

### Re: diagnostics

I figured out the problem with my salt_rate test. salt_rate is NOT <ds/dt>, where <> denotes averaging over the time period for which diagnostics are collected. Instead (I think) salt_rate = <d(s*v)/dt>/<v> where v is the (changing) volume of a given grid cell. When I use this interpretation to chec...
Mon Apr 29, 2013 7:24 pm
Forum: ROMS Problems
Replies: 10
Views: 4935

### Re: Diagnostics don't add up!

I just tried adding up the momentum diagnostics in one of my runs and couldn't find any obvious error, or any difference between u and v momentum budgets. Are you using "nudging to climatology" in your domain? I believe this would add an extra term to the momentum budgets that would not be in the as...
Fri Apr 12, 2013 9:51 pm
Forum: ROMS Discussion
Topic: diagnostics
Replies: 7
Views: 3051

### Re: diagnostics

I wonder if the problem might arise in the two different versions of the calculation of DiaTwrk(i,j,k,itrc,iTrate) taken from step3d_t.F. I assume the first, active, version forces the salt_rate diagnostic to equal the sum of all the other terms. Then the second, commented out, version appears to ca...
Fri Mar 29, 2013 6:43 pm
Forum: ROMS Discussion
Topic: diagnostics
Replies: 7
Views: 3051

### Re: diagnostics

I did some more analysis on the problem of the salt_rate diagnostic. The plot shows the evolution of temperature and salt at a surface model location, both from history and average files. They look very similar. Then I calculate the time derivative of both and plot it on the bottom row, comparing it...
Fri Mar 29, 2013 12:39 am
Forum: ROMS Discussion
Topic: diagnostics
Replies: 7
Views: 3051

### Re: diagnostics

I'm using the diagnostic feature for some budgets. In the course of some error checking I compared the field from salt_rate to the difference between salt fields from the history files saved at the beginning and end of the diagnostic averaging period. The shapes and magnitudes, e.g. of a vertical pr...
Fri Sep 07, 2012 12:09 am
Forum: ROMS Discussion
Topic: ZCLM_NUDGING
Replies: 1
Views: 1232

### ZCLM_NUDGING

It appears to me that the flag ZCLM_NUDGING is missing from ROMS/Include/cppdefs.h, yet it still seems to have an active role to play in parts of the code, e.g. ana_nudgcoef.h and mod_clima.F (I am using version number 629 of the code). Any thoughts?

Parker
Thu Jun 07, 2012 8:59 pm
Forum: ROMS Installation
Topic: SVN problem
Replies: 4
Views: 3250

### Re: SVN problem

I am trying to get the latest ROMS using svn onto a linux machine. This has worked many times in the past but today it chokes halfway through with the error message: svn: Can't read file 'ROMS_620/Lib/ARPACK/LAPACK/.svn/log': Permission denied A possible clue is that today for the first time I got t...
Tue Dec 13, 2011 4:04 pm
Forum: ROMS Discussion
Topic: river salinity overshoot
Replies: 11
Views: 4698

### Re: river salinity overshoot

In my experience you can help with this problem by making your rivers longer, so that non-zero salinity doesn't penetrate up to the river source cells. This naturally avoids the problem of having very sharp gradients which can lead to numerical inaccuracy.
Fri Oct 28, 2011 3:32 pm
Forum: Job Opportunities
Topic: Postdoc: Modeling coastal-global climate interactions
Replies: 0
Views: 1975

### Postdoc: Modeling coastal-global climate interactions

We seek applications for a postdoctoral research associate at the University of Washington School of Oceanography.  The postdoc will work in new Department of Energy-funded team exploring how circulation and mixing in estuaries and on the continental shelf might change under future climate scenarios...
Thu Mar 04, 2010 5:43 pm
Forum: Job Opportunities
Topic: Postdoc: Harmful Algal Blooms & the Columbia River Plume
Replies: 0
Views: 2266

### Postdoc: Harmful Algal Blooms & the Columbia River Plume

Postdoctoral Position: Harmful Algal Blooms & the Columbia River Plume The interdisciplinary PNWTOX project, jointly funded by NOAA and NSF, will use existing data in parallel with state of the art physical and bio-physical models to advance our understanding of HAB development/dissipation and tran...
Fri Oct 03, 2008 8:54 pm
Forum: ROMS Installation
Topic: ROMS3, g95, OS X 10.5.4, netcdf-3.6.3
Replies: 4
Views: 3144

### Re: ROMS3, g95, OS X 10.5.4, netcdf-3.6.3

Following the suggestions of Andreas and Rob, I got ROMS3.# running on my relatively new MacBook Pro. For reference I have written up the exact steps I used, at:
http://www.ocean.washington.edu/people/ ... notes.html

Cheers, Parker
Wed Jun 04, 2008 4:05 pm
Forum: Job Opportunities
Topic: Estuary Modeling Postdoctoral Position
Replies: 0
Views: 1662

### Estuary Modeling Postdoctoral Position

The University of Washington, School of Oceanography invites applications for a postdoctoral position. The position requires a PhD in Physical Oceanography, or related field, and expertise in numerical circulation modeling. The successful applicant will work closely with a Physical Oceanographer, Dr...
Fri Jun 23, 2006 8:41 pm
Forum: Job Opportunities
Topic: Postdoctoral Research Associate, Coastal Ecosystem Modeling
Replies: 0
Views: 1782

### Postdoctoral Research Associate, Coastal Ecosystem Modeling

The University of Washington, School of Oceanography invites applications for a postdoctoral position. The position requires a PhD in Biological or Physical Oceanography, or related field, and expertise in numerical ecosystem modeling. The successful applicant will work on the Columbia River Plume N...
Mon Apr 19, 2004 3:52 pm
Forum: ROMS Discussion
Topic: Treatment of rivers
Replies: 20
Views: 18397

### Estuarine Boundary Condition Notes

I would like to amplify some of Bob Chant's thoughts. Estuaries take a little bit of river flow, pull in a LOT of ocean water, mix the two, and spit out the mixture, which is usually only slightly fresher than oceanic. Two points then are worth noticing when formulating a "river" BC: (i) the outflow...