Search found 39 matches

by csherwood
Tue Nov 19, 2019 6:55 pm
Forum: Job Opportunities
Topic: US Geological Survey GS-9 Oceanographer
Replies: 0
Views: 213

US Geological Survey GS-9 Oceanographer

Announcing a vacancy for a US Geological Survey Technical Information Specialist (Oceanographer) at the Woods Hole Coastal and Marine Science Center in Woods Hole, MA. https://www.usajobs.gov/GetJob/ViewDetails/552104200 Announcement number RES-2020-0016 Closes December 4, 2019 Major duties: · Data ...
by csherwood
Fri Nov 15, 2019 10:48 pm
Forum: Job Opportunities
Topic: US Geological Survey GS-9 Geographer
Replies: 0
Views: 196

US Geological Survey GS-9 Geographer

We are looking for a bright, motivated new hire to map and classify change in coastal landscapes with the US Geological Survey, Woods Hole Coastal and Marine Sciences Center,located on the campus of the Woods Hole Oceanographic Institution on Cape Cod. Several similar positions have been posted rece...
by csherwood
Mon Jun 10, 2019 1:30 pm
Forum: Job Opportunities
Topic: USGS Term Position: Research Oceanographer (GS-12) in Woods
Replies: 0
Views: 402

USGS Term Position: Research Oceanographer (GS-12) in Woods

We are looking for a coastal-ocean modeler in Woods Hole. Ideally, someone familiar with ROMS or COAWST. This is a term position (GS-12) suitable for PhD (or equivalent work experience). US citizenship required. Contact John Warner (jcwarner@usgs.gov) or Chris Sherwood (csherwood@usgs.gov) with ques...
by csherwood
Thu May 03, 2018 9:21 pm
Forum: ROMS Installation
Topic: Will it be convenient (in the long run) to use Windows?
Replies: 7
Views: 3202

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

:D The good news: Tarandeep Kalra and I successfully installed ROMS (COAWST version) in the bash console of Windows 10. My version of Ubuntu in my bash window is not the latest (16.10 or higher is now available). csherwood@IGSAGIEGWSCSH10:/mnt/d/u/sed_toy$ lsb_release -a No LSB modules are available...
by csherwood
Wed Dec 21, 2016 4:02 pm
Forum: User Applications
Topic: LTRANS: Larval TRANSport Lagrangian model
Replies: 40
Views: 33311

Re: LTRANS: Larval TRANSport Lagrangian model

As far as I know, LTRANS is still a good approach for post-processing ROMS output to track dynamic particles.
The original developer, and probably the best contact, is Elizabeth North at enorth@umces.edu.
See her web page at: http://www.umces.edu/hpl/people/enorth

Regards, Chris
by csherwood
Fri Dec 02, 2016 8:13 pm
Forum: Job Opportunities
Topic: USGS Woods Hole Marine Technician - Fast Response Needed
Replies: 0
Views: 1792

USGS Woods Hole Marine Technician - Fast Response Needed

Hey Modelers! Our group in Woods Hole has an opening for a marine field / lab tech. The job is a government term position. It is listed as an electronics tech position, but the job will entail a wide range of work associated with coastal and oceanographic fieldwork. Info about applying is at: https:...
by csherwood
Mon Mar 21, 2016 12:31 pm
Forum: Job Opportunities
Topic: Another USGS Mendenhall Postdoctoral Fellowship
Replies: 0
Views: 6842

Another USGS Mendenhall Postdoctoral Fellowship

The USGS is offering a postdoctoral fellowship for researchers interested in developing morphological change models to improve forecasts of coastal vulnerability. The full announcement is here: http://geology.usgs.gov/postdoc/opps/2016/round16/16-29%20Sherwood.htm Other Mendenhall opportunities ae l...
by csherwood
Mon Mar 21, 2016 12:30 pm
Forum: Job Opportunities
Topic: USGS Mendenhall Postdoctoral Fellowship
Replies: 1
Views: 3602

Re: USGS Mendenhall Postdoctoral Fellowship

The USGS is also offering a postdoctoral fellowship for researchers interested in developing morphological change models to improve forecasts of coastal vulnerability. The full announcement is here:
http://geology.usgs.gov/postdoc/opps/20 ... erwood.htm
by csherwood
Fri Sep 05, 2014 11:35 am
Forum: ROMS Installation
Topic: Netcdf downloading via Cygwin
Replies: 64
Views: 288535

Re: Netcdf downloading via Cygwin

Hi Mark and Bene, Unless things have changed, the NC_CONFIG macro is not very smart, and doesn't actually search for installed versions of NetCDF...it just assumes the netCDF files are in the location associated with the NC_CONFIG macro. Thus, if you have multiple netCDF installations, or have just ...
by csherwood
Wed Apr 02, 2014 1:20 am
Forum: ROMS Bugs
Topic: bug running around my screen
Replies: 1
Views: 1350

Re: bug running around my screen

That is not a bug.

It is a
Image
by csherwood
Fri Dec 27, 2013 3:37 pm
Forum: ROMS Ecosystem
Topic: How to force a 1D vertical case?
Replies: 2
Views: 3433

Re: How to force a 1D vertical case?

Answering my own question, with thanks to John Wilkin (who showed it to me) and John Warner (who found the key issue for bbl simulations: #undef splines ). You can use atmospheric pressure in ana_pair to impose a horizontal pressure gradient. Use it to make the dp/dx you want, recalling that in stea...
by csherwood
Sat Dec 07, 2013 5:43 pm
Forum: ROMS Sediment
Topic: Suspended sediments: nstp or nnew?
Replies: 0
Views: 1682

Suspended sediments: nstp or nnew?

This question demonstrates a fundamental lack of understanding of how ROMS steps tracers. We are developing a floc model that moves mass from one suspended-sediment tracer class to another. This is a zero-dimensional calculation, performed at every i,j,k location, and integrated over one baroclinic...
by csherwood
Sat Nov 02, 2013 12:19 pm
Forum: ROMS Ecosystem
Topic: How to force a 1D vertical case?
Replies: 2
Views: 3433

How to force a 1D vertical case?

I'd like to be able to simulate steady, uniform open-channel flow efficiently, and get the same results that 1DV models get for turbulence, stress, and velocity profiles when forced with a sloping sea surface. Small periodic domains (sed_toy, bio_toy) with body force or surface stresses don't produc...
by csherwood
Tue May 14, 2013 12:50 am
Forum: User Applications
Topic: LTRANS: Larval TRANSport Lagrangian model
Replies: 40
Views: 33311

Re: LTRANS: Larval TRANSport Lagrangian model

All, We ran into some compiler-specific issues using LTRANS this winter, and they were largely resolved by Elizabeth North and Ian Mitchell. I will forward the link to this thread to them and suggest they respond, but in the meantime, contact them for the latest guidance: Ian Mitchell <imitchell@hpl...
by csherwood
Fri Jan 18, 2013 1:00 pm
Forum: ROMS Installation
Topic: Compile ROMS problem via cygwin
Replies: 27
Views: 7899

Re: Compile ROMS problem via cygwin

I think Mark's suggestion about adding the -lnetcdff library might have gotten lost in the noise. You have to do that. Here is my CYGWIN-gfortran.mk file, which I keep in ../my_ROMS_compilers. I point to that directory in by build.bash file, with: export MY_ROMS_COMPILER=/home/csherwood/src/my_ROMS_...
by csherwood
Wed Jan 02, 2013 2:07 am
Forum: ROMS Sediment
Topic: PROBLEMS RUNNING ESTUARY SEDIMENT TEST
Replies: 6
Views: 4294

Re: PROBLEMS RUNNING ESTUARY SEDIMENT TEST

It is weird that putting the full path name in did not fix the problem. The .f90 files are in the ./Build directory: they are made when the C pre-processor program is run on the .F files, and are a good place to look to see what code is actually included after all of the #ifdef commands are resolved...
by csherwood
Tue Jan 01, 2013 11:04 pm
Forum: ROMS Sediment
Topic: PROBLEMS RUNNING ESTUARY SEDIMENT TEST
Replies: 6
Views: 4294

Re: PROBLEMS RUNNING ESTUARY SEDIMENT TEST

John, I did an svn update (just to make sure we were working on the same code) and copied the build.bash, .in and .h files to a project dir, modified build.bash, and built the estuary test case. Putting this in the .in file: VARNAME = ${HOME}/src/my_roms/ROMS/External/varinfo.dat does not work for m...
by csherwood
Mon Dec 31, 2012 7:07 pm
Forum: ROMS Sediment
Topic: PROBLEMS RUNNING ESTUARY SEDIMENT TEST
Replies: 6
Views: 4294

Re: PROBLEMS RUNNING ESTUARY SEDIMENT TEST

I see a couple things that are either typos or mistakes. The executable is oceanS (note uppercase S). The input file you should be piping to that is ocean_estuary_test.in, not sediment_estuary_test.in (that file should be specified in ocean_estuary_test.in). Unless you have reason to change it, best...
by csherwood
Fri Dec 21, 2012 1:48 am
Forum: ROMS Installation
Topic: Netcdf downloading via Cygwin
Replies: 64
Views: 288535

Re: Netcdf downloading via Cygwin

nc-config is great...but one caution: if you have done multiple attempts...especially unsuccessful attempts...at building or installing the netcdf libraries, you may have more than one nc-config script around, and you'll get the results from the first one encountered on your path. I don't think nc-c...
by csherwood
Fri Dec 14, 2012 1:40 am
Forum: ROMS Discussion
Topic: Question about particle tracking
Replies: 17
Views: 3729

Re: Question about particle tracking

I have used LTRANS with ROMS, and worked with E. North as she developed / applied LTRANS 2 to ROMS runs. The benefits of LTRANS are that it has alot of options for particle behavior, and it is well tested and pretty easy to use. The downside is that the UMaryland version it is not (yet) parallelized...
by csherwood
Mon Aug 08, 2011 1:33 pm
Forum: ROMS Sediment
Topic: ROMS-SWAN Coupled System Users
Replies: 21
Views: 12220

Re: ROMS-SWAN Coupled System Users

Hi John,

I am using it for test cases and at MVCO.

-Chris
by csherwood
Mon May 24, 2010 1:33 pm
Forum: ROMS Sediment
Topic: cohesive transport
Replies: 1
Views: 2156

Re: cohesive transport

Hi MK, The cohesive routines are not in the main branch of ROMS yet, but they are available in private branches of the CSTMS respository. Use svn to grab the most up-to-date versions (which are not totally compatible with the newest version of ROMS) from: https://www.myroms.org/svn/cstm/branches/crs...
by csherwood
Sat Dec 05, 2009 3:14 pm
Forum: ROMS Discussion
Topic: How to diagnose blow-ups with wetting/drying
Replies: 4
Views: 1011

Re: How to diagnose blow-ups with wetting/drying

Update : A simple case (no waves or sediment transport) with the smoothed grid (see note below) now runs to completion, with a tidal range of ~4 m. Neil Ganju suggested changing the s-levels (He da man!). New values are: theta_s = 1; theta_b = .8, tcline = 0. In addition, we switched from UV_QDRAG ...
by csherwood
Thu Nov 26, 2009 1:46 pm
Forum: ROMS Discussion
Topic: How to diagnose blow-ups with wetting/drying
Replies: 4
Views: 1011

Re: How to diagnose blow-ups with wetting/drying

Update on this problem: another run, with DCRIT increased to 0.5 m and tiling switched runs a little longer, and blows up in a different spot (steep channel edge as water level is rising). The location is not close to a tiling boundary.
by csherwood
Wed Nov 25, 2009 9:48 pm
Forum: ROMS Discussion
Topic: How to diagnose blow-ups with wetting/drying
Replies: 4
Views: 1011

How to diagnose blow-ups with wetting/drying

I have been trying to solve a blow-up with wetting and drying. The bathymetry has terrible metrics, according to the output: Maximum grid stiffness ratios: rx0 = 1.960000E+02 (Beckmann and Haidvogel) rx1 = 1.466021E+04 (Haney) However, I don't think this is the problem. For one thing, I am not sure ...
by csherwood
Wed Nov 25, 2009 7:21 pm
Forum: ROMS Documentation
Topic: ROMS/TOMS User Manual
Replies: 14
Views: 20600

Re: ROMS/TOMS User Manual

Kate -

Nothing specific. The USGS Coastal and Marine Program has provided in-kind support as salaries of ROMS and CSTMS contributors and smaller contributions to support travel and workshops.

Happy Thanksgiving!
-Chris
by csherwood
Wed Nov 25, 2009 2:28 pm
Forum: ROMS Documentation
Topic: ROMS/TOMS User Manual
Replies: 14
Views: 20600

Re: ROMS/TOMS User Manual

Hi Kate,

The USGS should be mentioned as ROMS supporters, as should the National Ocean Partnership Program.

Cheers, Chris
by csherwood
Tue Mar 17, 2009 12:11 pm
Forum: ROMS Information
Topic: Chemical Tracers
Replies: 4
Views: 2472

Re: Chemical Tracers

Passive tracers will work fine if all of the isotopes have the same initial age and are not decay products of other isotopes you are modeling. If that is the case, you can decay them all after the ROMS run during post processing.
by csherwood
Fri Aug 29, 2008 8:46 pm
Forum: ROMS Installation
Topic: Compilation problems - Cygwin and ifort
Replies: 2
Views: 1747

Re: Compilation problems - Cygwin and ifort

Nevermind. It had nothing to do with the paths, or at least not the paths of the object files. I needed mspdb80.dll on the path. I am so lame, I can't even figure out how to ensure the .dll is on the path when the linker is invoked, so I put a copy right in the top directory with the makefile. (I am...
by csherwood
Fri Aug 29, 2008 7:48 pm
Forum: ROMS Installation
Topic: Compilation problems - Cygwin and ifort
Replies: 2
Views: 1747

Compilation problems - Cygwin and ifort

[rant] Downloaded the new CSTM trunk, and tried to build it on Cygwin with ifort. The first problem I encountered looked like: ... mod_strings.f90(85) : Error: This name does not have a type, and must have an explicit type. [IA32] character (len=80) :: my_fc = ""/cygdrive/c/Program Files/Intel/Compi...
by csherwood
Wed Jun 11, 2008 5:43 pm
Forum: ROMS Information
Topic: Fortran code conventions
Replies: 6
Views: 3056

Fortran code conventions

I am developing some code that will eventually be included in ROMS, but right now, I am compiling and testing outside the ROMS environment. To make life easier later, I want to write the code using ROMS code conventions. So: 1) Can I (should I) use intrinsic array operators like integer :: IMAX = 10...
by csherwood
Thu Aug 23, 2007 1:17 pm
Forum: ROMS Discussion
Topic: Collaboration, releases, SVN, Trac, flavors of ROMS...
Replies: 11
Views: 11342

You dont really need your own repository

Hi Stef, The new version of ROMS has a directory structure that reduces the need for changing code with each application. Unless you are really developing new components of the model, you can work by updating the from the main repository...in fact, this would keep you in closer touch with any bug fi...
by csherwood
Tue Jul 03, 2007 1:22 pm
Forum: ROMS Bugs
Topic: Minus values of sediment next to sediment point sources
Replies: 18
Views: 6341

Check advection scheme, disable sediment density

It looks like you have more than one TS advection scheme enabled...undefine all except for Also, try it without sediment density effects turned on first...and do a sanity check to make sure your water + sediment density is not ridiculous...you might have to ramp it more gently over several time steps.
by csherwood
Tue May 01, 2007 6:39 pm
Forum: ROMS Discussion
Topic: Collaboration, releases, SVN, Trac, flavors of ROMS...
Replies: 11
Views: 11342

Collaboration, releases, SVN, Trac, flavors of ROMS...

After watching the successes and frustrations of Hernan, John, and others as they worked to release ROMS 3.0, it is obvious that the collaboration technology, or our application of it, is probably not yet optimized. Over the next year, we should think about what method(s) would be easiest and most p...
by csherwood
Mon Feb 12, 2007 2:12 pm
Forum: ROMS Sediment
Topic: SEDMORPH parameters
Replies: 16
Views: 7651

That doesnt work if stratigraphy or limited sediment is enforced. Imagine a cell with only a little available sediment in the top layer...say 1 mm...(for real geologic reasons, not numerical reasons). A big resuspension event strips the bed and puts everything is suspension...and morph factor is 10,...
by csherwood
Fri Feb 09, 2007 11:50 am
Forum: ROMS Sediment
Topic: SEDMORPH parameters
Replies: 16
Views: 7651

Here is my understanding of the problem: the morph factors (in ROMS and D3D) act on the erosion or deposition rates...so at the end of a time step, they deposit or erode X times the amount calulated by the model (call that F for flux). This causes bed elevation changes that are X times greater, so t...
by csherwood
Tue Nov 22, 2005 1:56 am
Forum: ROMS Problems
Topic: ROMS for highly stratified fuild
Replies: 12
Views: 7972

Try the MPDATA advection scheme

I disagree with Liz...the vertical advection scheme is awesome and can run at 5 - 10 x CFL. However, the horizontal advection scheme may be the problem...try using MPDATA, which is positive definate.
by csherwood
Mon Nov 15, 2004 5:29 pm
Forum: ROMS Discussion
Topic: What is the radius of the Earth (and why?)
Replies: 1
Views: 2033

What is the radius of the Earth (and why?)

In trying to regenerate the numbers seagrid comes up with, I found that there are inconsistencies in the earth radii being used. In ROMS (mod_scalars.F) ! Eradius Earth equatorial radius (m). real(r8) :: Eradius = 6371315.0_r8 ! m In earthdist.m (seagrid's routine for calculating spherical distances...
by csherwood
Fri Apr 02, 2004 3:52 pm
Forum: ROMS Discussion
Topic: Treatment of rivers
Replies: 20
Views: 17184

I remember somebody (either John Warner or Hernan) saying the rivers should be put into the top layer. Maybe they can help us with a primer on how to do rivers.

Chris
csherwood@usgs.gov