Ocean Modeling Discussion

jcwarner wrote:i believe you are understanding correctly.
-j

Got it! Thanks!
-Peng

Thanks John! :D So you suggest that the current "TKE_WAVEDISS" accounts for wave breaking (Dissip_break) and whitecapping (Dissip_wcap), but does not involve the nonbreaking effect. Also, since the "CRAIG_BANNER" scheme is based on Craig and Banner (1994), it should also only des...

Hi, Usually, we could add wave-induced mixing into our model by activating " CHARNOK+CRAIG_BANNER " or " ZOS_HSIG+TKE_WAVEDISS ". And we know that wave breaking, stirring by nonbreaking waves, Stokes drift interaction with the Coriolis force and Langmuir circulation could all aff...

Hi all, Maybe I have found the problem, that is the raw function "grid_connections.m" might have difficulty in handling the "2-lines" case. Just see Figure5 in this reply and you will get it if you are also working on the nested grids. The modified "grid_connections.m" ...

Dear ROMS developers and users, I have successfully run a 3-layer nested case using the newly published version of the ROMS, and the child grids are both refinement grids (layer2 totally in layer1, and layer3 totally in layer2). The locations of the three grids are shown in Figure1, while the runnin...

Now I have got the answer myself, all momentum terms should have take the plus-minus sign into consideration, when one tries to make analysis, it should be consistent with the chosen momentum equation form.

Hi ALL Recently, I am working on the ROMS momentum balance problems, I reviewed topics about momentum balance and checked relative papers or manual, it would not work because the equation differs with each other, but I confirmed that ubar_accel = ubar_hadv+ubar_cor+ubar_prsgrd+ubar_sstr+ubar_bstr (f...

I do the angle rotation this way (in Matlab but you get the idea) using complex numbers. The reverse transformation (geographic to roms) just needs the opposite sign on the angle. % rotate coordinates from roms xi,eta grid directions to geographic east,north % (but only after averaging/interpolatin...

I think may be the code for transforming real velocity to model velocity should be as follows, but I am not sure...

u(XI,ETA) = u(LON,LAT)*cos(angle(i,j))+v(LON,LAT)*sin(angle(i,j))
v(XI,ETA) = (u(LON,LAT)*sin(angle(i,j))-v(LON,LAT)*cos(angle(i,j)))*-1

I think you should set the 4 "0.0" to the real longitude or latitude, this may work. !------------------------------------------------------------------- 0.0 0.0 : bottom and top map latitudes (south values are negative). 0.0 0.0 : left and right map longitudes (west values are negative). ...

Hi all I believe many of us have used the ROMS_tools package for MATLAB(http://www.brest.ird.fr/Roms_tools/) to generate a grid. When we use this package, we should set the parameters and the paths in the " romstools_param.m " first. Although there are comments around the parameters, I am ...

Hi baipeng_up, I know there are some errors in TPX07,in the model I used the amplitude and phase got from NAO99, but the tidal current components is from TPX07, is this the reason of bas simulation? Hi anthena, why not turnning off the "UV_TIDES" in the *.h file and just use the amplitude...

Hi all When I simulated the tide in Bohai Sea, I confront a problem: the phase of M2 S2 K1 O1 is not good(fig 01), compared to other results(fig NAO_m2),there are large errors. I know the topography and bottom firction are significant to tide. the depth of Bobai Sea is used the newest data ectracte...

There are two ways to add tidal forcing files to the ROMS according to the ROMS manual, but, I wonder if we could only add tidal constituents of some tide-gauge stations along the coast?

But does zeta go bad everywhere or just certain places? What sort of places? Is this a 2-D simulation or could things be going bad in some other way first? Why do you suspect your grid file of being bad? The zeta goes bad everywhere, and I checked the r-value of my grid, the result is too big. I ha...

geo_ytwin wrote:Sometimes I use seagrid to generate my grid. Generally, I will directly make my grid by matlab.
Also,roms_tools downloaded from IRD is the toolbox I used.

Ok, I get it.
Thanks a lot!

If you are using TPXO, why not extract the velocities and use them too? Many of us have troubles with ROMS, but there's more than one kind of trouble. Where do the fields go bad and how do they look? Tanks for your reply! I just want to see the result only forced by the "Amplitude" and th...

What is the horizontal resolution and minimum water depth of your model? In my experience, increaing the hmin will also help the model integrate forward. In addition, you can try to reduce the resolution in the begining. When the model can run smoothly, then more detailed work is needed to refine t...

Hi I was running a real tide case recent days, and I only provide only 1 tide forcing file for the ROMS, no initial file, no climatory file, also no other foring files. Additionally, I used TPXO7 data for making the tide forcing file. But, the program was always blowing up, and the result seemed to ...