Search found 6 matches

by zhzhlin
Thu Feb 17, 2022 7:45 pm
Forum: Job Opportunities
Topic: 2 modeling positions at California Department of Water Resources (Deadline Feb22)
Replies: 0
Views: 1781

2 modeling positions at California Department of Water Resources (Deadline Feb22)

Department of Water Resources has two jobs in the Delta Modeling Section with nearly identical listings. They have the capacity to be anywhere from entry level to mid-level. These are interesting posts, investigating the future of the Sacramento San Joaquin Delta under sea level rise, effects of res...
by zhzhlin
Thu Dec 03, 2015 6:24 am
Forum: ROMS Problems
Topic: forrtl: severe (174): SIGSEGV, segmentation fault occurred
Replies: 24
Views: 18550

Re: forrtl: severe (174): SIGSEGV, segmentation fault occurr

I have got similar errors a few weeks ago and it was due to stackspace exhaustion. I added -heap-arrays to the fortran compiler and it solved the issue. I'm not sure if this is your case, but if you don't see anything wrong with the code, it may be something worth trying. There is a post online expl...
by zhzhlin
Mon Dec 23, 2013 2:51 am
Forum: ROMS Problems
Topic: How does it realize the continuity equation in ROMS?
Replies: 8
Views: 4710

Re: How does it realize the continuity equation in ROMS?

I am also doing the same calculation. I believe you can output 'pm' and 'pn' from average or history nc files. Did you check mass conservation for one grid cell?
by zhzhlin
Thu Apr 11, 2013 5:42 am
Forum: ROMS Discussion
Topic: Numerical diffusion of density gradient in stratified flow
Replies: 0
Views: 1284

Numerical diffusion of density gradient in stratified flow

Just wondering if anyone knows which advection scheme is better for preserving vertical density gradient in stratified flow? I am using TS_U3HADVECTION and TS_C4VADVECTION, and it seems that they are not doing a great job.
by zhzhlin
Thu Feb 07, 2013 2:17 am
Forum: ROMS Tools and Techniques
Topic: UTM to geographical coordinates
Replies: 4
Views: 5179

Re: UTM to geographical coordinates

It seems that the new version of Matlab(2012a onward) has a function 'minvtran' to do the job.
by zhzhlin
Tue Jan 29, 2013 3:10 am
Forum: ROMS Discussion
Topic: How to calculate the residence time
Replies: 5
Views: 9704

Re: How to calculate the residence time

It is true that the dye may re-enter the domain after it's flushed out. I think a practical way to deal with it is to define residence time at each location as the time it takes for the dye concentration to FIRST go below 1/e of the initial value. The dye might get re-entrained back into the domain,...