<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Kunal,<div class=""><br class=""></div><div class="">just a wild guess...</div><div class="">As far as I remember, imposing (northern OBCS) to points with both land and water neighbors (on the eastern and western side) can give problems when MITgcm checks the overall OBCS configuration. You should alternate N and W OBCS, but you cannot do it in your specific setup.</div><div class="">Try to start with a single northern OB point (with land on both the W and E side), check if it works (it should); then try to add more OB points, with different locations, and see what happens.</div><div class=""><br class=""></div><div class="">Good luck!</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">SQ</div><div class=""><br class=""></div><div class="">P.S.: at that resolution, surface runoff/fluxes is a sound (and much easier) alternative.</div><div class="">P.P.S.: I think it is better to mask out those shallow isolated points/areas ("ponds") in the NE corner of your figure: they don't communicate with your main basin and they can be prone to unrealistic "extreme" conditions (e.g., overheating in summer).</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 25 Aug 2021, at 15:07:23, kunal madkaiker <<a href="mailto:kunal.madkaiker02@gmail.com" class="">kunal.madkaiker02@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Dear All,</div><div class=""><br class=""></div><div class="">I have a complicated topography on the northern side (fig2.gif attached), which I need to keep open. I am forcing in XZT (660*48*31) direction, where the first 550 points are zeros. <br class=""></div><div class=""><br class=""></div><div class="">The error I get is:</div><div class="">(PID.TID 0000.0001) *** ERROR *** OBCS_CHECK: 58 errors in OB location vs Mask<br class="">(PID.TID 0000.0001) *** ERROR *** S/R ALL_PROC_DIE: ending the run</div><div class=""><br class=""></div><div class="">I have referred closely to <a href="https://mitgcm.readthedocs.io/en/latest/phys_pkgs/obcs.html#fig-obcsexample" class="">https://mitgcm.readthedocs.io/en/latest/phys_pkgs/obcs.html#fig-obcsexample</a> but I am unable to prescribe NOBC properly. <br class=""></div><div class="">As explained in the example, when I prescribe values on the LAST land point of bathymetry, model runs properly but I don't see the effect of the OB cascading on S,T,U,V (seems like no NOBC given). <br class=""></div><div class="">When I force values on the immediate wet points below, I get the above error. <br class=""></div><div class=""><br class=""></div><div class="">If I change OBCSfixTopo=.TRUE., to FALSE, errors increase from 58 to 63. I am not understanding how/why the model is showing 58 errors out of the 111 boundary points.</div><div class=""><br class=""></div><div class="">Currently, I have commented the OBNFiles and prescribed ref values through obcs_calc.f (s=0, t=20, u=0, v=-1)</div><div class=""></div><div class="">Attaching my data.obcs, STDOUT.0000 files. Also, I have listed bathymetry values for (I=549:660) along the northern boundary which I am attaching (Bay.txt).</div><div class="">Kindly assist.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Kunal<br class=""></div></div>
<span id="cid:f_ksriedgl4"><Bay.txt></span><span id="cid:f_ksrh2n7h0"><fig2.gif></span><span id="cid:f_ksri3ulx2"><STDERR.0000></span><span id="cid:f_ksri3ull1"><data.obcs></span><span id="cid:f_ksri3umb3"><STDOUT.0000></span>_______________________________________________<br class="">MITgcm-support mailing list<br class=""><a href="mailto:MITgcm-support@mitgcm.org" class="">MITgcm-support@mitgcm.org</a><br class="">http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support<br class=""></div></blockquote></div><br class=""></div></body></html>