The difference between them was the vertical coordinate, one sigma and theThe difference between them was the vertical coordinate, one sigma and thehttps://oss.deltares.nl/c/message_boards/find_thread?p_l_id=1806765&threadId=3212832020-11-25T19:55:03Z2020-11-25T19:55:03ZRE: The difference between them was the vertical coordinate, one sigma andAdri Mouritshttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=3228392013-09-04T15:32:46Z2013-09-04T15:32:46ZHi Luis,<br /><br />That looks very weird indeed.<br /><br />Although both calculations are with one layer, the actual algorithms are really different. The Z-layer algorithm is more explicit.If you use the same timestep for both simulations, I expect the sigma-model to produce better results, which does not seem to be the case.<br /><br />What happens if you reduce the time step?<br /><br />If you scan the output between t=0 and t= 15 days, is there a point in time and/or space where it starts to become ugly?<br /><br />Regards,<br /><br />AdriAdri Mourits2013-09-04T15:32:46ZThe difference between them was the vertical coordinate, one sigma and theLUIS HENRIQUE SILVAhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=3212822013-08-30T15:57:46Z2013-08-30T15:57:46ZDear Adri,<br />I carried out two experiments, both forced by tide (amplitude and phase)<br />prescribed at a file *.bca. Both with 1 layer, size 92X91, barotropic. The<br />difference between them was the vertical coordinate, one sigma and the<br />other Z.<br /><br />I think the results should be the same, but they are different: the run with<br />sigma coordinate was noisy ... Please, have a look in the figures, where the<br />water level is shown after an integration of 15 days.<br /><br />Do you know what is happening ?<br /><br />regards<br /><br />LuisLUIS HENRIQUE SILVA2013-08-30T15:57:46Z