Combing Sea Surface Height (SSH) with Tidal forcing https://dlt-acc.firelay.cloud/c/message_boards/find_thread?p_l_id=3231581&threadId=5600100 2026-05-15T21:43:54Z 2026-05-15T21:43:54Z Russell Lee Lee Nasrallah https://dlt-acc.firelay.cloud/c/message_boards/find_message?p_l_id=3231581&messageId=5600099 2023-01-18T00:02:29Z 2023-01-18T00:02:29Z

I am currently trying to add SSH to an astronomic tidal signal in Delft3D4. <br />I have a single offshore boundary and within that, I have included the two water level forcing signals. One is driven by Astronomic constituents. The other is a time series gathered from CMEMS. <br /><img src="https://dlt-acc.firelay.cloud/documents/portlet_file_entry/3230934/image--tempRandomSuffix--PcVEpcxG.png/ec726132-8ca6-0221-69c4-d24c5ba70adb" /><br /><br />When I run the simulation, however, the results do not seem to be the combination of these two signals. The tidal signal does not seem represented at all (See below). <br /><br /><img src="https://dlt-acc.firelay.cloud/documents/portlet_file_entry/3230934/image--tempRandomSuffix--qurCtTMh.png/165a82fc-146d-c5f1-5382-f95483c211d6" /><br /><br />My assumption was that the two signals would be added together and the resulting signal would be forced at the boundary. <br /><br /><br />Any ideas on why this might not be working? <br /><br />I&#39;ve included the PLI and BC files below. 

Russell Lee Lee Nasrallah 2023-01-18T00:02:29Z