https://dlt-acc.firelay.cloud/c/message_boards/find_category?p_l_id=3231581&mbCategoryId=3346539 2026-05-15T14:22:54Z 2026-05-15T14:22:54Z Bruna Ambrosio https://dlt-acc.firelay.cloud/c/message_boards/find_message?p_l_id=3231581&messageId=3352026 2020-07-06T21:23:54Z 2020-07-06T21:19:52Z

<p style="text-align: left"><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">Hi everyone. </span></span></span></p><p style="text-align: left"><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">I&#39;m applying the Delft3D model to analyse morphodynamics processes at Fernando de Noronha Archipelago (Brazil). I&#39;ve never used numerical models for oceanic islands before and </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">I&#39;m having problems with Deft3D-FLOW validation. T</span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">he model domain includes a wide range of depths and a narrow, steep island shelf. I think these can be the complicating factors, increasing model instability. Actually, I&#39;ve been testing a </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">rectangular 2D grid with the island in the center (350 m resolution), </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">using water level boundaries and only astronomic level and uniform wind as boundary conditions. </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">I already tried to set a maximum depth to 1000 m after the bathymetry interpolation and smoothed the depths located after shelf, but even so the results do not change too much. I tested several combinations of coefficients (roughness, viscosity and wind drag), but </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">I couldn&#39;t define one that works well for the velocity components.</span></span></span></p><p style="text-align: left"><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">Has anyone had problems applying Delft3D-FLOW </span></span></span><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">for oceanic islands? Does anyone have any suggestions about the grid, bathymetry and boundary definitions? I really need help. </span></span></span></p><p style="text-align: left"><span style="color: #222222"><span style="font-family: Arial,Helvetica,sans-serif"><span style="font-size: 14px;">Thank you so much.</span></span></span></p>

Bruna Ambrosio 2020-07-06T21:19:52Z