Water level errorWater level errorhttps://oss.deltares.nl/c/message_boards/find_thread?p_l_id=1806675&threadId=3182412021-02-27T13:17:25Z2021-02-27T13:17:25ZRE: Water level errorArnold van Rooijenhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3192322013-08-26T06:46:20Z2013-08-26T06:46:20ZHi Nophi,<br /><br />The reference level is something you can choose yourself, as long as all your model input (initial conditions, boundary conditions, bathymetry) is given with respect to the same reference level. <br /><br />If mean sea level is your reference level (which in most cases it is) you can definitely set the initial water level to zero (so you're right). Just make sure that the water levels at your boundary conditions are also relative to MSL, and of course your bathymetry should be too.<br /><br />Cheers,<br />ArnoldArnold van Rooijen2013-08-26T06:46:20ZRE: Water level errorNophi Bitonhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3188842013-08-24T12:05:32Z2013-08-24T12:05:32Z<div class="quote-title">Arnold van Rooijen:</div><div class="quote"><div class="quote-content"><br />The initial water level is the water level that you apply throughout your domain before you run your simulation. So when you start your simulations this initial water level will be influenced by water motions at your model boundary (water level variations, currents), wind and/or waves.<br /></div></div><br /><br />Thanks for answering my question, now you say its the water level throughout the domain, water level in reference to what (mean sea level)? so does it mean I can use an initial water level condition equal to zero (assuming the water level is the mean sea level)? Am I getting it right? then if not what is the basis of inputting an initial water level condition?<br /><br />thanks a lot for answering my question, I appreciate your help.<br /><br />thanks <br />NophiNophi Biton2013-08-24T12:05:32ZRE: Water level errorNophi Bitonhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3188802013-08-24T12:06:27Z2013-08-24T11:57:26ZThanks a lot for the suggestion, you're right I observed the points mentioned in the error and indeed those are with abrupt change in depth.<br /><br />Thanks a lot this forum is really giving me a lot of help learning delft3D<br /><br />NophiNophi Biton2013-08-24T11:57:26ZRE: Water level errorQinghua Yehttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3185852013-08-23T15:21:03Z2013-08-23T15:21:03ZHi Nophi,<br /><br />Also check your bathymetry as well. If there are strange deep points, the model might also be not stable.<br /><br />Greetings,<br /><br />QinghuaQinghua Ye2013-08-23T15:21:03ZRE: Water level errorArnold van Rooijenhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3184952013-08-23T11:42:28Z2013-08-23T11:42:28ZHi Nophi,<br /><br />The initial water level is the water level that you apply throughout your domain before you run your simulation. So when you start your simulations this initial water level will be influenced by water motions at your model boundary (water level variations, currents), wind and/or waves.<br /><br />The error that you got means that the water level difference between two computational timesteps is unrealistically high (so it is not with respect to your initial water level). There can be several reasons for this error, e.g,. it might be something in your boundary condition, or it could be that your computational time step is too large for the processes you are modeling.<br /><br />Cheers,<br />ArnoldArnold van Rooijen2013-08-23T11:42:28ZWater level errorNophi Bitonhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806675&messageId=3182402013-08-23T01:43:13Z2013-08-23T01:22:55ZI am trying to simulate a storm surge along a coast. <br />I have a bathymetry of the domain that ranges from 0 - 150 meters of depth (there are also some negative values for above mean sea level elevation near the coast)<br />My question is that what appropriate initial condition for water level should I use as an error saying "ERROR Water level change too high > 25.00 m (per 0.5 DT) after 30 timesteps in the following points:" ( the points mentioned are the leftmost column of the rectangular domain)<br /><br />Also is 25 meter an upper limit boundary for difference of the initial and the computed?? What does the initial water level condition really for? Is this the water level along the coast or the average for all depth along the domain??<br /><br />Can anybody help me in this forum as I am still learning this software for my research. <br /><br /> best regards,<br />NophiNophi Biton2013-08-23T01:22:55Z