Bottom roughness coefficient as a function of water depthBottom roughness coefficient as a function of water depthhttps://oss.deltares.nl/c/message_boards/find_thread?p_l_id=1806765&threadId=556782019-07-15T21:58:22Z2019-07-15T21:58:22ZRE: Bottom roughness coefficient as a function of water depthBo Jianghttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=1755322012-08-15T07:58:30Z2012-08-15T07:58:30Zhi Joao,<br /><br />nope...i am trying to modified the bed roughness to be a function of sediment concentration which is a time series of input value. Therefore, the bed roughness should also be changing with time. <br />thanks!Bo Jiang2012-08-15T07:58:30ZRE: Bottom roughness coefficient as a function of water depthJoão Lencart e Silvahttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=1597822012-06-26T10:54:24Z2012-06-26T10:53:49ZDear Bo,<br /><br />When you say your bottom roughness is a function of time can you tell me if this function is strictly dependent on water depth (free-surface elevation + depth at that point) or some other formulation?<br /><br />João.João Lencart e Silva2012-06-26T10:53:49ZRE: Bottom roughness coefficient as a function of water depthBo Jianghttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=1575802012-06-19T11:08:29Z2012-06-19T11:08:29ZDear Khalid,<br /><br />I am currently also working on a project which requires to specify the time varying bottom roughness information. I just wonder have you successfully modified the code? <br /><br />Rgds,<br />John ChiangBo Jiang2012-06-19T11:08:29ZRE: Bottom roughness coefficient as a function of water depthJoão Lencart e Silvahttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=864542011-10-17T08:43:01Z2011-10-17T08:43:01ZDear Khalid,<br /><br />The Manning and Colebrooke-White bottom roughness parametrisations, unlike the Chezy are a function of water depth.<br />See discussion of the parametrisations in Soulsby (1998), Dynamics of Marine Sands, Volume: 249pp, Publisher: Thomas Telford.<br />Please see the D3D-flow manual for application of such parametrisations.<br /><br />I used D3D and the Colebrooke-White in an article of Maputo Bay, Mozambique:<br />Lencart e Silva J.D., Simpson J.H., Hoguane A.M., Harcourt-Baldwin J-L. (2010) Buoyancy-stirring interactions in a subtropical embayment: A synthesis of measurements and model simulations in Maputo Bay. African Journal of Marine Science. 32, 1, 95-97.<br /><br />Another example using the Manning (not with D3D) in the Ria Formosa, Portugal can be seen in:<br />J. M. Dias, M. C. Sousa, X. Bertin, A. B. Fortunato, A. Oliveira, (2009). Numerical modeling of the impact of the Ancão Inlet relocation (Ria Formosa, Portugal). Environmental Modelling and Software 24(6): 711-725João Lencart e Silva2011-10-17T08:43:01ZRE: Bottom roughness coefficient as a function of water depthAdri Mouritshttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=589022011-09-09T07:33:34Z2011-09-09T07:33:34ZHi Khalid,<br /><br />Attached is an example testcase. File "straight.df" contains one vegetation type. You can add as much types as you want in this file, one type per line. File "straight.aruv" contains one region (the full domain) refering to a type of vegetation. You can add as much regions as you want in this file (each referring to a vegetation type), one region per line.<br /><br />By using regions, you can use this also for huge domains.<br /><br />Regards,<br /><br />AdriAdri Mourits2011-09-09T07:33:34ZRE: Bottom roughness coefficient as a function of water depthKhalid Al-Asadihttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=587352011-09-08T19:59:26Z2011-09-08T19:59:26ZHi Adri,<br />Thank you for your help. I'm trying to use the Tracytope. I read section B.17 in the manual, could you please help me to find more details about the calibration file and the area file ,specially the area fraction, and how can I write these files for huge domain?<br /><br />Thanks<br /><br />KhalidKhalid Al-Asadi2011-09-08T19:59:26ZRE: Bottom roughness coefficient as a function of water depthAdri Mouritshttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=564932011-08-30T07:31:08Z2011-08-30T07:31:08ZHi Khalid,<br /><br />I think you have to zoom out in your internet browser. For some reason this "site-maintenance-tool" we're using does not wrap text when it does not fit in your window.<br /><br />Anyway, the files I mentioned in my previous post are:<br />trtrou.f90 in directory compute and trisol.f90 in directory main.<br /><br />Regards,<br /><br />AdriAdri Mourits2011-08-30T07:31:08ZRE: Bottom roughness coefficient as a function of water depthKhalid Al-Asadihttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=564572011-08-29T18:41:05Z2011-08-29T18:41:05ZDear Adri,<br /><br />Thank you for your help. I'm trying to simulate a marsh area with time varying bottom roughness. Could you please write again the subroutines' names because I think their names are not complete. For instance you wrote :<br /> <br /> "https://svn.oss.deltares.nl/repos/delft3d/trunk/src/engines_gpl/flow2d3d/packages/kernel/src/compute<br />and <br />"https://svn.oss.deltares.nl/repos/delft3d/trunk/src/engines_gpl/flow2d3d/packages/kernel/src/main<br /><br /><br />, the above locations are folders contain many subroutines.<br /><br /><br />KhalidKhalid Al-Asadi2011-08-29T18:41:05ZRE: Bottom roughness coefficient as a function of water depthAdri Mouritshttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=562722011-08-26T13:52:45Z2011-08-26T13:52:45ZHi Khalid,<br /><br />Currently it is not possible to prescribe time varying bottom roughness.<br /><br />What exactly do you want to model? May be you can use trachytopes, see section B.17 in the manual.<br /><br />If you really want time varying bottom roughness: it's open source. Have a look at subroutine "https://svn.oss.deltares.nl/repos/delft3d/trunk/src/engines_gpl/flow2d3d/packages/kernel/src/compute/trtrou.f90".<br />You can add a call at the beginning of each half time step in subroutine "https://svn.oss.deltares.nl/repos/delft3d/trunk/src/engines_gpl/flow2d3d/packages/kernel/src/main/trisol.f90" to a new subroutine, where parameters cfurou and cfvrou get new values.<br /><br />Hope this helps.<br /><br />Regards,<br /><br />AdriAdri Mourits2011-08-26T13:52:45ZBottom roughness coefficient as a function of water depthKhalid Al-Asadihttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=556772011-08-20T21:23:37Z2011-08-20T21:23:37ZHello,<br /><br />As I know in Delft3D until now, the bottom roughness coefficients (uniform or variable values) remain constant for the whole time steps. Is there any way can be used to incorporate a formula to calculate the bottom roughness coefficients at each time step? For instance. In my case study, the bootom roughness coefficient at any grid point varies at each time step and it is a function of water depth.<br /><br />Thanks <br /><br />KhalidKhalid Al-Asadi2011-08-20T21:23:37Z