Parameters for TrachytopeParameters for Trachytopehttps://oss.deltares.nl/c/message_boards/find_thread?p_l_id=1806765&threadId=5139172020-10-21T16:00:33Z2020-10-21T16:00:33ZRE: Parameters for TrachytopeLouise S.https://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=33459492020-10-01T11:04:46Z2020-10-01T11:04:46ZGlad to help you in this please do share the detail that would be more understandable. The people who need the <a href="https://essay-reviewer.com/writemypaper4me-org-review/">writemypaper4me org reviews</a> updates can grab them here and boost their knowledge while following. Thumbs to everyone for the tremendous educational material.Louise S.2020-10-01T11:04:46ZRE: Parameters for TrachytopeBert Jagershttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=5244172014-11-07T15:14:04Z2014-11-07T15:12:24ZHi Jessica,<br /><br /><div class="quote"><div class="quote-content"><br />1. Do I need to specify multiple vegetation types for the same area in order to have it vary as a function of water level? For example, a platform with a maximum vegetation height of 1m would have a total of 10 vegetation types specified, where each type has a vegetation height that increases by 10 cm intervals?<br /></div></div><br /><br />It is not clear to me <strong>what</strong> you want to vary as function of water level.<br /><br />If you specify one vegetation class of 1m high, water will flow through the vegetation if the depth is less than 1m, and it will start flowing through and over the vegetation if the depth is larger than 1m.<br /><br />If you specify ten vegetation classes of 10cm, 20cm, ... 1m each representing 10% of the cell area, then you will be modelling an area with different types or ages of vegetation. At a depth 35cm, the 30% of the cell will have vegetation that is submerged, while the other 70% of the vegetation still extends through the water surface and hence the flow feels for these "plants" only the stems (up to 35cm).<br /><br /><div class="quote"><div class="quote-content"><br />2. Can someone please tell me what each parameter is in the following example definition file? There are 6 columns...what do each represent?<br />1 154 3 1.15 1.00 35.4<br /></div></div><br /><br />The first number indicates the <strong>trachytope number</strong> (say land use class, or roughness class). In the area file you will refer to this number.<br /><br />The second number indicates the <strong>formula number</strong> to be used. In this case "154" points to the "Baptist 2" formulations with split flow resistance and bed roughness.<br /><br />The remaining coefficients depend on the formula number. The meaning of these parameters is given by the table included in Appendix B.17.1 of the Delft3D-FLOW manual with reference to the equations given in Section 9.11.2. The numbers in your example should be interpreted as vegetation of 3 meters high [hv] with an accumulated stem diameter [n] of 1.15 meter (e.g. 23 stems of 5cm diameter) per meter squared, a dimensionless drag coefficient [cd] of 1, and an alluvial bed roughness [Cb] of 35.4 m^{1/2}/s.<br /><br />Best regards,<br /><br />BertBert Jagers2014-11-07T15:12:24ZParameters for TrachytopeJessica Chassereauhttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=5139162014-10-22T19:34:31Z2014-10-22T19:34:31ZHello Delft3D community!<br /><br />I would like to use trachytopes to incorporate vegetation roughness as a function of water level/depth. I have two questions:<br /><br />1. Do I need to specify multiple vegetation types for the same area in order to have it vary as a function of water level? For example, a platform with a maximum vegetation height of 1m would have a total of 10 vegetation types specified, where each type has a vegetation height that increases by 10 cm intervals?<br /><br />2. Can someone please tell me what each parameter is in the following example definition file? There are 6 columns...what do each represent?<br /><br />1 154 3 1.15 1.00 35.4<br /><br />Thanks!<br /><br />Jessica Chassereau SullivanJessica Chassereau2014-10-22T19:34:31Z