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hoysyau

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Everything posted by hoysyau

  1. Hi there I've been reading the 2010 version of the manual with regards to how Form Loss Coefficients (FLC) are modeled if a polygon is used for a 2d_lfcsh layer to represent bridges. Below is an extract of how TUFLOW addresses FLC for lfcsh polygons: "Polygon: FLC is the form loss per metre length (in the predominant direction of flow). FLC values are not dependent on the flow width, but are on the length of travel in the direction of flow." Say, with the values below: Below obvert FLC value of 0.2 (typical) Bridge length (perpendicular to direction of flow) is 40m Bridge deck width is 10m The length (40m) of the bridge is not used and that the FLC value in the "L1_FLC" input box would be 0.2/10=0.02 Is my understanding correct? This would mean that a constant value (0.02) is applied for each cell bounded by the polygon? Is there a way to check whether the correct FLC values have been applied? edit: found it, was part of the check files I presume logically the 100% blocked bridge deck would have a L2_FLC value of zero. Does anyone have any guidance regarding L3_FLC values (the rails)? Thanks Yau
  2. Hi all I have done a search on whether it is possible to use the information directly from a grid file (*.grd) as the bed roughness input for TUFLOW. We have been provided a roughness raster grid provided in TAB format which contains 1/n values. The TUFLOW manual recommends however, that the surface roughness be set using the the standard method of creating regional polygons with a set material code and referenced to a TMF file. From the few topics I've seen, it appears that the command "READ MI CNM ==" is the way to go. I have exported the grid file using Vertical Mapper into a TAB file and then exported it as MIF. Can someone advise on the following: - are there additional commands required in the TGC and TCF files in addition to the "READ MI CNM"? - What is the table structure of the CNM tab file? - I suppose the other material commands lines such as READ MI MAT and the reference to the TMF file (as per the standard method) should be commented out? Thanks for any assistance, in particular the steps required.
  3. Hi all No responses? Maybe I'm asking my question wrong. How do you all experts bring in design information directly from 12d? What's your proven way to bring in string lines and point elevations without having to fiddle with the information much? Sorry if I sound like a broken record, but no one in my organisation knows TUFLOW/MAPINFO very well. So the forum is my best option. Thanks for any responses.
  4. Hi there Just thought I'd bump this thread as I'm having issues importing alignment information from 12d into Mapinfo to creates zlines representing a highway embankment across a floodplain. I can be considered as a novice to TUFLOW, Mapinfo as well as 12d, so detailed instructions would be most appreciated. I've looked at the comments in this thread and despite what I do, elevations are not carried over. I've tried: - using Tools>Universal Translator (direct conversion from DXF into a TAB file), gives me the polylines and vertices in Mapinfo as under UTranslator.jpg BUT elevation remains as zero (dxf confirms to have 3D elevation) - using Table>Import (dxf source) with 'Preserve Attribute Data' and 'Store Elevations' ticked as per recommendations in this thread. I get a DXF Import Warning saying 'no attibutes found' (screenshot attached as Error Msg.bmp). The result in Mapinfo is as per the UTranslator.jpg but missing the vertices The only option I've found which worked using a dxf export from 12d is to convert the dxf into an ASCII text file (using the free software mentioned in this thread) and then open it in Mapinfo as an ASCII (using File>Open) which opens the x,y,z info within a browser window. From here I then use Table>Create Points to turn it into a TAB file. This leaves me with just points which I then copy into the _2d_zline* layer and I rearrange the Table Structure to suit. It works but awfully time consuming. I've also tried exporting the 12d data into a 12da file and using the 12da_to_from_mif. exe utility. No matter what I do, I always get an error and it refuses to complete. We're using 12d v9 here. I'm sure I'm doing something wrong or missing some bits. Can anyone assist please? Many thanks in advance. Regards Hoy Error_Msg.bmp
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