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John Howlett

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John Howlett last won the day on October 25 2011

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About John Howlett

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    SMS Expert

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    Male
  • Location
    Houston, TX
  • Interests
    Arctic, Geotechnical, Marine, Port, Coastal, Ocean, and Structural Engineering

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  1. PTM Trap Error

    Lauren, What version of SMS and PTM are you using? An updated version of SMS 10.1 and the PTM model will be posted soon. I believe a problem was fixed recently where the first (x,y) point would be repeated in the trap file so there was one extra point per trap. Until the new version is posted, you may want to check if this is what is causing the problem. - John
  2. How can I stored my field results in the .sol file?

    Let me see if I understand You have a .geo file with linear or quadratic elements You have a .sol file with a value for each node in the .geo file When you read in the .sol file after reading in the .geo file you get an error message saying, "THE SOLUTION FILE DOES NOT MATCH THE MESH" I believe we will need to take a look at your files. Please send them to technical support.
  3. Jose, What is the build date of the version of SMS you are using (See Help | About)? Thank you, John
  4. uncontrolled spillway exit

    Have you tried to represent the structure as part of the mesh? SRH-2D is very stable and I believe you should be able to add the spillway to the mesh. Once the spillway is part of the mesh (and has the proper elevation assigned), the water will only flow over the crest when the water surface elevation exceeds the crest. The boundary conditions you inquired about are described in the manual as follows, but I would try adding the spillway to the mesh. EXIT-H: It is a downstream exit boundary with a subcritical flow. Water surface elevation should be specified at this boundary along with the unit. For a steady state simulation, a real positive value is the input as a constant water surface elevation (therefore, elevation below zero is not allowed in SRH-2D). For an unsteady flow, a negative integer, -n, is the input. The integer, n, refers to the data function specified in the “DATA_FILE_0n” in the Global Parameter setup. If it is a time series function, time(hour) versus elevation(ft or meter) is the input data; if it is a general function, discharge(cfs or cms) versus elevation(ft or meter), the rating curve, is the data. The unit of the data is also specified: 1 for feet and cfs and 2 for meters and cms. EXIT-Q: It is a downstream exit boundary with a known discharge where the water flows out of the domain. The input is the same as INLET-Q: discharge and unit. Caution: at least one EXIT-H is needed for modeling and EXIT-Q is intended only for cases with multiple exits. It is preferable that EXIT-H is the main exit and EXIT-Q is only a secondary exit with a small flow discharge. EXIT-EX: It is a downstream exit boundary where the flow is supercritical. No boundary conditions are needed at such exits, neither discharge nor water surface elevation.
  5. Creating bathymetric set from feature arcs

    Simo, In addition to the tutorial Rusty mentions, there is a brief description of feature stamping on the documentation wiki: http://xmswiki.com/xms/SMS:Feature_Stamping - John
  6. SMS 10.0 / SRH2D Monitoring Line

    Please send your files to Technical Support and I will take a look at them. The previous posts pretty much cover any suggestion I could offer without looking at your files. When you send the files, tell them John Howlett wanted to look at them. Also, for the SRH-2D users out there - We have been working with Yong Lai, the developer of SRH-2D, on changes to SRH-2D that will allow the model to write the model output as XMDF files. This should make post-processing in SMS easier in the future. - John
  7. STWAVE problems with 10.1

    MO, The interpolation issue has been resolved. Any versions of SMS created after 2009-10-30 will no longer have this issue.
  8. Joel et al, This problem has been resolved in the latest version of SMS 10.1.
  9. run adcirc had a problem?

    You may want to send this question to the ADCIRC Listserv, which is monitored by the developers of ADCIRC and other ADCIRC users. Instructions on how to join are posted at the ADCIRC website (http://www.adcirc.org).
  10. ADCIRC outputs for PTM

    Lauren, Unfortunately the model PTM does not have an option to loop or extrapolate hydrodynamic data. Depending on what model your hydrodynamic output is from, it may be possible to manually alter the file to add additional timesteps. - John
  11. Merging Meshes

    You may find the following post helpful: http://aquaveo.invisionzone.com/index.php?showtopic=379 See the PDF posted towards the bottom.
  12. What models in SMS can simulate oil spill on river

    Thread continues at http://aquaveo.invisionzone.com/index.php?showtopic=810
  13. GMS 7.0.2 and Windows 7 64bit Pro

    Thank you for the information. We are working to support Windows 7. I will pass along the information you found to those in charge of building the installation packages.
  14. What models in SMS can simulate oil spill on river

    SMS does not currently have a model for modeling oil spills. Although the RMA4 manual suggests that it can be used for this, RMA4 should not be used to evaluate highly volatile materials such as gasoline, nor materials that do not mix with water, such as oil. See http://www.xmswiki.com/xms/SMS:RMA4 The model PTM can be used for particle tracking, but again, it would provide a crude estimate at best in my opinion. You may want to investigate the NOAA oil response software program GNOME. From the NOAA website: GNOME (General NOAA Operational Modeling Environment) is the oil spill trajectory model used by OR&R Emergency Response Division (ERD) responders during an oil spill. ERD trajectory modelers use GNOME in Diagnostic Mode to set up custom scenarios quickly. In Standard Mode, anyone can use GNOME (with a Location File) to: predict how wind, currents, and other processes might move and spread oil spilled on the water. learn how predicted oil trajectories are affected by inexactness ("uncertainty") in current and wind observations and forecasts. see how spilled oil is predicted to change chemically and physically ("weather") during the time that it remains on the water surface. To use GNOME, you describe a spill scenario by entering information into the program; GNOME then creates and displays an oil spill "movie" showing the predicted trajectory of the oil spilled in your scenario.
  15. ADCIRC outputs for PTM

    Lauren, The ability to create a transient dataset from a steady state dataset is a new feature in SMS 10.1. Unfortunately, SMS 10.0 does not have this functionality.
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