WGEN Weather Simulator

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    Jason

    Model version 1.015 released on 4 Jan, 2019

    Version Report

    1. Added clarification to some element descriptions
    2. Changed the random number generator for determining wet/dry states in the Markov model from a Random Choice element to a stochastic with Uniform distribution.
    3. Added ability to override the random numbers with a user-defined value for the purposes of validation, if it is needed (so you can predict the outcome).
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    Jason

    Model version 1.020 released on 11 Jan, 2019

    Version Report

    1. Corrected the label for observed rain, which was mislabeled as "observed radiation" and placed in the radiation portion of the inputs. This change doesn't affect the model output.
    2. Hard-code in deterministic values so that user only needs to turn it on or off to debug in deterministic mode
    3. Minor clarifications in documentation of temperature calculations
    4. Some textbooks define the scale factor for the gamma distribution differently. Some use the notation of lambda and this is 1/beta. Clarified in the documentation.
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    Jason

    Model version 1.024 released on 25 Jan, 2019

    Version Report

    The harmonic value "x" in the temperature container should have an initial condition of vector(0) unless you are running it deterministically for verification purposes. This has been fixed using an IF statement: 

    if(Temp_Determ, vector(-0.3513, -1.754, 0.6244), vector(0))

    Where "Temp_Determ" is set to False by default. Only set this to True if you need to run a deterministic validation run.

    I was using a Random Choice element for determining the wet/dry state but it's not possible to use this if you want to switch to a deterministic run for validation. I rolled this back to an earlier version of the markov function that uses a stochastic with uniform distribution instead. This is how the FORTRAN code is implemented.

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    Jason

    Model version 1.025 released on 7 Feb, 2019

    Version Report

    1. Fixed random number generator in markov rain model. The stochastic element used to generate random numbers in the rainfall container was not set to trigger daily. The trigger was added.
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    Jason

    Model version 1.026 released on 6 Mar, 2019

    Version Report

    1. Precipitation chart was missing from the dashboard. This Result was added back in and placed on the dashboard.
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    Jason

    Model version 1.029 released on 13 May, 2019

    Version Report:

    1. Added support for units so that data can be entered in terms of metric or English units.

    2. Added results to support the differences in units

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    Jason

    Model version 1.031 released on 11 September, 2019

    Version Report:

    1. The x axis for the top 2 charts on the dashboard is redundant because the bottom chart axis can apply to all 3. Removed x axis on top to charts.
    2. Changed the title shown on the dashboard.
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    Jason

    Model version 1.035 released on 17 December, 2019

    Version Report:

    1. Applied units to main outputs (precip, min/max temp, and radiation)
    2. Result plots were updated
    3. Verification tests and charts were updated with units change

    These changes did not affect the underlying calculations in any way but make it easier to port the model to another model, which will need to carry those unit dimensions forward.

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    Natalia Vieira

    hi! i can't download de WGEN PAR model, can you please help me?

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    Jason

    Natalia,

    Can you tell me what happens when you attempt to download that model? Here is the link to the article with the download link at the bottom: WGEN Parameter Generator – GoldSim Help Center

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    Fernando Laqui

    hi jason, how could i modify the input parameters manually. Since it is currently only as reading

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    Rafay Sheraz

    sir kindly guide how to download and start this WGEN generator model in my laptop.

     

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    Jason

    @fernando, you should be able to enter values on the dashboard manually. Are you having trouble doing so?

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    Jason

    @Rafay,

    You need a GoldSim software license to use this model. If you are a student, you can apply for a free academic license from here: GoldSim Academic Application Form - GoldSim

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    Rafay Sheraz

    Currently I am facing this error while running the model. please guide me how to resolve it.

     

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    Jason

    Rafay,

    As per our discussion in our support ticket, it appears the issue was resolved by changing the name of 1 or more of the sheets in your Excel file. Is that right?

    -Jason

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    Jason

    Version Report:

    Version 1.045

    1. Fixed an issue that occurs when dealing with negative temperature values. Convert all temperature data to Kelvin on the front end before performing all calculations. Outputs are converted back from Kelvin on the back end.
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    Jason

    Version 1.047

    Temperature input parameters set in terms of C or F, depending on the user's unit type selection.

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    Jason

    Version 2.005

    The new version of GoldSim now runs using a saved input file called "WGEN PAR.xlsx". You can generate this file using the companion GoldSim model "WGEN PAR.gsm". In this new version, you should not need to change any inputs. But you can replace the Excel inputs with static data inputs for faster running in your project. Let me know if you see any problems. 

    This version was tested using applications at the following locations:

    • Seattle, WA
    • Columbia, MO
    • Los Angeles, CA
    • Minneapolis, MN
    • Salt Lake City, UT
    • Victoria, Australia
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    Jason

    Updated version of WGEN (version 2.020) released:

    • Changed model back to support only metric units because it was getting too complicated supporting the switch of units. WGEN PAR is also only working in metric units too so it should be straightforward to link the results of PAR over to WGEN. This change simplifies the interface and some of the functions that handle the incoming time series and static inputs.
    • Improved the wet and dry day counter by adding a monthly reset generated by a discrete change.
    • Improved the temperature peak and valley reporting.
    • Corrected the verification plot for run of wet days
    • Corrected some verification chart legends
    • Put more verification plots on the dashboard

     

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