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Calibration of Other Attributes

Hi

Does any one agree with me that some attributes like Diameter (of Pipes) or Bulk & Wall Reaction rates or ... can be calibrated using Residual Chlorine, Trace and other scenarios and tools in WaterGEMS? For example, with residual chlorine can calibrate some attributes like Bulk & Wall Reaction rates. It (Residual Chlorine) can be got by a simple test on residual chlorine in any nodes. Or with knowing Age of water (with actual observations), Diameter of such old pipes which has no correct information can be calibrated.

Sim

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  • Here are some thoughts:

    Regarding pipe diameters: these can affect water quality in terms of the time it takes for a change in water quality to propagate through the system but for the most part those effects are pretty small.

    You will still need to know the source of error so Calibrator knows the right things to try adjusting. Finding that source of error is something that the engineer needs to do first and tends to be the majority of the work in calibration. Without focusing Darwin's efforts on the source of error, performance and results would not be efficient; Calibrator can work very well once the source of error is known.

    Regarding calibrating bulk and wall reaction rates based on observed chlorine residual: that sounds like it might be feasible, but you'd have to start with a model that was already hydraulically calibrated and computing the model would be done manually since it would need to be an EPS. You might have luck searching for scholarly articles on the subject.

    Regarding water age: I don't think you'll be able to measure that in the field.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

    Answer Verified By: Sushma Choure 

  • Jesse
    Let's focus on Trace analyses:
    In typical calibration process (e.g. for attributes like Demands or Element's statuses) the software runs the model in Steady State simulation, get the actual observable values and calibrates those attributes based on these real values. In our case, the software must run Trace Analyses for all nodes in an EPS simulation, get the real observable values of Trace(%) [it can be got with local tests], and calibrates Diameters of pipes, Hazen-Williams-C (and even maybe length of pipes) simultaneous. It can get help from typical calibration results for more exact results. The difference between typical calibration and suggested calibration is duration of simulating. Running in an EPS concludes more results to get better calibration.
    About calibration of Wall & Bulk it can be done similarly.
    What is your idea?
  • Jesse
    What is your idea about last quote?
  • It is an interesting suggestion, but my previous comments still apply as a response. Traditional calibration approaches may be more feasible.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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