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Chris.Huxley

Model Validation/Calibration Tips

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Question:

I wish to calibrate my model to a historic event. What is the best (most efficient) way to compare recorded results against model results?

 

 

 

 

 

Answer:

Here are a number of tips which may be useful during model calibration/validation:

 

1) Time Formatting: During calibration modelling it is often convenient to run simulations using isodate format. Isodate format uses date/time specifications to define the model simulation start and end time (instead of hours)

 

Example Syntax:

 

time format == ISODATE

start time ==  26/03/2010 16:30:00   

end time ==   01/04/2010 23:00:00

 

TUFLOW FV WIKI Examples:

- Tutorial Module 3 for a worked model example: http://fvwiki.tuflow.com/index.php?title=Tutorial_Module03

- How to configure Excel to use isodate format correctly: http://fvwiki.tuflow.com/index.php?title=Boundary_Condition_Input_Format

- How to configure the time settings in SMS to display the result time values correctly: http://fvwiki.tuflow.com/index.php?title=SMS_Tips#Changing_SMS_Time_Settings_.28Hours_to_Isodate.29

 

2) Point Result Output: Calibration typically requires comparison of model results to a time series of recorded data at a specific location. The output file will include the suffix, “POINTS.csv”: ("FMA2_Hydro_002_POINTS.csv"

 

Example Syntax:

 

output == points

     output points file == ..\GIS\Output_Points.csv                    !csv file containing list of point x,y coordinates

     output parameters == h                                                          !water level only

     output interval == 900.                                                           !seconds

end output

 

TUFLOW FV WIKI Examples:

http://fvwiki.tuflow.com/index.php?title=Tutorial_Module03#Hydrodynamic_Simulation_Results

 

3) Peak Value Results: Calibration may require comparison of model results to a large number of recorded peak values (eg. flood debris marks) within a study area. This is best done using the model time series *dat or *netcdf results. TUFLOW FV currently doesn’t automatically output the maximum result values (this functionality will be included in the next software release), instead, a series of post processing steps are required to extract the peak/maximum values from the time series *dat or *netcdf results via

 

Example Syntax:

 

output == datv

   output parameters == h                                               !water level only

   output interval == 900.                                                 !seconds

end output

 

TUFLOW FV WIKI Examples:

- Extracting the maximum value using SMS: http://fvwiki.tuflow.com/index.php?title=SMS_Tips#Data_Calculations

- Extracting the maximum value using TUFLOW Utilities:

  1. RES_to_RES: http://fvwiki.tuflow.com/index.php?title=RES_to_RES#Max
  2. TUFLOW_to_GIS: http://fvwiki.tuflow.com/index.php?title=TUFLOW_to_GIS#Converting_to_grids

 

4) Flux/Flow Rating: Model calibration sometimes requires comparison of model flows against recorded ratings. This is already addressed in the following forum post:   

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