PEST calibration instruction file

[Chang Liao]

The PEST inputs file--instruction file, which PEST uses to read the model outputs, requires that model output file should be no more than 2000 characters in width.

But my modflow model output file, the head file, exceeds that limit. So what is the option to get over this constrain?

What comes in my mind is either using another package to save to desired head into another shorter output file or adding post-process utility to reduce the characters.

Has anyone encountered this problem before?

[Simon Woodward]

Isn’t the HDS file a binary file? Or do you mean a different file.

From the PEST manual page 3-10:

“If your model produces only  binary files, you will

need to write a simple program which reads this binary data and rewrites it in ASCII form;”

 

 

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[Chang Liao]

MODFLOW could output both ascii or binary format files, which is controlled using the OC package.

I found another way out by reducing the line characters count using the FORMAT keyword in OC package. It is simply a Fortran format controls.

Now the the instruction file could read the output directly. 

Since format strictly follows the spaces, it is actually better for PEST to read since I can directly direct PEST to read exact column.