HYPR Emulation (Ahmed et al., 2020) Parameters Dependency?

[Ameer]

Hello everyone,
I am using the HYPR version of HBV model and I see the following in the .rvp file

Code: Select all

:LandUseParameterList
  :Parameters,   PONDED_EXP, PDMROF_B,   DEP_MAX, MAX_DEP_AREA_FRAC,
  :Units     ,         none,     none,        mm,              none,         
  #          ,        2/PWR,        B, SMAX=CMAX*(1/(B+1)),       MAXPA,   

I see that PDMROF_B (i.e. B) is configured in DEP_MAX (i.e., SMAX) which sort of comprise its independent nature when calibrating the model. Assuming the equation for SMAX is right, CMAX and B should be calibrated, how you guys deal with a situation like this?

Thanks,
Ameer

[jrcraig]

Hi Ameer,

Sorry for the delayed response. If using Ostrich, you can use tied parameters in the OstIn.txt file to calibrate c_max directly :

Code: Select all

BeginParams
<cmax>
<pdmrof_b>
#... plus others in .rvp file
EndParams
BeginTiedParams
<dep_max> 2 <cmax> <pdmrof_b> ratio 1 0 1 1 
EndTiedParams
#this calculates dep_max = (1*cmax+0)/(1*b+1)


you then use <dep_max> in your .tpl file in the proper location