NWS Calibration Workshop, LMRFC March, 2009                                  slide -
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Goals Unbiased reproduction of historical conditions Parameters that cause model components to mimic the hydrologic processes they were designed to represent Ability to extrapolate beyond conditions encountered in the historical record Strategy

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Sacramento model calibration

Goals slide -

Unbiased reproduction of historical conditions

Parameters that cause model components to mimic the hydrologic processes they were designed to represent

Ability to extrapolate beyond conditions encountered in the historical record

Strategy

Must account for the physics of the model and how each portion of the hydrograph was intended to be modeled

Must understand the structure of the model

Sacramento Model Calibration

NWS Calibration Workshop, LMRFC March, 2009 slide - 2


Conceptual representation of sac sma
Conceptual Representation of SAC-SMA slide -

NWS Calibration Workshop, LMRFC March, 2009 slide - 3






Sacramento model calibration

(each slide - Dt)

NWS Calibration Workshop, LMRFC March, 2009 slide - 8




Sacramento model percolation
Sacramento Model - Percolation slide -

  • Function of two forces:

  • Lower Zone Dryness (Capillary Suction Force)

  • Lower Zone Deficiency Ratio (LZDEFR)

  • Upper Zone Free Water Wetness (Gravity Force)

NWS Calibration Workshop, LMRFC March, 2009 slide - 11





Sacramento model calibration

Why no slide -

percolation

here?

When is

percolation at

the max rate?

NWS Calibration Workshop, LMRFC March, 2009 slide - 15







Sacramento model calibration

Direct RO = UZTW Excess Frac slide - dir ADIMP

NWS Calibration Workshop, LMRFC March, 2009 slide - 21





Sacramento model calibration

LZTWC slide -

NWS Calibration Workshop, LMRFC March, 2009 slide - 25






Sacramento model calibration

Dry areas: evapotranspiration assumes ‘connection’ between

upper and lower zones

NWS Calibration Workshop, LMRFC March, 2009 slide - 30