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Sacramento Model Calibration

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

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  1. NWS Calibration Workshop, LMRFC March, 2009 slide - 1

  2. 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 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

  3. Conceptual Representation of SAC-SMA NWS Calibration Workshop, LMRFC March, 2009 slide - 3

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  8. (each Dt) NWS Calibration Workshop, LMRFC March, 2009 slide - 8

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  11. Sacramento Model - Percolation • 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

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  15. Why no percolation here? When is percolation at the max rate? NWS Calibration Workshop, LMRFC March, 2009 slide - 15

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  21. Direct RO = UZTW Excess Fracdir ADIMP NWS Calibration Workshop, LMRFC March, 2009 slide - 21

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  24. NWS Calibration Workshop, LMRFC March, 2009 slide - 24

  25. LZTWC NWS Calibration Workshop, LMRFC March, 2009 slide - 25

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  30. Dry areas: evapotranspiration assumes ‘connection’ between upper and lower zones NWS Calibration Workshop, LMRFC March, 2009 slide - 30

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