Sacramento Model Calibration
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NWS Calibration Workshop, LMRFC March, 2009 slide - 1
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NWS Calibration Workshop, LMRFC March, 2009 slide - 2
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– 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
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NWS Calibration Workshop, LMRFC March, 2009 slide - 3
Conceptual Representation of SAC-SMA
INTERFLOWSURFACERUNOFF
INFILTRATIONTENSION
TENSION TENSION
PERCOLATION
LOWERZONE
UPPERZONE
PRIMARYFREE
SUPPLE-MENTAL
FREE
RESERVED RESERVED
FREE
EVAPOTRANSPIRATION
BASEFLOW
SUBSURFACEOUTFLOW
DIRECTRUNOFF
Precipitation
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NWS Calibration Workshop, LMRFC March, 2009 slide - 4
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NWS Calibration Workshop, LMRFC March, 2009 slide - 5
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NWS Calibration Workshop, LMRFC March, 2009 slide - 6
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NWS Calibration Workshop, LMRFC March, 2009 slide - 7
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NWS Calibration Workshop, LMRFC March, 2009 slide - 8
(each t)
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NWS Calibration Workshop, LMRFC March, 2009 slide - 9
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NWS Calibration Workshop, LMRFC March, 2009 slide - 10
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NWS Calibration Workshop, LMRFC March, 2009 slide - 11
Sacramento Model - Percolation
LZFPMLZFSMLZTWM
LZFPCLZFSCLZTWCLZDEFR
0.1
Function of two forces:
• Lower Zone Dryness (Capillary Suction Force)
Lower Zone Deficiency Ratio (LZDEFR)
• Upper Zone Free Water Wetness (Gravity Force)
UZFWM
UZFWC
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NWS Calibration Workshop, LMRFC March, 2009 slide - 12
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NWS Calibration Workshop, LMRFC March, 2009 slide - 13
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NWS Calibration Workshop, LMRFC March, 2009 slide - 14
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NWS Calibration Workshop, LMRFC March, 2009 slide - 15
Why nopercolationhere?
When ispercolation at the max rate?
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NWS Calibration Workshop, LMRFC March, 2009 slide - 16
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NWS Calibration Workshop, LMRFC March, 2009 slide - 17
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NWS Calibration Workshop, LMRFC March, 2009 slide - 18
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NWS Calibration Workshop, LMRFC March, 2009 slide - 19
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NWS Calibration Workshop, LMRFC March, 2009 slide - 20
2
LZTWMUZTWMADIMC
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NWS Calibration Workshop, LMRFC March, 2009 slide - 21
Direct RO = UZTW Excess Fracdir ADIMP
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NWS Calibration Workshop, LMRFC March, 2009 slide - 23
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NWS Calibration Workshop, LMRFC March, 2009 slide - 24
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NWS Calibration Workshop, LMRFC March, 2009 slide - 25
LZTWC
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NWS Calibration Workshop, LMRFC March, 2009 slide - 26
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NWS Calibration Workshop, LMRFC March, 2009 slide - 27
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NWS Calibration Workshop, LMRFC March, 2009 slide - 28
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NWS Calibration Workshop, LMRFC March, 2009 slide - 30
Dry areas: evapotranspiration assumes ‘connection’ between upper and lower zones