Document PIHM manual calibration
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SubTasks
From Age of Water
    TypeM
    low
    ProgressM
    100%
    Start dateM
    1st Nov 2014
    Target dateM
    1st Nov 2015
    Participants
    Expertise
    calibration
    Legend: M Mandatory | States: Not defined, Valid, Inconsistent with parent
    Line 8: Line 8:
     
    Parameters controlling lateral groundwater flow are taken to be horizontal saturated hydraulic conductivity, KsatH, horizontal macropore hydraulic conductivity, MacKsatH, and macropore depth, MacD. The soil thickness, another important parameter, is held at an assumed value. Models are run forward from an initial state of completely saturated soil using all meteorological forcings (except precipitation) to capture the steepening effect of ET on the slope of the recession curve. The "observation" stream discharge is taken to be the time-dependent solution to the power law that best fits the observed stream hydrograph. The graphic solution below illustrates how the different parameters impact the shape of the modeled recession curve.
     
    Parameters controlling lateral groundwater flow are taken to be horizontal saturated hydraulic conductivity, KsatH, horizontal macropore hydraulic conductivity, MacKsatH, and macropore depth, MacD. The soil thickness, another important parameter, is held at an assumed value. Models are run forward from an initial state of completely saturated soil using all meteorological forcings (except precipitation) to capture the steepening effect of ET on the slope of the recession curve. The "observation" stream discharge is taken to be the time-dependent solution to the power law that best fits the observed stream hydrograph. The graphic solution below illustrates how the different parameters impact the shape of the modeled recession curve.
      
    [[File:Jepsen sample recession calib results.jpg]]
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    Revision as of 20:58, 3 February 2014


    Manual calibration of PIHM consists of 3 components: parameters controlling lateral groundwater flow, parameters controlling infiltration, and the snow accumulation / melt model.

    Parameters Controlling Lateral Groundwater Flow

    Parameters controlling lateral groundwater flow are taken to be horizontal saturated hydraulic conductivity, KsatH, horizontal macropore hydraulic conductivity, MacKsatH, and macropore depth, MacD. The soil thickness, another important parameter, is held at an assumed value. Models are run forward from an initial state of completely saturated soil using all meteorological forcings (except precipitation) to capture the steepening effect of ET on the slope of the recession curve. The "observation" stream discharge is taken to be the time-dependent solution to the power law that best fits the observed stream hydrograph. The graphic solution below illustrates how the different parameters impact the shape of the modeled recession curve.




    Notes can be added here.


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