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The blending steps modifier is a modifier which can only be used in combination with the transformation AdjustQ.
Secondly adjustQ-transformation should use a moduleparameterfile to define its parameters to be able to use this modifier.
This transformation uses observed discharges and simulated discharges to create an output timeseries.
One of the parameters of the adjustQ-transformation is the blending steps.
This parameter determines in how many steps the blend from the observed time series to the simulated time series is done.
The blending steps modifier is used to modify this parameter. The modifier doesn't have a start- and/or endtime and is always valid.
The last applied blending steps modifier is always applied. Only one blending steps modifier can be defined in a fews configuration.
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The transformation adjustQ creates a discharge time series by using observed discharge time series and simulated observed
discharge time series. When this modifier is applied the observed time series are ignored and the output will be equal to the
simulated discharge time series. This modifier can, like the blending steps modifier, only be used in combination with the
adjustQ-modifier.
Typical use of this modifier is espadjq which is used by the NWS to disable the adjustQ-operation in the forecast.
Display
schema
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Secondly adjustQ-transformation should use a moduleparameterfile to define its parameters to be able to use this modifier.
The moduleparameterfile should define the (optional) parameter disableAdjustment.
Below an example
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<parameters xmlns="http://www.wldelft.nl/fews/PI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.5" xsi:schemaLocation="http://www.wldelft.nl/fews/PI http://chps1/schemas/pi-schemas/pi_modelparameters.xsd">
<group id="default">
<parameter id="blendingSteps">
<intValue>1</intValue>
</parameter>
<parameter id="interpolationType">
<stringValue>difference</stringValue>
</parameter>
*<parameter id="disableAdjustment">
<boolValue>false</boolValue>
</parameter>*
</group>
</parameters>
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Typical use of this modifier is espadjq which is used by the NWS to disable the adjustQ-operation in the forecast.
Display
Below an example of the display for this modifier. The forecaster cannot select a start- and/or enddate. This means that if this modifier
is active the adjustQ-operation is disabled.
schema
Below the schema of the disableAdjustmentModifier.
Configuration example
The configurator only has to configure the id and the name of the modifier. By doing this FEWS knows that it is allowed
to use this modifier at a each adjustQ-operation which uses a moduleparameterfile and has the tag disableAdjustment in its
moduleparameterfile defined.
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<adjustQModifiers>
<blendingStepsModifier id="chgblend" name="CHGBLEND"/>
<disableAdjustmentModifier id="espadjq" name="ESPADJQ"/>
</adjustQModifiers>
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Sample years modifier
The transformation sample historic creates ensembles based on historic time series. This modifier enables the forecaster to change the start year and the end year of the historic time series to sample.
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