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David Rozman
ResiBil
Hydrologic modeling for
Děčínský Sněžník and Hřensko/Kirnitzsch area
Prague, July 2019

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About BILAN
Infiltration of precipitation and recharge was assessed by hydrologic model BILAN.
developed by T.G. Masaryk Water Research Institute
described in Tallaksen and van Lannen (2004)
further developed during the last decade and it has proven to be a reliable tool in local
conditions (Vizina et al. 2015, Hanel et al. 2012, Horáček et al. 2008)

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About BILAN
Structure of the model is constructed by a system of equations
describing basic principles of water balance. It simulates the
process on the surface, in the soil aeration zone including the effect
of vegetation and in the saturated zone. Air temperature is used as
an indicator of energy conditions, which significantly affect the
water balance components.

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About BILAN
The BILAN model simulates water fluxes and amounts of water
stored in the snow pack, in the unsaturated zone and in the aquifer.

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About BILAN
The simulated flow of water is dependent on six free parameters:
capacity of soil moisture storage
snow melting factor
parameter controlling outflow from direct runoff storage
parameter controlling distribution of percolation into direct runoff and
groundwater recharge under summer conditions
parameter controlling distribution of percolation into direct runoff and
groundwater recharge under snow melting conditions
parameter controlling outflow from groundwater storage
The parameters are calibrated using an optimization algorithm. The optimization
process employs MAPE criterion to find the best fit between the observed and
simulated runoff at the outlet from the catchment.

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Input data
delineation of model catchments
measurement of catchment area
interpolation od meteorological data
transformation to mm/month

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Processing and calibration
The parameters are calibrated using an optimization
algorithm with MAPE (mean absolute percentage
error) criterion to find the best fit between the
observed and simulated runoff at the outlet from the
catchment.

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Output
The gained results are water balance components including potential
and actual evapotranspiration, soil infiltration and recharge of the aquifer.

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Output
The gained results are water balance components including potential
and actual evapotranspiration, soil infiltration and recharge of the aquifer.

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Output

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Output

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Output

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Results
Uncertainties:
shorter calibration period for Cunnersdorferbach and Kamenice
(input data quality?)
in case of Kamenice, the baseflow for calibration was set by classic
hydrograph separation (groundwater flows)
In case of Křinice we are not able to quantify the effect of the part of the
catchment North of the Lausitz thrust
Groundwater model input:
outputs are valid for the model
catchments
time series relevant for the
entire hydraulic model area
are calculated as weighted
average

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Thank You