A new simple conceptual model similar to the original HBV model has been implemented. The Switch HBV Soil model (Model structure group) make it possible to run the new model as complementary to the ordinary Richards equation type of soil that is used in the CoupModel. The new switch may also exclude the use of the Richards equation model Note that the model can use any time resolution but it works on the resolution that is specified by the input file time resolution. Normally daily values can be used and only 1 iteration per day is required to get rapid calculations of the runoff using this module.
The module is defined from 1 soil storage and 2 ground water storage.
Note that the HBV model can be used with snow and various evapotranspiration models but with some restrictions if the Richards equation and the soil heat equations are excluded from the CoupModel. For example in such a case no separate soil evaporation will be calculated. The heat storage will not have any interactions on the evaporation calculations and not either on the snow melt.
The follow variables are added:
State Variables:
Base GW Storage
Peak GW Storage
Soil Storage
Flow Variables
Base Flow
HBV Evap
HBV GW Redist
HBV Input GW
HBV Input SOIL
HBV RunOff
HBV_Input
Peak Flow
Parameters:
BetaCoef
Critical Uptake Frac
Discharge Alfa
Discharge K1
Discharge K2
Field Capacity
Initial Base Storage
Initial Peak Storage
Initial Soil Storage
PMaxPerc