unifhycontrib.gr4
- class unifhycontrib.gr4.SubSurfaceComponent
The GR4 (“Génie Rural à 4 paramètres” [in French]) model is a bucket-type rainfall-runoff model featuring four parameters.
It is typically used as a daily model, i.e. GR4J model (Perrin et al., 2003). It can also be used at other temporal resolutions, e.g. hourly in GR4H model, provided an adjustment in its time-dependent parameter and constant values is performed (Ficchì et al., 2016). The model has recently been expressed in a state-space formulation (Santos et al., 2018).
This version of the GR4 model is based on its explicit state-space formulation and its recommended temporal resolutions are daily or hourly. With either of these resolutions, time-dependent parameters x2, x3, x4, and constant nu are expected for the daily case and they are adjusted accordingly if temporal resolution is not daily.
The subsurface component of the GR4 model comprises the runoff generation and the runoff routing using the Nash cascade.
- Contributors
Thibault Hallouin [1,2]
- Affiliations
Department of Meteorology, University of Reading
National Centre for Atmospheric Science
- Licence
GPL-2.0
- Codebase
Inwards
- name
canopy_liquid_throughfall_and_snow_melt_flux
- units
kg m-2 s-1
- from
surfacelayer
- method
mean
- name
transpiration_flux_from_root_uptake
- units
kg m-2 s-1
- from
surfacelayer
- method
mean
Outwards
- name
soil_water_stress_for_transpiration
- units
1
- to
surfacelayer
- method
mean
- name
surface_runoff_flux_delivered_to_rivers
- units
kg m-2 s-1
- to
openwater
- method
mean
Parameters
- name
x1
- units
kg m-2
- name
x4
- units
d
Constants
- name
alpha
- description
production precipitation exponent
- units
1
- default_value
2.0e+00
- name
beta
- description
percolation exponent
- units
1
- default_value
5.0e+00
- name
nu
- description
percolation coefficient
- units
1
- default_value
4.444444444444444e-01
- name
nres
- description
number of stores in Nash cascade
- units
1
- default_value
1.1e+01
States
- name
production_store
- units
kg m-2
- name
nash_cascade_stores
- description
stores in Nash cascade
- units
kg m-2
- divisions
nres
SpaceDomain Properties
- name
land_sea_mask
- required
False
- name
flow_direction
- required
False
- name
cell_area
- required
False