unifhycontrib.gr4

class unifhycontrib.gr4.OpenWaterComponent

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 openwater component of the GR4 model comprises the runoff routing using the routing store, and the inter-catchment groundwater exchange.

Contributors

Thibault Hallouin [1,2]

Affiliations

1. Department of Meteorology, University of Reading

2. National Centre for Atmospheric Science

Licence

GPL-2.0

Inwards

name

surface_runoff_flux_delivered_to_rivers

units

kg m^-2 s^-1

from

subsurface

method

mean

Outputs

name

outgoing_water_volume_transport_along_river_channel

units

kg m^-2 s^-1

description

streamflow at outlet

Parameters

name

x2

units

kg m^-2 d^-1

name

x3

units

kg m^-2

Constants

name

gamma

description

routing outflow exponent

units

1

default_value

5.0e+00

name

omega

description

exchange exponent

units

1

default_value

3.5e+00

name

phi

description

partition between routing store and direct flow

units

1

default_value

9.0e-01

States

name

routing_store

units

kg m^-2

SpaceDomain Properties

name

land_sea_mask

required

False

name

flow_direction

required

False

name

cell_area

required

False