GLOFAS(eng) - Revision history

Admin at 14:04, 4 August 2022

2022-08-04T14:04:54Z

Admin at 10:03, 9 July 2020

2020-07-09T10:03:54Z

Admin at 22:30, 16 November 2018

2018-11-16T22:30:27Z

Admin at 22:30, 16 November 2018

2018-11-16T22:30:01Z

Admin: Created page with " [Home] - [Forecast Models] {| class="wikitable" |- |style="background-color: orange;" |Layer name |style="background-color: orange;"|G..."

2018-11-16T22:29:31Z

Created page with " [Home] - [Forecast Models] {| class="wikitable" |- |style="background-color: orange;" |Layer name |style="background-color: orange;"|G..."

New page

[[User Guide | [Home]]] - [[Forecast Models | [Forecast Models]]]

{| class="wikitable"
|-
|style="background-color: orange;" |Layer name
|style="background-color: orange;"|GLOFAS Alert Probability
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|Tag
|Hydrological Models
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|Folder
|
|-
|Source
|[http://www.globalfloods.eu/ Global Flood Awareness System]
|-
|Description
|GloFAS 30-day v2.0 technical settings
GloFAS 30-day v2.0 uses the Lisflood river routing model (van der Knijff et al., 2010) to propagate along the river channel the surface and sub-surface runoff forecasts of the HTESSEL land surface model (Balsamo et al., 2009) of the ECMWF ENS medium- and extended-range forecasting system to produce daily discharge forecasts. In GloFAS 30-day v2.0, Lisflood was calibrated for better accounting for the variability in the hydrological processes (Hirpa et. al., 2018). More details can be found in the Lisflood calibration page.
ECMWF-ENS is the ensemble forecast of ECMWF and consists of 51 members at ~ 18 km resolution up to 15 days, increasing to ~36 km from day 16 to 30. ECMWF ENS runoff forecasts are resampled to 0.1 spatial resolution (~10 km) before being used as daily input to Lisflood to produce discharge up to day 15; from day 16 the latest available extended range forecast is used as forcing to produce seamless discharge forecasts for 30 days.
GloFAS 30-day v2.0 initial conditions (atmosphere and land surface states from which to start the ensemble discharge forecast) are based on a 5-day monitoring analysis of the latest proxy-observations, the ERA5 ECMWF reanalysis. Because of ERA5’s has a ~2 days latency (compared with real time), ERA5 is used only as long as it is available; for the remaining 2 to 3 days, prior to the GloFAS 30-day forecast, the day-1 of ECMWF-ENS-CNTL forecast is taken as input.

More info at: [http://www.globalfloods.eu/technical-information/glofas-30V2day/ GLOFAS documentation on line]

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|Screenshot
|[[File:all_glofas.JPG|1000px|thumb|centre|]]
|[[File:all_leg_glofas.JPG|800px|thumb|centre|Legend]]
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|style="background-color: grey;"| Properties
|style="background-color: grey;"|
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|Available variables
|Expected flood (return period = 1, 2, 5, 20, 20+ years)
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|Available accumulations
|
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|Available interpolation algorithms
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|Available filters
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|Spatial aggregations
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|}

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[[User Guide | [Home]]] - [[Forecast Models | [Forecast Models]]]

← Older revision		Revision as of 14:04, 4 August 2022
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	More info at: [http://www.globalfloods.eu/technical-information/glofas-30V2day/ GLOFAS documentation on line]		More info at: [http://www.globalfloods.eu/technical-information/glofas-30V2day/ GLOFAS documentation on line]

−	'''AVERTISSEMENT : Pour être autorisé à visualiser cette couche, les utilisateurs doivent accepter les conditions d'utilisation avec le propriétaire des données (veuillez consulter la section "Source" de cette page)'''

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 More info at: [http://www.globalfloods.eu/technical-information/glofas-30V2day/ GLOFAS documentation on line]
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 |Available variables
-|Expected flood (return period = 5, 20 years)
+|Inondation prévue (période de retour = 5, 20 ans)
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 |Available accumulations

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 |-
 |Description
-|GloFAS 30-day v2.0 technical settings
+|GloFAS 30-day v2.0 uses the Lisflood river routing model (van der Knijff et al., 2010) to propagate along the river channel the surface and sub-surface runoff forecasts of the HTESSEL land surface model (Balsamo et al., 2009) of the ECMWF ENS medium- and extended-range forecasting system to produce daily discharge forecasts. In GloFAS 30-day v2.0, Lisflood was calibrated for better accounting for the variability in the hydrological processes (Hirpa et. al., 2018). More details can be found in the Lisflood calibration page.
 ECMWF-ENS is the ensemble forecast of ECMWF and consists of 51 members at ~ 18 km resolution up to 15 days, increasing to ~36 km from day 16 to 30. ECMWF ENS runoff forecasts are resampled to 0.1 spatial resolution (~10 km) before being used as daily input to Lisflood to produce discharge up to day 15; from day 16 the latest available extended range forecast is used as forcing to produce seamless discharge forecasts for 30 days.
 GloFAS 30-day v2.0 initial conditions (atmosphere and land surface states from which to start the ensemble discharge forecast) are based on a 5-day monitoring analysis of the latest proxy-observations, the ERA5 ECMWF reanalysis. Because of ERA5’s has a ~2 days latency (compared with real time), ERA5 is used only as long as it is available; for the remaining 2 to 3 days, prior to the GloFAS 30-day forecast, the day-1 of ECMWF-ENS-CNTL forecast is taken as input.