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The hydrological forecasting platform GEM-Hydro
within the GWF project
V. Vionnet1,2, V. Fortin2 and M. Dimitrijevic2
1 Centre for Hydrology, University of Saskatchewan, Canada2Meteorological Research Division, Environment and Climate Change Canada
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Outline
• GEM-Hydro: a forecasting system based on coupled numerical models for water cycle prediction
• Example: Great Lakes and St. Lawrence watershed
• GEM-Hydro for GWF
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GEM NWP system
• Global 25-km 240-h forecasting system
• North American 10-km 48-h forecasting system
• Canadian 2.5-km48-h forecasting system
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Atmosphericmodel: GEM
Water-surface model
Land-surfacemodelGEM-Surf
GEM-based
surface prediction system
Precip.
Evap.ISBAorSVS
offline mode
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Atmosphericmodel: GEM
Water-surface model
Land-surfacemodel
Routingmodel
GEM-
Hydro
GEM-based
hydrological prediction system
Precip.
Evap.
Runoff
ISBAorSVS
offline mode
WATROUTE
Gaborit et al. (2017, HESS, Accepted); Durnford et al. (2017, BAMS, Accepted)
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Advantages of using coupled
environmental models
• Accuracy and consistency gains:
– Effects of interactions between the atmosphere and the surface (lakes, land, …)
– Evaporation and evapotranspiration are the same in the atmosphere, hydrology and lake models
• Efficiency gains:
– Latency: environmental predictions are available at the sametime as the weather forecast
– Robustness: 24/7 support at almost no additional cost– Maintenance: a single land-surface model to maintain
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WATROUTE
routing model (1km)
GEM LAM (10 km)
atmospheric model
(ISBA land-surface scheme)
NEMO+CICE (2 km)
ocean-ice model
GEM RDPS (10 km)
atmospheric model
NEMO+CICE (2 km)
ocean-ice model
over the Great Lakes
Data assimilation
system (EnVAR)
Water Cycle Prediction System for
the Great Lakes and St. Lawrence
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WATROUTE
routing model (1km)
GEM LAM (10 km)
atmospheric model
(ISBA land-surface scheme)
NEMO+CICE (2 km)
ocean-ice model
over the Great Lakes
In production since
June 2016:
• 2 runs per day
• 3.5 day forecasts
Water Cycle Prediction System for
the Great Lakes and St. Lawrence
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Streamflow analysis cycle2017-06-22 06Z - 2017-06-24 06Z
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Streamflow analysis cycle2017-06-22 06Z - 2017-06-26 06Z
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GEM-Hydro within GWF
• GEM-Hydro over Southern Alberta
• Region strongly impacted by the June 2013 flood
• Many challenges for hydrology including upstream mountainous region
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Operational configuration
• 1-km grid spacing domain covering South Alberta
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Operational configuration
• 1-km grid spacing domain covering South Alberta
• Includes South-Saskatchewan river watershed
• Runs:– Coupled: GEM 1km
(-> 48h)– Offline: Ensemble
(REPS) 10->1 km (-> 96h)
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Experimental configuration
• 1-km grid spacing domain covering South Alberta
• 250-m grid spacing domain covering the Bow river
watershed
• Focus on mountain
hydrology1-km domain
250-m domain
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Experimental configuration
• 1-km grid spacing domain covering South Alberta
• 250-m grid spacing domain covering the Bow river
watershed
• Runs:– Coupled: GEM 250
m (-> 24h)– Offline: GEM 1->
0.25 km (-> 48h)
250-m domain
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Experimental configuration
A configuration to tackle major challenges in mountain
hydrology:
• Precipitation: – Spatial variability and phase change: GEM 1km, 250 m – Precipitation analysis in mountainous terrain: CaPA 1km
• Snowpack: – Model complexity (single- and multi-layer schemes in SVS)– Subgrid spatial variability (coll. Coldwater Lab.)– Data assimilation (SWE, SCA, …)
• 1st test : Rain on Snow Event during the June 2013 flood
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Thank you for your attention!
Questions?