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A flow forecast system for hydroelectric production
MyWater - Merging hydrological models and EO data for
reliable information on Water
Carina Almeida, Pedro Chambel-Leitao - IST - Portugal
Waldenio Almeida - CPTEC/INPE - Brazil
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Summary
• MyWater Project
• SWAT model watershed implementation: the Queimado case study
• Model flow calibration
• CPTEC Weather forecast
• Precipitation uncertainty and bias removal in Queimado
• Mohid Land aplication in Tamega
• Conclusions
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Page 3
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Study sites, Partners and Users
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SWAT model watershed implementation:
the Queimado case study
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SWAT model implementation
Area: 3900 km2
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SWAT model implementation: Inputs
• Topography Shuttle Radar Topography Mission
• Land Use
• Soil type
• Meteorological data
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SWAT model implementation: Inputs
• Topography
• Land Use Regional map
• Soil type
• Meteorological data
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SWAT model implementation: Inputs
• Topography
• Land Use
• Soil type Joint Research Centre
• Meteorological data
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SWAT model implementation: Inputs
• Topography
• Land Use
• Soil type
• Meteorological data
Data source: ANA (Agência Nacional de Águas)
Barreiro:1985-2008Rio preto:1985-2007Fazenda limeira:1985-2013
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Model flow Calibration
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Model flow calibration
Parameter Default value Final valueGW_Delay (days) 1 300
Alpha_BF 0.048 1
Soil depth (mm) 1000 3000
CN2 -30%CH_N2 0,01 0,15
CH_K2 0 100
Alpha_BNK 0 1
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Model flow calibration
• Queimado – Annual flow: 1985 – 2012 hydrological years
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Model flow calibration• Queimado – Monthly flow: 1985 – 2012
hydrological yearsObservedAverage
Modeled Average Bias RMSE R2
Model Efficiency
49,07 55,31 6,16 18,94 0,71 0,65
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Model flow calibration• Queimado – Daily flow: 1985 – 2012
hydrological yearsObservedAverage
Modeled Average Bias RMSE R2
Model Efficiency
49,15 55,2 6,12 29,09 0,53 0,37
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A flow forecast system for hydroelectric production - Queimado
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CPTEC Weather forecast models
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CPTEC ETA model for MyWater
• For MyWater CPTEC was running ETA model
• 5km horizontal resolution
• CPTEC´s global model for boundary conditions
• Model runs every 12h for 3 day forecasts.
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Monthly Mean Precipitation RMSE
For the 5 test areas, the monthlymean value for the RMSE – The
expected error
July 2012 to June 2013
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Precipitation uncertainty and bias removal
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Precipitation uncertainty• Flow obtained with different precipitation data:
– ANA (data used in calibrated run)
– TRMM (2011-2013 years)
– CPTEC (2013 year)
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Precipitation bias removal
• CPTEC tests
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Mohid Land aplication in Tamega
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Tamega
• Tamega watershed in Portugal using CPTEC model generated good results with 24h forecast and the MM5 24h forecast
Measurments
Mohid-Land with MM5
Mohid-Land with CPTEC
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A flow forecast system for hydroelectric production - Tamega
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Conclusions
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Conclusions• SWAT is useful to predict flows
• In the case of Queimados to apply a bias correction to precipitation is needed to improve SWAT flow results.
• Precipitation from ETA CPTEC/INPE model needs a bias removal of more than 50% to get reasonable forecast flows in Queimado
• For Tamega watershed an average bias removal in the precipitation of 10% would be sufficient (in this case using Mohid Land, but SWAT expected to be similar)
• Modeling results of Queimados an Tamega were shown to the local power production companies and they were interested on the results