wiski open water and ice bernard trevor, m.eng. p.eng. river forecast section environment and...
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WISKIOpen Water and Ice
Bernard Trevor, M.Eng. P.Eng.River Forecast SectionEnvironment and Sustainable Resource Development
WISKI
ESRD Users Conference
10 March 2015
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Outline
• Open water season• Data• Daily Scans• Forecasting Tools
• Ice season• Freeze-up• Breakup• Gauge height versus discharge relationship• Effects on gauge operation
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WISKI – Time Series Data
Generally we are looking at the following time series
O. = original data (direct form Collect or logger input, not editable)
V. = validated data (where WISKI validators / correctors are applied)
P. = production data (where data can be manually edited)
C. = computed data (e.g., corrected water levels; flows; etc.)
A. = aggregated data (i.e., hourly, daily, weekly, monthly, yearly)
S. = statistics (e.g., percentiles, historical means, percent normal, etc.)
F. = model flow results AND flows converted to water level (flows are written into database by the model, database computes water levels)
X. = water level thresholds
Techs
Forecaster General
Forecaster Events
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Forecasting Daily DutiesDaily Scan – Reports
WISKI Reports
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Forecasting Daily DutiesDaily Scan – Dashboard
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Forecasting Models
• Forecast 146 locations in the province
• Pull 15 min data from WISKI• Run on an hourly time step• Route inflow through
reservoirs• Write flow back into WISKI to
back compute field water levels (removes gauge corrections)
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Forecasting Water Supply Tools
Snow Survey and Ranking Reports
Snow/Precip Summary for Water Supply Regression Models
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Flood Notification Update
Flood Frequency Work and Advanced Graphing
• Using advanced graphing to pull Annual Max Daily Q daily from A. DayMean-NRT as WSC data set on datamart not complete
• Using Flood Frequency analysis of extreme events to generate freq analysis for ops room use only
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WISKI Flood Notification Update
SKED and Rating Curves• Updating FNM rating curve
tables
• Assessing the changing capacity of the rivers over time (ie Oldman at Lethbridge is gradually losing capacity)
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Ice Season
•Alberta is a cold climate•Edmonton
•Average <0°C Nov. to Mar.•Daily Minimum <0°C Oct. to Apr.•Recorded Minimum <0°C All months
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Ice Season
•Varies by•North to south•Mountains to prairies•Higher to lower elevations•Smaller stream to larger streams
•Ice affects gauge height•Ice affects equipment•Causes flooding
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Ice Season
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Ice season
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Ice Season
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Freeze-up Break up
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Ice Cover Progression
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Alarms
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Alarms
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Daily Status Email for 172 ice, open water and rainfall intensity alarms
Alarms goto duty phones via duty emails
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Remote Camera
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Gauge Height vs. Discharge Relationship
•Ice affects gauge height•Discharge relationship not valid with ice•Ice changes•Hydraulic smoothing•Ice production takes water out (into storage)•Ice melting releases water (out of storage)
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Gauge Height vs. Discharge Relationship
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Gauge Operation
•Ice affects equipment•Orifice blockages•Orifice movements
•Leaks
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Gauge Operation - Blockage
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Gauge Operation – Orifice movement
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Gauge Operation – Temperature effects, Leaks
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