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Published byCecily Goodwin Modified over 9 years ago
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Validation of the new B2B Bankless Channel Irrigation System model
Michael Grabham, R. Soppe, J. Hornbuckle, R. Smith and S. Raine
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Outline System overview Hydraulic challenges B2B model
Bay-scale comparison Whole field simulations Conclusions
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System Overview
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System overview
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System overview
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Why the system is being considered
Advantages Labour savings Can be automated Machine efficiency Expanded cropping options
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Hydraulic challenges
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Hydraulic challenges Variable inflow rates Variable bay sizes
Bay to bay hydraulic interaction
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Hydraulic challenges Variable inflow rates
Volume balance approach used to determine surface storage and infiltrated volume Variable discharge complicates calculations
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Hydraulic challenges Flow rate Time
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Hydraulic challenges Variable bay sizes 60:100:40 bay ratios
Surface storage volume accumulation Interconnecting pipe size selection Drainage water minimisation
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Hydraulic challenges
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Hydraulic challenges
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Hydraulic challenges Bay to bay hydraulic interaction
Calculate the available volumes Calculate inflow rates Select adequate bay dimensions Select adequate pipe sizes
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B2B model
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B2B model Current simulation models Single dimension Variable inflow
Recession phase limitations Assume free flowing drainage
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B2B model Clemmens’ (2007) surface irrigation design approach
Volume balance principles Spreadsheet based Simultaneously solves for advance and inlet depth Uses fixed inflow
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B2B model Darcy Weisbach equation
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Darcy Weisbach equation
B2B model Clemmens’ Approach Darcy Weisbach equation
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B2B model Model features Infiltration parameters
Bay or furrow inflow rates Manning n selection σy pre-defined Level furrow or bankless accommodated Target infiltration depth Up to nine bays can be simulated Several irrigation termination options Completion of advance After set delay After target infiltration depth achieved
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Bay scale comparison
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B2B – Bay Scale Discharge Errors from Measured winSRFR = 65%
SISCO = 65% B2B = 18%
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B2B – Bay Scale Advance and recession
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B2B – Bay Scale Infiltrated depth
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B2B – Bay Scale Simulation discrepancies
Attributed to model assumptions Level water surface Friction ignored Infiltration during recession
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Field simulations
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B2B – Field Scale Advance and recession Bay 1 Bay 3 Bay 2
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B2B – Field Scale Depth
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B2B – Field Scale Inlet hydrographs
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B2B – Field Scale Inlet cumulative hydrographs
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Conclusions Novel approach taking into account bay-to-bay interaction
Enables simulation of multiple bay systems Discrepancies with known causes
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Acknowledgements CRC IF Postgraduate scholarship
IAL and CRC IF Travel Fund grant CSIRO Land and Water, Griffith USQ, Toowoomba
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Acknowledgements
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