1 / 31

Validation of the new B2B Bankless Channel Irrigation System model

Validation of the new B2B Bankless Channel Irrigation System model. Michael Grabham , R. Soppe, J. Hornbuckle, R. Smith and S. Raine. Outline. System overview Hydraulic challenges B2B model Bay-scale comparison Whole field simulations Conclusions. System Overview. System overview.

eytan
Download Presentation

Validation of the new B2B Bankless Channel Irrigation System model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Validation of the new B2B Bankless Channel Irrigation System model Michael Grabham, R. Soppe, J. Hornbuckle, R. Smith and S. Raine

  2. Outline • System overview • Hydraulic challenges • B2B model • Bay-scale comparison • Whole field simulations • Conclusions

  3. System Overview

  4. System overview

  5. System overview

  6. Why the system is being considered • Advantages • Labour savings • Can be automated • Machine efficiency • Expanded cropping options

  7. Hydraulic challenges

  8. Hydraulic challenges • Variable inflow rates • Variable bay sizes • Bay to bay hydraulic interaction

  9. Hydraulic challenges Flow rate Time

  10. Hydraulic challenges • Variable bay sizes • 60:100:40 bay ratios • Surface storage volume accumulation • Interconnecting pipe size selection • Drainage water minimisation

  11. Hydraulic challenges

  12. Hydraulic challenges

  13. Hydraulic challenges • Bay to bay hydraulic interaction • Calculate the available volumes • Calculate inflow rates • Select adequate bay dimensions • Select adequate pipe sizes

  14. B2B model

  15. B2B model • Current simulation models • Single dimension • Variable inflow • Recession phase limitations • Assume free flowing drainage

  16. B2B model • Clemmens’ (2007) surface irrigation design approach • Volume balance principles • Spreadsheet based • Simultaneously solves for advance and inlet depth • Uses fixed inflow

  17. B2B model • Darcy Weisbach equation

  18. Clemmens’ Approach Clemmens’ Approach B2B model Darcy Weisbach equation

  19. Bay scale comparison

  20. B2B – Bay Scale • Discharge Errors from Measured winSRFR = 65% SISCO = 65% B2B = 18%

  21. B2B – Bay Scale • Advance and recession

  22. B2B – Bay Scale • Infiltrated depth

  23. B2B – Bay Scale • Simulation discrepancies • Attributed to model assumptions • Level water surface • Friction ignored • Infiltration during recession

  24. Field simulations

  25. B2B – Field Scale • Advance and recession Bay 1 Bay 3 Bay 2

  26. B2B – Field Scale • Depth

  27. B2B – Field Scale • Inlet hydrographs

  28. B2B – Field Scale • Inlet cumulative hydrographs

  29. Conclusions • Novel approach taking into account bay-to-bay interaction • Enables simulation of multiple bay systems • Discrepancies with known causes

  30. Acknowledgements • CRC IF Postgraduate scholarship • IAL and CRC IF Travel Fund grant • CSIRO Land and Water, Griffith • USQ, Toowoomba

  31. Acknowledgements

More Related